taxonID	type	description	language	source
03F12042FFE78A400599FC27FA0890CE.taxon	materials_examined	[Holotype: USNM; ♂ Riverside, California, US; April 25, 1930]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFE78A400599FC27FA0890CE.taxon	discussion	This species of Ancylandrena was previously reported as the sole representative in the BCP by Ayala et al. (1996). It inhabits the Coastal Sage Matorral, Succulent Coastal Sage and Chaparral ecoregions. Two females are reported from Sierra San Pedro Mártir in May 1958 (EMEC) and a third one in Ensenada in April 1941 (USNM) in the generic revision by Zavortink (1974). The BBPT collected one male in April 2021 and six females in April 2022 from Valle de Guadalupe, six females and three males from Sierra San Pedro Mártir, and one female and male from the transition zone between the Succulent Coastal Sage and the Central Desert in April 2023 (MABC). See fig. 6.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFE78A400599FAE3FA0291E6.taxon	materials_examined	[Holotype: USNM (28559); ♀ Panamint Valley, Inyo County, California, US; April 1891]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFE78A400599FAE3FA0291E6.taxon	discussion	Ancylandrena larreae is a xeric species and a pollen specialist on Creosote-bush (Larrea tridentata (DC.) Coville) (Hurd & Linsley 1975). We examined one male collected in Bahia de los Ángeles April 1973 (EMEC). Additionally, three females were collected from the southern region of Vizcaíno Desert in March of 2021 (MABC). See fig. 6.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFE78A400599FA1BFBAB9322.taxon	materials_examined	[Holotype: CASC; ♂ 914 – 1036 mts, Spring Mountains, 20.9 km NW. of Las Vegas, Clark County, Nevada, US; May 11, 1969]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFE78A400599FA1BFBAB9322.taxon	discussion	Ancylandrena timberlakei has been documented in California and both peninsular states. We examined one specimen from the Lower Colorado Desert from April 1973 (EMEC). For the BCP states there are only publicly accessible records from BC. In this project’s fieldwork, one female specimen was collected in the Baja California Mountains of Sierra Juárez in May 2022, and eight males and three females were collected in the transition zone between the Succulent Coastal Sage and the Central Desert in April 2023 (MABC). See fig. 6.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF88A5F0599F8D2FBBE93D2.taxon	materials_examined	[Holotype: UCRC; ♀ Palm Springs, California, US; March 9, 1924]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF88A5F0599F8D2FBBE93D2.taxon	discussion	LaBerge (1985) first reported this species in BCP in Valle de la Trinidad in Chaparral habitat. This species is a pollen specialist on Phacelia Juss. (LaBerge 1985). Specimens from the Lower Colorado Desert and Central Desert collected in March 2014 (5 ♀) are preserved at the CNIN. The BBPT collected this species at various locations within the Central Desert (BC) and the Vizcaíno Desert (BCS) (MABC). See fig. 7.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF98A5E0599F911FB5993DC.taxon	materials_examined	[Holotype: USNM (59273); ♀ Riverside, California, US; October 13, 1928]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF98A5E0599F911FB5993DC.taxon	discussion	Andrena isocomae is a new species record in Mexico and BCP. This species flies later in the summer months and specializes on pollen from plants in the family Asteraceae including Gutierrezia Lag., Isocoma Nutt., and Heterotheca Cass. (LaBerge 1967). One female was collected in El Condor, a locality near the border with California in 1981 (SDNHM) and it has been recorded in recent surveys in San Diego County near the border (Hung et al. 2015). The BBPT collected 11 females in the Baja California Mountains (2021), Chaparral (2019), and the Central Desert (2020). All specimens were collected between August and November (MABC). See fig. 7.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFA8A5D0599FF63FAA79566.taxon	materials_examined	[Lectotype: CASC; ♀ El Taste, Baja California Sur, Mexico]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFA8A5D0599FF63FAA79566.taxon	discussion	Andrena manifesta is the type species of the subgenus Callandrena Cockerell, 1989. This species was first reported by Ayala et al. (1996) in BCS. Historical records indicate its presence in the Gulf Coast as well as in the Cape Mountains ecoregions. Voucher specimens of this species are at INHS, SEMC, and SDNHM. See fig. 7.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFA8A5C0599F872FEFC953A.taxon	materials_examined	[Holotype: CASC; ♂ Cypress Ridge, Marin Co., California, USA; April 6, 1921]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFA8A5C0599F872FEFC953A.taxon	discussion	This species is found in the CFP and is an early-flying spring species that specializes on pollen from Arctostaphylos Adans. (Ribble 1967). There is a historical record from the Coastal Sage Matorral collected at 19.1 mi. south of Ensenada (Ribble 1968). The BBPT collected 12 specimens (6 ♀, 6 ♂) in the Chaparral at Rancho Ojai in March 2016, one female from Piedras Gordas in May 2021, and one male from Rancho Concepción in April 2023 (MABC; ECOAB). See fig. 8.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFB8A5C0599FEBFFE5C95F6.taxon	materials_examined	[Holotype: CASC; ♀ Westley, Stanislaus Co., California, USA; April 1, 1948]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFB8A5C0599FEBFFE5C95F6.taxon	discussion	This species has been reported in the literature to BC in the Coastal Sage Matorral north of Ensenada (Ribble 1968; Ayala et al. 1996). See fig. 8.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FF14FCA59589.taxon	materials_examined	[Holotype: CASC; ♀ Chuchupate Ranger Station, base Frazier Mtn., Ventura Co., California, US; May 2, 1959]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FF14FCA59589.taxon	discussion	Andrena agoseridis is a specialist on pollen from plants in the family Asteraceae including Agoseris Raf. and Anisocoma Torr. and A. Gray (Thorp 1969). This species represents a new species record for both Mexico and the BCP. We confirmed the identification of a single specimen from the CNIN collection, collected in March 2014 from the Baja California Mountains in La Rumorosa. See fig. 9.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FE28FCC2968D.taxon	materials_examined	[Holotype: CASC; ♀ 11.25 km east of Temecula, Riverside County, California, US; April 23, 1959]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FE28FCC2968D.taxon	discussion	The presence of Andrena anatolis was documented by Ayala et al. (1996) and has been observed in BC, specifically within the CFP, inhabiting the Coastal Sage Matorral and Succulent Coastal Matorral ecoregions. This species specializes on pollen from suncups in the genus Camissonia Link (Thorp 1969). We reviewed five females collected in Coastal Sage Matorral in March 1962 (EMEC). See fig. 9.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FD2CFD8897A6.taxon	materials_examined	[Holotype: UCRC; ♀ Claremont, Los Angeles, California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FD2CFD8897A6.taxon	discussion	Andrena cyanosoma inhabits the CFP in California, USA and BC, Mexico. This species specializes on pollen from suncups in the genus Camissonia Link (Thorp 1969). Within BC, this species was reported by Hurd (1979) and confirmed by Ayala et al. (1996).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FC44FE7C907D.taxon	materials_examined	[Holotype: ♂ Avalon, Catalina Island, Los Angeles Co., California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FC44FE7C907D.taxon	discussion	Andrena gnaphalii flies early in the morning and collects pollen only from Agoseris Raf. (Thorp 1969). We collected the first specimen of Andrena gnaphalii recorded in Mexico. The specimen (1 ♀) was collected in April 2021 in the Chaparral (MABC). See fig. 10.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FB7CFB919116.taxon	materials_examined	[Holotype: CASC; ♀ Simmler, 16.1 km W., San Luis Obispo Co., California, US; May 5, 1962]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FB7CFB919116.taxon	discussion	As the name suggests, Andrena malacothricidis specializes on pollen primarily from Malocothrix DC. in the family Asteraceae (Thorp 1969). This species inhabits the CFP in California, USA and BC, Mexico. Within BC, this species was first reported by Hurd (1979) and confirmed by Ayala et al. (1996).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FA94FD809209.taxon	materials_examined	[Holotype: ANSP; ♀ Southern California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599FA94FD809209.taxon	discussion	Andrena parachalybea specializes on pollen from suncups in the genus Camissonia Link (Thorp 1969). This species was previously reported by Ayala et al. (1996) in BC. We reviewed three females from the Coastal Sage Matorral, collected in March 1962 (EMEC). Additionally, we examined a female collected by the MABC team in May 2021 in Chaparral habitat. See fig. 10.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599F9A8FD9C9355.taxon	materials_examined	[Holotype: ANSP; ♂ (labeled as female) Pasadena, Los Angeles Co., California, US; April 8. 1909]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFC8A5B0599F9A8FD9C9355.taxon	discussion	Andrena puthua flies in the morning and early afternoon and specializes on pollen from plants in the genus Lasthenia Cass. (Thorp 1969). This species occurs in California, USA and BC, Mexico. We examined 19 specimens collected in March 2014 at the Baja California Mountains vouchered at the CNIN (12 ♀, 7 ♂), and one collected in April 1988 at SDNHM (1 ♀). Three females were collected as part of this project, two in March 2021, one in the Succulent Coastal Matorral, and the other in the Central Desert and another in Coastal Sage Matorral in Valle de Guadalupe in May 2021 (MABC). See fig. 11.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFD8A5A0599F96EFE9693AA.taxon	description	[Holotype: ANSP (4024); ♀ Southern California, US, 1880]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFD8A5A0599F96EFE9693AA.taxon	discussion	Andrena subchalybea specializes on pollen from Agoseris Raf. and Lasthenia Cass. (Thorp 1969). This species has been reported in BC state (Ayala et al. 1996). There is one record of A. subchalybea collected in April 1961 from Chaparral area near the boundary with the Lower Colorado Desert. The specimen is vouchered at INHS (GBIF 2023). We reviewed nine females collected in April 1939 in the Succulent Coastal Sage in Rosarito Beach (CASC). See fig. 11.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFE8A590598F916FD4B9396.taxon	materials_examined	[Holotype: INHS; ♀ Buck Meadows-Mather area, Tuolomne Co., California, US; March 28, 1971]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFE8A590598F916FD4B9396.taxon	discussion	Andrena principalis is the type species for the subgenus Erandrena and specializes on pollen from Arctostaphylos Adanson (LaBerge 1985). This species was previously reported in the Coastal Sage Matorral in Ensenada, 19 mi. S. in February 1946, BC (LaBerge 1986). The MABC team collected an additional specimen of this species (1 ♀) in Valle de Guadalupe in February 2018. See fig. 12.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFF8A580599FF14FE4B95AD.taxon	materials_examined	[Holotype: AMNH; ♀ Live Oak Canyon, near Redlands, San Bernardino Co., California, US; March 30, 1936]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFFF8A580599FF14FE4B95AD.taxon	discussion	Ribble (1974) reported this species in BC in the Coastal Sage Matorral south of Ensenada City. In this project the BBPT collected three additional females in March and April 2021 in the same habitat from a nearby locality (Ejido A. Melendrez). See fig. 12.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF08A570599FF14FB919589.taxon	materials_examined	[Holotype: CASC; ♂ Rancho Escondido, California, US; March 31]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF08A570599FF14FB919589.taxon	discussion	This species is a pollen specialist on plants in the family Asteraceae Layia Hook. & Arn. ex. DC. LaBerge and Thorp (2005). Within the BCP, Andrena escondida occurs in BC in the Coastal Sage Matorral and Central Desert habitats. Historical records of A. escondida were first recorded in April 1941 and 1946 (UCRC). We collected two females in El Descanso locality in the Central Desert in March 2021 (MABC). See fig. 12.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560599FEB8FD9C9619.taxon	materials_examined	[Holotype: USNM (3398); ♂ Mr. Boyle’s garden, Santa Fé, Nuevo Mexico, US; July 4, 1895]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560599FEB8FD9C9619.taxon	discussion	Andrena cerasifolii is one of the most abundant Andrena species in the BCP. LaBerge (1986) reported this species in the Coastal Sage Matorral, Succulent Coastal Matorral, and Baja California Mountains in BC. We examined one female from the Lower Colorado Desert in March 2005 (MABC). Additionally, the BBPT collected four specimens in the Succulent Coastal Matorral in January 2020 and one male in the Coastal Sage Matorral in May 2022 (2 ♀ MABC; 2 ♀ ECOAB). See fig. 13.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560599FD98FF399779.taxon	materials_examined	[Holotype: USNM; ♀ San Bernardino Co., California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560599FD98FF399779.taxon	discussion	Andrena cryptanthae is named for the plant for which it specializes on the pollen from, Cryptantha Lehm. ex. G. Don. (Thorp 1987). This species has been historically collected in the Coastal Sage Matorral and in the Baja California Mountains at Sierra San Pedro Mártir, BC (LaBerge 1986). The BBPT collected five females and two males in Chaparral habitat at Rancho La Concepción in Sierra San Pedro Mártir in April 2023 (MABC). See fig. 13.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560598FC78FB499035.taxon	materials_examined	[Holotype: UCRC; ♀ Ensenada, Baja California, Mexico; April 24, 1941]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560598FC78FB499035.taxon	discussion	The holotype female of Andrena layiae is from Ensenada, BC. We examined one male reported by Bouseman & LaBerge (1970) from the Succulent Coastal Sage collected in March 1960 (EMEC). See fig. 13.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A5605F9FF63FC949539.taxon	description	This subgenus is well represented in BC with five species. We recognize the former subgenera Scoliandrena and Tylandrena under Melandrena as in Pisanty et al. (2022).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560598FBB4FDA890CD.taxon	materials_examined	[Holotype: CASC; ♀ Los Angeles, California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560598FBB4FDA890CD.taxon	discussion	This species inhabits the Coastal Sage Matorral in BC and has been reported near Ensenada city (Bouseman & LaBerge 1978). During this project, one female was collected in April 2021 in the Coastal Sage Matorral in Ejido A. Melendrez (MABC). See fig. 14.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560598FAECFCD4922D.taxon	materials_examined	[Holotype: ANSP; ♀ Southern California, US; 1880]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560598FAECFCD4922D.taxon	discussion	This species was previously reported in the Coastal Sage Matorral and the Chaparral ecoregions of BC (Bouseman & LaBerge 1978). We confirmed three specimens reported by Bouseman & W. LaBerge (1978), collected in La Zapopita, Valle de La Trinidad (Chaparral) in March, 1961. Additionally, The BBPT collected two females in the Central Desert in March 2021, and one female in April 2021 in the Baja California Mountains. Voucher specimens are in the BBSL, MABC, and ECOAB collections. See fig. 14.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560599F950FBBB930D.taxon	materials_examined	[Holotype: CASC; ♀ Llano (10 mi. E.), California, US; March 27, 1935]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A560599F950FBBB930D.taxon	discussion	This species inhabits California, USA and BC, Mexico (Ribble 1968). One male collected in April 1961 was reported by Ribble (1968) in Chaparral in La Zapopita Valle de la Trinidad, BC. See fig. 15.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A5505F9F8ACFB3E953A.taxon	materials_examined	[Holotype: UNSM; ♀ Pullman, Washington, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF18A5505F9F8ACFB3E953A.taxon	discussion	This species has a broad distribution across the southwestern USA and northern BC. This species has a strong preference for pollen from plants in the family Brassicaceae Ribble (1967). Within the BCP, its presence was first documented in BC’s Succulent Coastal Matorral (Ribble, 1968). We reviewed one female collected in April 1963 in the Chaparral region south of Tecate and confirmed a female reported by Ribble (1968) from the Succulent Coastal Matorral in April 1963 (CASC). Additionally, the BBPT collected 12 females in the Coastal Sage Matorral in March (1) and April (11) of 2021. Voucher specimens are in BBSL, ECOAB, and MABC. See fig. 15.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF48A530599F8F2FBE993F3.taxon	materials_examined	[Holotype: CASC; ♀ San Diego, California, US; May 30, 1980]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF48A530599F8F2FBE993F3.taxon	description	This species is a pollen specialist on plants in the genus Camissonia Link (LaBerge & Thorp 2005). It occurs in California, USA and BC, Mexico (LaBerge & Thorp 2005). We reviewed one specimen reported by LaBerge & Thorp (2005) collected in March 1961 in La Zapopita, Valle de La Trinidad in the Chaparral region (LACM). The BBPT collected 2 females in Coastal Sage Matorral in May 2022 (MABC). See fig. 16.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF58A520598FF63FE689544.taxon	materials_examined	[Holotype: CASC; ♀ Boron, Kern Co. California, US; April 3, 1959]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF58A520598FF63FE689544.taxon	discussion	Andrena boronensis is a pollen specialist on plants in the genus Camissonia Link (LaBerge & Thorp 2005). It has been reported in the Succulent Coastal Matorral of the CFP in BC and in Vizcaíno Desert in BCS (LaBerge & Thorp 2005). It is worth noting that LaBerge & Thorp (2005) initially cited Guerrero Negro under BC; however, this locality is in BCS. See fig. 16.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF68A510599FF63FD949566.taxon	materials_examined	[Holotype: CASC; ♀ 7.25 km northeast of Santa Margarita, San Luis Obispo Co., California, US; April 28, 1959]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF68A510599FF63FD949566.taxon	discussion	Andrena furva is a pollen specialist on plants in the genus Camissonia Link (LaBerge & Thorp 2005). It inhabits the CFP in California, USA and BC, Mexico. Within BC this species was reported by Hurd (1979) and confirmed by Ayala et al. (1996). See fig. 17.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF68A510598FE9BFC17963E.taxon	materials_examined	[Holotype: CASC; ♀ 3.21 km north of Palm Springs, California, US; March 7, 1936]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF68A510598FE9BFC17963E.taxon	discussion	Andrena linsleyi specializes on pollen from plants in the genus Oenothera L. (LaBerge & Thorp 2005). This species has been reported in the Lower Colorado Desert in Baja California by LaBerge & Thorp (2005), but we were unable to georeference the record due to an incomplete locality description.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF68A510598FDB3FB5896D6.taxon	materials_examined	[Holotype: CASC; ♀ Gavilan, Riverside Co., California, US; March 20, 1932]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF68A510598FDB3FB5896D6.taxon	discussion	This species has been recorded in the Coastal Sage Matorral and Chaparral ecoregions of BC and it is a pollen specialist on plants in the genus Camissonia Link (LaBerge & Thorp 2005). The BBPT collected a single female specimen in the Coastal Sage Matorral at Valle de Guadalupe in April 2021 (MABC). See fig. 17.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF68A510598FC7FFBC19086.taxon	materials_examined	[Holotype: UCRC; ♀ Ensenada, Baja California, Mexico; March 25, 1941]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF68A510598FC7FFBC19086.taxon	discussion	Andrena atypica is a common species within the BCP. Its presence was first documented in the Coastal Sage Matorral by LaBerge & Ribble (1972). The BBPT also collected a male in the Baja California Mountains in El Condor in 1988 preserved at SDNHM, and three females collected in 1963 at Arroyo Santo Domingo in Succulent Coastal Matorral preserved at CASC. The BBPT collected this species in the Chaparral in April (1 ♀), and May (1 ♀) 2021, and March (1 ♀) 2022, the Succulent Coastal Matorral in April 2023 (1 ♀), and Central Desert in March 2021 (3 ♀). Voucher specimens are in MABC (4 ♀) and ECOAB (3 ♀). See fig. 18.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF68A510598FACFFD3F91E6.taxon	materials_examined	[Lectotype: USNM; ♀ College Farm, Mesilla Valley, New Mexico, US; March 26, 1896]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF68A510598FACFFD3F91E6.taxon	discussion	Andrena fracta was recorded in Magdalena Plains in Ciudad Constitución, BCS in February 1974. Specimens are preserved in the BBSL (GBIF 2023). See fig. 18.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF78A500598F8F2FAB7934F.taxon	materials_examined	[Holotype: CASC; ♀ Mountains near Claremont, Los Angeles Co., California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFF78A500598F8F2FAB7934F.taxon	discussion	Andrena chlorura was collected in the Coastal Sage Matorral, BC in February 1946 (UCRC). See fig. 19.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF888A2F0598FF14FB9095AD.taxon	materials_examined	[Holotype: CASC; ♀ Riverside, California, US; March 12, 1945]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF888A2F0598FF14FB9095AD.taxon	discussion	The first known record of Andrena cruciferarum on BCP was collected in Chaparral habitat to the north of the state in April 1963 and it is vouchered at INHS (GBIF 2023). In our fieldwork, the BBPT collected one female in the Coastal Sage Matorral in Guadalupe Valley in April 2021 (MABC). See fig. 19.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF898A2E0599FF14FB6C9541.taxon	materials_examined	[Holotype: ULQC; ♀ Los Angeles, California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF898A2E0599FF14FB6C9541.taxon	discussion	LaBerge (1977) reports Andrena nigra in the Chaparral of Valle de la Trinidad in BC. Our study contributes an additional record of this species in the Coastal Sage Matorral, collected in March 2022. See fig. 19.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF898A2D0598F85FFE1E94DE.taxon	materials_examined	[Holotype: UNSM; ♀ Washington, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF898A2D0598F85FFE1E94DE.taxon	discussion	One male of Andrena angustitarsata is reported from the Chaparral ecoregion near Ojos Negros, BC by the UCRC. We also reviewed two females collected in the Baja California Mountains near the USA border in 1981 and 1988 (SDNHM). See fig. 20.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8A8A2D0598FED3FAA6963E.taxon	materials_examined	[Holotype: ANSP; ♀ Corvallis, Oregon, US; June 4, 1897]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8A8A2D0598FED3FAA6963E.taxon	discussion	Andrena pallidifovea was first reported by LaBerge (1989) in the Succulent Coastal Matorral of BC. Additionally, we identified a previously undetermined female collected in the Baja California Mountains at El Condor locality in April 1988, and another in the Succulent Coastal Matorral in Colonet in 2017 (SDNHM). The BBPT collected five females of this species in three different localities of the Coastal Sage Matorral in April 2020, June 2020, April 2021, and April 2022 and a last one from the Succulent Coastal Matorral in March 2021 (MABC). See fig. 20.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599FF14FD6A9589.taxon	materials_examined	[Holotype: NHMUK; ♀ Vancouver’s Island, British Columbia, Canada]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599FF14FD6A9589.taxon	discussion	LaBerge (1977) reported Andrena candida in the Coastal Sage Matorral, Succulent Coastal Matorral, and Chaparral of the CFP in Baja California. We reviewed three males and one female collected in the Succulent Coastal Matorral in Arroyo Santo Domingo in April 1963. The BBPT collected two females in Ejido A. Melendrez in April 2020 and March 2021 (1 ♀ MABC; 1 ♀ ECOAB). See fig. 21.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599FE28FB13968D.taxon	materials_examined	[Holotype: CASC; ♀ Coyote Creek (7.24 km N. of Borrego Springs), San Diego Co., California, US; March 17, 1960]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599FE28FB13968D.taxon	discussion	Andrena declinis occurs in the southwestern USA, and BC, Mexico. We examined one female collected in the Central Desert in May 1975 (LACM). Within the scope of this project, the BBPT collected three specimens in March of 2021 in the Succulent Coastal Matorral and Central Desert (MABC). See fig. 21.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599FD2CFBBF9779.taxon	materials_examined	[Holotype: ♀ Pearblossom (1.61 km S.), Los Angeles Co., California; April 23, 1956]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599FD2CFBBF9779.taxon	discussion	Andrena illustris represents a new species record for Mexico. The BBPT collected one specimen in the Coastal Sage Matorral in June 2020 and another in Chaparral in May 2022 (MABC). See fig. 21.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599FC78FB0297C9.taxon	materials_examined	[Holotype: INHS; ♀ 1.61 km of Portal, Cochise Co., Arizona, US; April 13, 1961]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599FC78FB0297C9.taxon	discussion	This species was reported in the Gulf Coast in Mulegé, BCS (LaBerge 1977). See fig. 22.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599FBE8FDF990CD.taxon	materials_examined	[Holotype: EMEC; ♀ Surprise Canyon, Panamint Mts., Inyo Co., California, US; April 8, 1955]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599FBE8FDF990CD.taxon	discussion	This species is found in both the SD and the CFP. LaBerge (1977) reported its presence in the Baja California Mountains and the Lower Colorado Desert at San Felipe, BC. We confirmed two specimens reported by LaBerge (1977) collected in Sierra Juarez in March 1967 (EMEC). Additionally, the BBPT collected 5 females in April, 2023 in the Central Desert (MABC). See fig. 23.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599F9E0FE9493B1.taxon	materials_examined	[Lectotype: CASC; ♂ west side of El Taste, Baja California Sur, Mexico; September 1983?]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8B8A2C0599F9E0FE9493B1.taxon	discussion	Mesoxaea vagans is endemic to the southern region of the BCP and has been reported multiple times in the Sarcocaulescent Shrubland, Magdalena Plains, and the southern Gulf Coast (Hurd & Linsley 1976). We examined 22 specimens collected in the Gulf Coast (5 ♂, 1 ♀ CASC; 1 ♂, 1 ♀ BBSL), Sarcocaulescent Shrubland (3 ♂, 1 ♀ CASC; 4 ♂ BBSL), and in the Vizcaíno Desert (4 ♂, 2 ♀ CASC), expanding the known distribution of this species. Additionally, the CARCIB team collected this species in the Gulf Coast (1 ♂) and Magdalena Plains (1 ♀) in April 2017, and in Sarcocaulescent Shrubland in September (6 ♂, 1 ♀), October (1 ♂), November (3 ♂) 2016, and April (1 ♀), and November (1 ♀) 2017. Voucher specimens are in the ASUHIC, BBSL, CASC, LACM, and CARCIB. See fig. 23.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8D8A290599F84EFE589566.taxon	materials_examined	[Holotype: AMNH; ♂ 3.21 km northeast of Portal, Cochise County, Arizona, USA; August 21, 1962]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8D8A290599F84EFE589566.taxon	discussion	This species flies in the late summer and early fall and specializes on pollen from late-blooming Asteraceae including Baccharis L., Pectis L., and Heterotheca Cass. to name a few Shinn (1967). C. pecctidis inhabits in the southwestern USA and northwestern Mexico (Shinn 1967). We reviewed 19 paratypes reported by Shinn (1967): 18 from the Gulf Coast region collected in San Pedro in October 1941 (15 ♂, 3 ♀), and one female collected in Sierra Laguna in October 1941. See fig. 24.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8E8A280598F8CAFD1594F2.taxon	materials_examined	[Holotype: CASC; ♀ Soboba Springs, Riverside Co., California, US; June 3, 1917]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8E8A280598F8CAFD1594F2.taxon	discussion	This species is a spring bee that specializes on pollen from early-blooming Asteraceae such as Chaenactis DC. and Encelia Adans. Sinn (1967). Calliopsis pugionis is a new species record for Mexico. The BBPT collected specimens from the CFP in Chaparral in June 2017, Coastal Sage Matorral in April and May 2020, and Succulent Coastal Matorral in March 2021 and April 2023. These habitats are characteristic of those in the USA where C. pugionis is found described by Shinn (1967). See fig. 24.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8F8A280598FE9BFB8495D2.taxon	materials_examined	[Holotype: CASC; ♂ Mt. Lemmon Road, Mt. Lemmon at 1067 mts, Arizona, US; August 15, 1954]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF8F8A280598FE9BFB8495D2.taxon	discussion	The CARCIB team collected Calliopsis empelia, which is a new species record for the BCP. Two males were collected at the Magdalena Plains in May 2017, and January 2019. See fig. 25.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF808A270598FF63FDCC9566.taxon	materials_examined	[Holotype: CASC; ♀ San Ignacio (24.14 km N.), Baja California Sur, Mexico; September 29, 1941]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF808A270598FF63FDCC9566.taxon	discussion	As the specific epithet suggests, this species is endemic to the BCP and is found in the Central Desert north of San Ignacio BCS (Shinn 1967). See fig. 25.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF808A270599FE9BFCA195D2.taxon	materials_examined	[Holotype: USNM (3701): ♂ Santa Fe, New Mexico, US; July 27, 1984?]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF808A270599FE9BFCA195D2.taxon	discussion	Calliopsis rhodophila is a new record for the BCP. The BBPT collected specimens in Valle de Guadalupe in the Coastal Sage Matorral in June 2020 (MABC). See fig. 26.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF818A260599FF63FDE395AE.taxon	materials_examined	[Holotype: BBSL; ♂ Rio Mayo, Sonora, Mexico; August 25, 1935]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF818A260599FF63FDE395AE.taxon	discussion	Shinn (1967) reported one female from the Gulf Coast in Canipolé, BCS collected on October 2, 1941. Shinn (1967) cited this specimen without certainty of being Calliopsis sonora due to the presence of a yellow maculation on the tegula and the length of the first labial palpi, which is inconsistent with other specimens. We compared the specimen to the allotype from Rio Mayo, Bernardino, Sonora and we find the morphology between the two specimens indistinguishable. See fig. 26.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250598FF2BFC859542.taxon	materials_examined	[Lectotype: CASC ♂ Phoenix, Arizona, US; October 7, 1899]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250598FF2BFC859542.taxon	discussion	This species is well distributed in the SD and has been reported in the Lower Colorado Desert (BC) and in La Giganta Ranges (BCS) by Danforth (1994). See fig. 27.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250598FE67FD44963E.taxon	materials_examined	[Holotype: UCRC; ♀ Oroz, Sonora, Mexico; September 17, 1957]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250598FE67FD44963E.taxon	discussion	This species inhabits the SD in the USA, and Mexico. We examined five specimens (3 ♂, 2 ♀) collected in the Gulf Coast, BCS in October 1941 (CASC). See fig. 27.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250598FDB3FB9E96D6.taxon	materials_examined	[Holotype: ANSP; ♂ Las Cruces, Doña Ana Co., New Mexico, 1893]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250598FDB3FB9E96D6.taxon	discussion	This species occurs in the southwestern USA and northern Mexico. The AMNH reports one female collected in the Lower Colorado Desert San Felipe, BC in March 1967 (GBIF 2023). We corroborate 24 specimens (15 ♂, 9 ♀) from the Lower Colorado Desert 15 mi. S Palacio, Mexicali, BC (CASC). See fig. 27.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250599FC7FFD299012.taxon	materials_examined	[Holotype: CUIC; ♂ Ysleta, El Paso Co., Texas, US; September 4, 1927]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250599FC7FFD299012.taxon	discussion	Calliopsis callosa specializes on pollen from Tidestromia Standl. in the family Amaranthaceae (Fowler 2020). This species was collected in the Gulf Coast region in BCS in October 1941 (Rozen 1958) and the associated specimens (3 ♂, 2 ♀) are vouchered at CASC. See fig. 28.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250590FB97FB4A9116.taxon	description	[Holotype: SEMC; ♂ Andreas Canyon, Palm Springs, Riverside Co., California, US; April 6, 1939]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250590FB97FB4A9116.taxon	discussion	Calliopsis fracta specializes on pollen from spring-blooming plants in the family Boraginaceae (Fowler 2020). This species is a new record for Mexico as a result of the BBPT field surveys. The BBPT collected this species in northern BC in the Coastal Sage Matorral in May and June 2020, April 2021, and May 2022; and in Chaparral and the Baja California Mountains in May 2022 (10 ♀, 3 ♂ MABC; 4 ♀, 2 ♂ ECOAB). See fig. 28.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250599FAABFCB9920A.taxon	description	[Holotype: UNSM; ♀ Warbonnet Canon, Sioux County, Nebraska, July 12, 1901]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250599FAABFCB9920A.taxon	discussion	Calliopsis helianthi specializes on pollen from plants in the family Euphorbiaceae (Fowler 2020). This species was documented in both BC and BCS by Ayala et al. (1996). Additionally, we examined six females collected in the Central Desert (BC) and Gulf Coast (BCS) in September and October 1941 (CASC), and one female collected in the Central Desert (BC) in March 2014 (CNIN). See fig. 28.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250599F9AFFDDB9322.taxon	materials_examined	[Holotype: UNSM: ♂ Southern California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF828A250599F9AFFDDB9322.taxon	discussion	Calliopsis hesperia is a specialist on plants in the Boraginaceae genus Heliotropium L. (Fowler 2020). This is a new species record for Mexico. The BBPT captured specimens in June 2020 in the Coastal Sage Matorral in the Guadalupe Valley (MABC). See fig. 29.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF838A240599F94AFCA393AB.taxon	materials_examined	[Holotype: SEMC; ♂ Andreas Canyon, Palm Springs, California, US; April 10, 1936]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF838A240599F94AFCA393AB.taxon	discussion	This species is a specialist on flowering shrubs in the genus Eriodictyon Benth. (Fowler 2020). This species was reported in BCS by Ayala et al. (1996), but there is no public access to that record’s information. The BBPT collected C. linsleyi in Chaparral and the Baja California Mountains in BC in May 2022. Voucher specimens are in MABC (19 ♀, 29 ♂) and ECOAB (6 ♀, 5 ♂). See fig. 29.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF848A230598F94AFB56934E.taxon	materials_examined	[Holotype: ♂ Riverside, California, US; April 29, 1929]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF848A230598F94AFB56934E.taxon	discussion	Calliopsis mellipes specializes on pollen from plants in the family Fabaceae including Lotus L. and Acmispon Raf. (Fowler 2020). This represents a new species record for Mexico. In this study, we examined a female specimen collected from El Condor in the Baja California Mountains in April 1988 (SDMNH). See fig. 29.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF848A220598F862FBB194F2.taxon	description	[Holotype: UCRC; ♀ North of Cathedral City, Riverside Co., California, US; October 8, 1945]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF848A220598F862FBB194F2.taxon	discussion	Calliopsis nigromaculata specializes on pollen from plants in the family Euphorbiaceae (Fowler 2020). This species was previously known only to Sonora, and this marks a new species record in the BCP based on a male we examined that was collected in the Central Desert of BC in March 2014 (CNIN). See fig. 30.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF858A220599F902FA0293E3.taxon	materials_examined	[Lectotype: ANSP; ♀ California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF858A220599F902FA0293E3.taxon	discussion	This species specializes on pollen from Eschscholzia Cham. (Fowler 2020). There are records for this species from Ensenada City (UCRC). Additionally, the BBPT collected this species in the Succulent Coastal Matorral region in March 2021 (1 ♀), in Coastal Sage Matorral in April (2 ♀) and May 2022 (1 ♀), and April 2023 (1 ♂), and in the Central Desert in April 2023 (2 ♂). Voucher specimens are in MABC (3 ♂, 2 ♀) and ECOAB (2 ♀). See fig. 30.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF868A210599FF63FDC7958E.taxon	materials_examined	[Holotype: AMNH; ♀ Borrego, San Diego Co., California, US; April 3, 1932]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF868A210599FF63FDC7958E.taxon	discussion	This species occurs in the southwestern USA and northwestern Mexico (Rozen 1958) and specializes on pollen from plants in a broad range of genera in the family Asteraceae (Fowler 2020). BBSL reports digitized records from the Magdalena Plains (GBIF 2023). Additionally, we identified four specimens captured in the Central Desert in March 2014 (1 ♀; CNIN), March 1973 (2 ♂) and April 1973 (1 ♀; EMEC). The BBPT collected Calliopsis puellae in La Rumorosa within the Baja California Mountains in May 2022 (3 ♂, 1 ♀), and the Succulent Coastal Matorral in April 2023 (6 ♀; MABC). See fig. 30.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF868A210599FE24FEF1965E.taxon	materials_examined	[Syntype: ANSP, Colorado, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF868A210599FE24FEF1965E.taxon	discussion	Calliopsis scitula marks a new species record in Mexico and the BCP. As part of this study, we examined two specimens collected in the BC Mountains in Sierra San Pedro Mártir, in May (1 ♀), and June (1 ♂) 1958 from EMEC. See fig. 31.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF878A200599FF63FB4D9566.taxon	materials_examined	[Type: ♂, Fresno, California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF878A200599FF63FB4D9566.taxon	discussion	Calliopsis scutellaris is widespread, occurring in both peninsular states. There are public records from the Gulf Coast in La Paz from GBIF (2023) associated with preserved specimens in the UCRC and SEMC. The BBPT surveys collected 10 males from the Lower Colorado Desert in April and May 2021. See fig. 31.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF878A3F0598F872FEFD953A.taxon	materials_examined	[Holotype: AMNH; ♂ Picacho Pass, Arizona, US; August 7, 1940]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF878A3F0598F872FEFD953A.taxon	discussion	Calliopsis anomoptera is a unique bee named for the abnormally shaped wings present in only the male. It specializes on pollen from plants in the family Euphorbiaceae in the genus Euphorbia L. (Fowler 2020, Shinn 1967). This species is widely distributed across the SD and Shinn (1967) reported its presence in the Gulf Coast region of BCS. We examined two males collected in October 1997 from La Sierra de San Francisco in the southern Central Desert (BBSL). See fig. 32.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF988A3F0599FEBFFCAF963E.taxon	materials_examined	[Holotype: CASC; ♀ San Ignacio, Baja California Sur, Mexico; September 29, 1941]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF988A3F0599FEBFFCAF963E.taxon	discussion	Calliopsis syphar is endemic to BCS. This species specializes on pollen from plants in the genus Euphorbia L. (Fowler 2020). It has been reported in the Central Desert, Vizcaíno Desert, La Giganta Ranges, and Gulf Coast ecoregions (Shinn, 1967). As part of this project, we examined two females collected from Sierra de San Francisco and San Sebastian in October 1997 (SDNHM). See fig. 32.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0598FC78FE5A907E.taxon	materials_examined	[Holotype: CASC; ♀ Triunfo, Baja California Sur, Mexico; July 7, 1938]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0598FC78FE5A907E.taxon	discussion	This species is endemic to BCS and has only been reported in the Tropical Dry Forest from the southeast region of the BCP. Specimens were collected in El Triunfo. One female paratype is preserved in the UCRC (Timberlake 1968; Danforth, 1996). See fig. 34.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0599FB00FC9091C1.taxon	materials_examined	[Holotype: UCRC; ♂ Picacho Pass, Arizona, USA; August 7, 1940]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0599FB00FC9091C1.taxon	discussion	Macrotera mellea is widely distributed in the northwestern deserts of Mexico. This species specializes on pollen from plants in the family Euphorbiaceae, specifically in the genus Euphorbia L. (Fowler 2020). It has been recorded in the Gulf Coast region of BCS and specimens are preserved in the CASC and BBSL (Timberlake 1954; Danforth 1996). We confirmed six specimens (4 ♀, 2 ♂) vouchered at CASC, of which five are paratypes collected in Canipole (3 ♀) and Coyote Cove (1 ♀, 1 ♂). See fig. 35.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0598F9E0FCF492BD.taxon	materials_examined	[Holotype: CASC; ♂ Furnace Creek, Death Valley, California, US; April 23, 1935]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0598F9E0FCF492BD.taxon	discussion	This species is a new species record in Mexico and the BCP. The BBPT collected one male in the Baja California Mountains at La Rumorosa in May of 2022 (MABC). See fig. 35.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0598F93CFE949355.taxon	materials_examined	[Holotype: CASC; ♂ Artist Drive, west side of Death Valley, California, US; April 7, 1939]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0598F93CFE949355.taxon	discussion	Macrotera nigrella is a new species record in Mexico. The BBPT captured two females in May 2022, one in Sierra Juarez in the Baja California Mountains and the other in Coastal Sage Matorral in Valle de Guadalupe (MABC). See fig. 35.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0599FEDCFC05958A.taxon	materials_examined	[Holotype: ♂ Arroyo Seco (San Gabriel Mountains), Los Angeles County, California, US; January 27, 1935]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0599FEDCFC05958A.taxon	discussion	Panurginus gabrielis has only been reported in southern California, USA and BC, Mexico. Within BC this species was reported by Hurd (1979) and confirmed by Ayala et al. (1996).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0598FE28FAC39646.taxon	materials_examined	[Holotype: CASC; ♂ Altadena, California, US; March 5, 1933]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF998A3E0598FE28FAC39646.taxon	discussion	There are records of P. gracilis (GBIF 2023) associated with vouchered specimens at UCRC from BC in the Coastal Sage Matorral south of Ensenada City. Ayala et al. (1996) report this species for the peninsula. See fig. 33.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9A8A3D0599F917FD2793F3.taxon	materials_examined	[Lectotype: USNM; ♂ Calmalli Mines, Ensenada, Baja California, Mexico; April 1889]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9A8A3D0599F917FD2793F3.taxon	discussion	Macrotera arcuata specializes on pollen from Sphaeralcea A. St. - Hil. (Fowler 2020). This species is widely distributed in the PCB with records in both states. There are records in the Succulent Coastal Matorral, Central Desert, Vizcaíno Desert, La Giganta Ranges, Gulf Coast, Sarcocaulescent Shrubland and Cape Mountains (Timberlake 1954). We reviewed 19 specimens (11 ♀, 8 ♂) from different localities the BCP (CASC), and one male preserved at CNIN (Supplementary material 1). See fig. 34.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9B8A3C0598F8BAFD4393DF.taxon	materials_examined	[Holotype: CASC; ♀ Riverside Co., California, US; March 28, 1936]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9B8A3C0598F8BAFD4393DF.taxon	discussion	Perdita albihirta specializes on pollen from a broad range of plants in the family Asteraceae (Fowler 2020). The species is well distributed in the Sonoran and Mojave Desert. Within BC this species has been previously reported in BC in the Laguna Salada (UCRC). See fig. 36.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9C8A3B0599F96EFBFB9363.taxon	materials_examined	[Holotype: UCRC; ♀ 99.78 km south of El Crucero, Baja California Sur, Mexico; 6 Nov 1965]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9C8A3B0599F96EFBFB9363.taxon	distribution	Perdita albomaculata spans the length of the peninsula and has records in BC and BCS in the Lower Colorado, Vizcaíno Desert and La Giganta Ranges. The female type specimen is vouchered in the UCRC, and there are other verified specimens vouchered at BBSL and the SDNHM (Timberlake 1980). See fig. 36.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9D8A3A0598FF2BFC1895F6.taxon	materials_examined	[Holotype: CASC; ♀ Coyote Cove, Concepción Bay, Baja California Sur, Mexico; October 1, 1941]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9D8A3A0598FF2BFC1895F6.taxon	discussion	Perdita binotata specializes on pollen from plants in the genus Physalis L. (Fowler 2020). This species is widespread with records in both BC and BCS. Holotype and allotype specimens of Perdita binotata were collected in the Gulf Coast region in BCS and are vouchered in the CASC and UCRC collections (Timberlake 1954). We reviewed 21 specimens (17 ♂, 4 ♀) including the allotype and three male paratypes collected in Coyote Cove, Concepción Bay in BCS and 17 specimens collected at Canipole (CASC). See fig. 37.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9E8A390599FF63FDD19566.taxon	materials_examined	[Holotype: CASC; ♂ La Laguna, Sierra Laguna, Baja California Sur, Mexico; October 14, 1941]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9E8A390599FF63FDD19566.taxon	discussion	Perdita dissimulans is an endemic species of the Cape Tropical Region in BCS. The holotype is from Sierra La Laguna (Timberlake 1954). See fig. 37.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9E8A390599FE9BFCD0963E.taxon	materials_examined	[Holotype: CASC; ♀ 24.14 km north of San Ignacio, Baja California Sur, September 29, 1941]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9E8A390599FE9BFCD0963E.taxon	discussion	This species spans from Arizona, USA to BCS. We reviewed 12 specimens including the allotype (♂), and three paratypes (2 ♀, 1 ♂) collected in the Central Desert, 15 mi. N. San Ignacio, BCS, and one paratype (♀) collected in the Gulf Coast region in San Pedro, BCS (CASC). See fig. 37.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A3805F9FB96FE4F90CE.taxon	discussion	All of the bees in the subgenus specialize on pollen from plants in the family Boraginaceae, particularly Tiquilia Pers. (Portman et al. 2016).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380598FF63FBFE95AE.taxon	materials_examined	[Holotype: UCRC; ♂ North of Cathedral City, California, US; October 8, 1945]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380598FF63FBFE95AE.taxon	discussion	Perdita polycarpae is a specialist on pollen from plants in the genus Euphorbia L. Timberlake (1954). This species is widely distributed in the SD in Arizona and California, USA. In Mexico, it has only been collected in BCS (Timberlake 1954). We reviewed one specimen determined by Timberlake from Las Animas, Sierra Laguna in October 1941 (CASC), and added coordinates to this location, however, we acknowledge that the location may have a significant margin of error due to the lack of precise geographic references. See fig. 38.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380590FE43FB3B968E.taxon	materials_examined	[Holotype: CASC; ♀ 16.09 km east of Bahia San Quintin, Baja California, Mexico; 10 September 1955]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380590FE43FB3B968E.taxon	discussion	Perdita williamsi has few occurrences widely distributed in the BCP, meaning it is widespread but likely locally rare. It has been collected in the Succulent Coastal Matorral in the CFP in BC and in the Gulf Coast in La Paz, BCS (Timberlake 1962). We reviewed six specimens at CASC including the allotype (♂), and one paratype collected 10 mi. E. of Bahia San Quintin, BC, and two paratypes (♀) collected in La Paz, BCS. See fig. 38.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380599FCB7FDBB9036.taxon	materials_examined	[Holotype: USNM; ♀ California, US]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380599FCB7FDBB9036.taxon	discussion	This species specializes on pollen from plants in the family Fabaceae, specifically the genera Lotus L. and Acmispon Raf. (Fowler 2020). There are records of this species from the Coastal Sage Matorral in BC (Timberlake 1954). There are no more recent records of it in the BCP, but it has been recently detected in San Diego County in California, USA (Hung et al., 2015). See fig. 39.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380599FAE3FCD491BA.taxon	materials_examined	[Holotype: UCRC; ♂ 12.87 km east of Edom, Riverside Co., California, US; April 17, 1937]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380599FAE3FCD491BA.taxon	discussion	Perdita arenaria has been collected in La Laguna Salada in the Lower Colorado Desert, BC (Portman et al. 2016) and it is found in southwestern deserts in the USA. See fig. 39.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380599FA3FFCA19276.taxon	materials_examined	[Holotype: CASC; ♂ Near Westmoreland, Imperial Co., California, US; May 31, 1930]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380599FA3FFCA19276.taxon	discussion	This species inhabits the southwestern USA and BC, Mexico. One specimen of P. coldeniae was collected in 1968 in the Lower Colorado Desert in BC (UCRC). See fig. 39.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380598F98BFD969322.taxon	materials_examined	[Holotype: UCRC; ♀ Near Westmoreland, Imperial Co., California, US; May 31, 1930]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380598F98BFD969322.taxon	discussion	This species has only been detected in the Lower Colorado Desert in BC near the border with Arizona, USA (Portman et al. 2016). See fig. 40.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380599F8C7FD6B939E.taxon	materials_examined	[Holotype: BBSL (120002); ♂ Devil’s Playground, San Bernardino Co., California, US; June 4, 1980]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF9F8A380599F8C7FD6B939E.taxon	discussion	Perdita yanegai has been collected in the Lower Colorado Desert, north of San Luis Gonzaga Bay in BC (UCRC) and it is known from southwestern USA. See fig. 40.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF918A360599F916FE609396.taxon	materials_examined	[Holotype: CASC; ♀ Ruffo Ranch, Isla Cerralvo, Baja California Sur, Mexico; March 22, 1953]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF918A360599F916FE609396.taxon	discussion	This is an endemic species to the southern BCP. It has only been collected in the Sarcocaulescent Shrubland region in the Island Jacques Cousteau (Isla Cerralvo) near the tip of the peninsula (Timberlake 1958) and it has not been recently detected. See fig. 41.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF938A340599FF63FE439542.taxon	materials_examined	[Syntypes: USNM; ♀ Tempe and Phoenix, Arizona, US; October 1899]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF938A340599FF63FE439542.taxon	discussion	This species occurs in the southwestern USA and BC, Mexico. This species specializes on pollen from plants in a broad range of genera in Asteraceae (Fowler 2020). We confirmed the single specimen of P. heterothecae recorded for Mexico (Timberlake 1956), which is a female collected in the Lower Colorado Desert in Mexicali, BC in June 1939 (CASC). See fig. 41.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF938A340598FE67FB02961A.taxon	materials_examined	[Holotype: CASC; ♀ 17.6 km west of Santo Tomas, Baja California, Mexico; July 11, 1969]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF938A340598FE67FB02961A.taxon	discussion	Perdita infuscata is an endemic species of the Coastal Sage Matorral of BC and it is known only from a single specimen that is vouchered at CASC, which we reviewed (Timberlake 1977). See fig. 42.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF948A330599FE0BFDD196D6.taxon	materials_examined	[Holotype: CASC; ♀ Santo Domingo, Baja California Sur, Mexico; July 17, 1938]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF948A330599FE0BFDD196D6.taxon	discussion	This species is endemic to the BCP and has been collected in the Lower Colorado Desert in northern BC, in the Magdalena Plains, and the Sarcocaulescent Shrubland in BCS. We reviewed the allotype (♂) and six paratypes (5 ♂, 1 ♀) collected in the Magdalena Plains in October 1941, and two specimens collected in the Sarcocaulescent Shrubland in January 1959. See fig. 42.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF948A330598FC7FFDE89012.taxon	materials_examined	[Holotype: CASC; ♂ Palm Cañon, Isla Angel de la Guarda, Gulf of California, Baja California; May 3, 1921]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF948A330598FC7FFDE89012.taxon	discussion	This species is endemic to BC (Ayala et al. 1996) and was first described by Cockerell (1923) with a single specimen from Isla Angel de la Guarda. See fig. 43.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF948A330598FB3BFB2991BA.taxon	materials_examined	[Holotype: UCRC; ♀ Cathedral City, Riverside Co., California, USA; Oct 8, 1945]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF948A330598FB3BFB2991BA.taxon	discussion	Perdita abdominalis is widely distributed in the SD in Arizona and California, USA in the north and down to the BCP in the Gulf Coast and the Sarcocaulescent Shrubland ecoregions in the tip of BCS. It specializes on pollen from plants in the genus Pectis L. (Fowler 2020). We reviewed 14 specimens including 13 paratypes (9 ♂, 4 ♀) collected in Canipole (2 ♂, 1 ♀) and San Pedro (7 ♂, 3 ♀), BCS in October 1941 (CASC). See fig. 43.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF948A330599FA3FFCF69276.taxon	materials_examined	[Holotype: CASC; ♀ San Felipe Creek, near Scissors Crossing, San Diego Co., California, USA; June 5, 1936]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF948A330599FA3FFCF69276.taxon	discussion	This species represents a new species record for Mexico confirmed by reviewing 32 specimens collected in Rosarito and Rancho el Progreso in September 1977 (LACM). See fig. 43.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF948A330599F98BFCAA936A.taxon	materials_examined	[Holotype: CASC; ♀ Parker Dam, San Bernardino Co., California, USA; April 22, 1951]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF948A330599F98BFCAA936A.taxon	discussion	Perdita adustiventris was first described from the southwestern USA and was first reported in the Gulf Coast Region in Isla Angel de La Guarda and the Lower Colorado Desert in Bahia de los Ángeles, BC, México in Timberlake (1971). This species specializes on pollen from plants in the genus Mentzelia L. (Fowler 2020). We confirmed these records by reviewing the specimens at LACM. See fig. 44.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF958A320599F94AFBE6934F.taxon	materials_examined	[Holotype: CASC; ♂ 41.8 km south of San Felipe, Baja California, Mexico; April 15, 1965]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF958A320599F94AFBE6934F.taxon	discussion	This species is endemic to the Lower Colorado Desert in BC. We reviewed the allotype (♀) and two paratypes (1 ♀, 1 ♂) collected 26 mi. S. San Felipe, BC in April 1965 vouchered at CASC. See fig. 44.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF958A310590F862FE4394F2.taxon	materials_examined	[Holotype: USNM; ♀ San José de Guaymas, Sonora, Mexico; April 10, 1898]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF958A310590F862FE4394F2.taxon	discussion	Perdita ashmeadi specializes on pollen from the genus Prosopis L. (Fowler 2020). We reviewed 11 specimens, five males collected in the Lower Colorado Desert, BC in April 1939, and six (3 ♀, 3 ♂) in the Gulf Coast, BCS in March 1953 (CASC). See fig. 44.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF968A310599F902FF3993E3.taxon	materials_examined	[Holotype: USNM; ♂ Salt Creek, Orocopia Mts., Riverside Co., California, USA; March 19 – 20, 1927]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF968A310599F902FF3993E3.taxon	discussion	This species inhabits California, USA and the BCP, Mexico and specializes on pollen from the genus Mentzelia L. (Fowler 2020). There are eight specimen records from the Lower Colorado Desert vouchered at the BBSL (GBIF 2023). We reviewed one male collected in the Lower Colorado Desert, 50 mi. N. San Felipe, BC (CASC). See fig. 45.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF978A300599F94AFE71934E.taxon	materials_examined	[Holotype: CASC; ♀ 41.84 km south of San Felipe, Baja California, Mexico, April 15, 1965]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF978A300599F94AFE71934E.taxon	discussion	Perdita biornata is endemic to the Lower Colorado Desert of BC (Timberlake 1980). We examined the holotype specimen (CASC). See fig. 45.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF978A0F0599F862FDA094F2.taxon	materials_examined	[Syntype: ANSP; Albuquerque, New Mexico, USA; August 16, 1895]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF978A0F0599F862FDA094F2.taxon	discussion	As the name suggests, this species specializes on pollen from the plant genus Chamaesaracha (A. Gray) Benth. (Fowler 2020). This species has been sampled in the Coastal Sage Matorral in Ensenada, BC. Specimens are preserved in the CNIN. See fig. 45.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA88A0F0599FEF7FE0495F6.taxon	materials_examined	[Holotype: CASC; ♂ Hamliton Ranch, Baja California, Mexico; August 2, 1938]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA88A0F0599FEF7FE0495F6.taxon	discussion	Perdita concors is endemic to the Succulent Coastal Matorral of BC. Preserved specimens are vouchered at CASC and UCRC (Timberlake 1958). We reviewed three additional males collected in the same sampling event as the holotype. See fig. 46.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA98A0E0599FF63FD479542.taxon	materials_examined	[Holotype: USNM; ♂ Whitewater, Riverside Co., California, USA; April 19, 1925]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA98A0E0599FF63FD479542.taxon	discussion	This species is widely distributed in the southwestern USA, and it is present in the Lower Colorado Desert and the Coastal Sage Matorral of BC (Timberlake 1958). This bee specializes on pollen from Larrea tridentata (DC.) Coville (Fowler 2020). We reviewed three males: two collected in the Lower Colorado Desert and one in the Coastal Sage Matorral in April 1939 (CASC). See fig. 46.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA98A0E0599FE67FE02961A.taxon	materials_examined	[Syntype: ANSP; Albuquerque, New Mexico, USA; June 30, 1895]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA98A0E0599FE67FE02961A.taxon	discussion	Perdita crotonis specializes on pollen from plants in the genus Croton L. (Fowler 2020). This is a new record in the BCP. We examined specimens collected in the Lower Colorado Desert in San Felipe, in May 2005 (3 ♂, 1 ♀ MABC). See fig. 46.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0598FF63FCB495AE.taxon	materials_examined	[Holotype: UCRC; ♂ 3.22 km south of Travertine Rocks (about 8.05 km south of Oasis), Imperial Co., California, USA; March 29, 1936]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0598FF63FCB495AE.taxon	discussion	Perdita difficilis has a wide range throughout the southwestern USA and northern Mexico (Ayala et al. 1996). It specializes on pollen from Prosopis L. (Fowler 2020). SEMC reports specimens from El Mayor (GBIF 2023). Additionally, we reviewed 29 specimens collected in the Lower Colorado Desert in El Mayor (2 ♂, 1 ♀), and 20 mi. W. Mexicali (22 ♂, 4 ♀) in April 1939 (CASC). See fig. 47.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0599FE43FB87961A.taxon	materials_examined	[Holotype: UCRC; ♂ Eloy, Pinal Co., Arizona, USA; August 13, 1955]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0599FE43FB87961A.taxon	discussion	This species is known from the Gulf Coast region of BCS. We reviewed one male paratype vouchered at CASC collected in Canipolé locality in October 1941 (Timberlake 1962). See fig. 47.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0598FD9FFCCB971E.taxon	materials_examined	[Holotype: CASC; ♂ Agua Caliente (San Carlos), 18.5 km E of Maneadero, Baja California, Mexico; July 6, 1973]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0598FD9FFCCB971E.taxon	discussion	Perdita diminutiva is an endemic species of BC known from a single specimen collected once in the Chaparral at 18.5 km E of Maneadero, BC (Timberlake 1977). See fig. 47.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0599FC93FD509012.taxon	materials_examined	[Holotype: UCRC; ♀ Agua Verde Bay, Baja California Sur, Mexico; March 26, 1953]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0599FC93FD509012.taxon	discussion	Perdita duplicata is an endemic species of the Gulf Coast ecoregion in BCS. It has been collected in 1953 and 1958 and specimens are vouchered in BBSL and UCRC (GBIF 2023). We reviewed 29 (18 ♀, 11 ♂) specimens collected in Agua Verde in March 1953 (CASC). See fig. 48.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0598FB97FE709116.taxon	materials_examined	[Holotype: CASC; ♀ 49.89 km of Ensenada, Baja California, Mexico; August 1, 1934]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0598FB97FE709116.taxon	discussion	Perdita ensenadensis is an endemic species of the Coastal Sage Matorral of BC. Specimens of this species are vouchered at BBSL (GBIF 2023). Additionally, we reviewed one male collected in the Coastal Sage Matorral in Ensenada (CASC). See fig. 48.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0599FAABFCCD91C2.taxon	materials_examined	[Holotype: USNM; ♂ Furnace Creek Canyon, Death Valley, Inyo Co., California; May 1, 1927]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0599FAABFCCD91C2.taxon	discussion	This species was reported in BC by Ayala et al. 1996. We reviewed one female collected in the Lower Colorado Desert at 20 mi. S. Palacio in April 1939 (CASC). See fig. 48.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0599F9E7FCFF929A.taxon	materials_examined	[Holotype: CASC; ♂ 48.28 km north of El Crucero, Baja California Sur, Mexico; November 6, 1965]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0599F9E7FCFF929A.taxon	discussion	This species has only been collected in the Magdalena Plains in November 1965, and no other occurrences have been reported since its description (Timberlake 1971). See fig. 49.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0598F91FFEE593FA.taxon	materials_examined	[Syntype: CASC; ♂ Close to the Agricultural College, Las Cruces, Doña Ana Co., New Mexico, USA; May 13, 1895]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAA8A0D0598F91FFEE593FA.taxon	discussion	Perdita exclamans has a broad distribution across North American deserts and specializes on pollen from plants in the family Fabaceae (Fowler 2020). In BC, it has been exclusively recorded in the Lower Colorado Desert. Its sole documented record within the BCP dates back to April 1939, with preserved specimens pinned at SEMC (GBIF 2023). See fig. 49.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAB8A0C0599F94AFE9493AB.taxon	materials_examined	[Holotype: UCRC; ♀ 6.43 km east of Edom (now Thousand Palms), Riverside Co., California, USA; March 14, 1937]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAB8A0C0599F94AFE9493AB.taxon	discussion	This species is abundant in the Sonoran and Mojave Deserts in Arizona, California, and Nevada, USA. The BBSL holds 83 specimens collected in the Lower Colorado Desert at 70 mi. N. San Felipe in March 1966 (GBIF 2023). See fig. 49.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAC8A0B0599F94AFC1B934E.taxon	materials_examined	[Holotype: USNM; ♂ Probably near Meloland, Imperial Co., California, USA; April 1911]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAC8A0B0599F94AFC1B934E.taxon	discussion	This is a rare species that occurs in the Lower Colorado and Mojave deserts. In the BCP, it has only been reported in the Lower Colorado Desert south of Palacio (Hurd & Linsley 1975). We reviewed seven specimens (4 ♂, 3 ♀) collected 12 mi. South of Palacio in April 1939 (CASC). See fig. 50.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAC8A0A0599F862FCB8953A.taxon	materials_examined	[Holotype: CASC; ♀ 38.62 km South of Indio, near Travertine Rocks, Riverside Co., California, USA; March 25, 1933]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAC8A0A0599F862FCB8953A.taxon	discussion	Perdita fulvicauda is restricted to desert areas and is distributed in the SD in Arizona and California, USA, and BC, Mexico. In BC, it has been collected in several localities in the Lower Colorado Desert. Preserved specimen records are reported by the BBSL and UCRC. Additionally, we reviewed five specimens collected in March 1963 (LACM), and one female collected in April 1939 (CASC). See fig. 50.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAD8A0A0598F8D7FB1093D5.taxon	materials_examined	[Holotype: UCRC; ♀ Borego Valley, San Diego Co., California, USA; April 26, 1954]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAD8A0A0598F8D7FB1093D5.taxon	discussion	Perdita genalis specializes on pollen from Parkinsonia L. and Prosopis L., both in the family Fabaceae (Fowler 2020). We reviewed 53 specimens collected in the Lower Colorado Desert, of which 45 were captured in April 1939, and eight in April 1965. Additionally, we examined one female collected in the Sarcocaulescent Shrubland in April 2018 by SDNHM. Preserved specimens are vouchered at SEMC and SDNHM. See fig. 50.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAE8A090599F8A4FE7593DC.taxon	materials_examined	[Syntype: USNM; ♀ Juarez, Chihuahua, Mexico; October 6, 1899]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAE8A090599F8A4FE7593DC.taxon	discussion	This species is widely distributed in northwestern Mexico and specializes on pollen from plants in the genus Heliotropium L. (Fowler 2020). In BC, it has been sampled in The Lower Colorado Desert in Mexicali municipality (Timberlake 1958). See fig. 51.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAF8A080599FF63FC019566.taxon	materials_examined	[Holotype: LACM; ♀ 47.47 km southwest of San Ignacio, Baja California Sur, Mexico; February 24, 1959]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAF8A080599FF63FC019566.taxon	discussion	Perdita hirtuosa is endemic to the Vizcaíno Desert. It has been collected only once in 1959, and the specimen (Holotype) is vouchered in LACM (Timberlake 1980). See fig. 51.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAF8A080599FE9BFE0A963E.taxon	materials_examined	[Holotype: CASC; ♂ 41.84 km south of San Felipe, Baja California, Mexico; April 15, 1965]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFAF8A080599FE9BFE0A963E.taxon	discussion	Perdita impar is known only from the Lower Colorado Desert in BC (Timberlake 1980). The holotype is vouchered at CASC. See fig. 52.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA08A070599FF63FE9495AE.taxon	materials_examined	[Holotype: CASC; ♂ Cedros Island, Baja California, Mexico; June 3, 1925]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA08A070599FF63FE9495AE.taxon	discussion	This species is only known from Isla de Cedros, which is part of the Pacific Islands of BC (Timberlake 1962). Our examination included the female allotype, along with 25 paratypes (15 ♂, 10 ♀) collected during the same sampling event as the holotype, as well as 24 additional paratypes (22 ♀, 2 ♂) captured in July and August 1922 (CASC). See fig. 52.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA08A070599FE43FA929646.taxon	materials_examined	[Holotype: CASC; ♂ 8.85 km northwest of Todos Santos, Road to la Pastora, Baja California Sur, Mexico; January 13, 1959]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA08A070599FE43FA929646.taxon	discussion	Perdita leechi is endemic to the Gulf Coast ecoregion in La Paz, BCS (Timberlake, 1968). See fig. 52.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FF63FD299566.taxon	materials_examined	[Holotype: SEMC; ♀ 24.14 km southeast of Dryden, Terrell Co., Texas, USA; April 13, 1949]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FF63FD299566.taxon	discussion	Perdita lenis is widely distributed in the North American xeric regions and specializes on pollen from plants in the family Solanaceae (Fowler 2020). This species was collected in BC in the Coastal Sage Matorral in March 1992. Specimens are vouchered at CNIN. See fig. 53.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FE9BFC9D963E.taxon	materials_examined	[Syntype: USNM; ♂ San José de Guaymas, Sonora, Mexico; April 10, 1898]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FE9BFC9D963E.taxon	discussion	This species is widely distributed in the southwestern USA and northwestern Mexico and specializes on pollen from the family Fabaceae (Fowler 2020). We reviewed 94 specimens collected in the Lower Colorado Desert and the Coastal Sage Matorral in April 1939 (CASC). See fig. 53.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FDB3FD9596D6.taxon	materials_examined	[Holotype: CASC; ♀ Venancio, Baja California, Mexico; July 17, 1938]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FDB3FD9596D6.taxon	discussion	Perdita michelbacheri is widely distributed in the BCP deserts. It has been reported in northern BC in the Central Desert, and in the Magdalena Plains, and Gulf Coast in BCS (Timberlake 1962). We reviewed the male allotype and 19 paratypes (CASC). See fig. 53.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FCEBFE9497EE.taxon	materials_examined	[Holotype: USNM; ♂ Salt Creek, Orocopia Mts., Riverside Co., California, USA; March 20, 1927]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FCEBFE9497EE.taxon	discussion	This species occurs in the Sonoran and Mojave Deserts and specializes on pollen from plants in the genus Mentzelia L. (Fowler 2020). Within BC, it was recorded in the Lower Colorado Desert in March 1966 by BBSL (GBIF, 2023). See fig. 54.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060598FC03FE4390E2.taxon	materials_examined	[Holotype: CASC; ♂ Agua Verde Bay, Baja California, Mexico; March 26, 1953]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060598FC03FE4390E2.taxon	discussion	Perdita nigronotata is known from the Vizcaíno Desert and Gulf Coast by vouchered specimens at EMEC and CASC. We confirmed this with our fieldwork by capturing one male in March of 2021 at the Vizcaíno Desert in northern BCS. See fig. 54.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FB07FF3991E6.taxon	materials_examined	[Syntype: USNM; ♀ Las Cruces, Doña Ana Co., New Mexico, USA; May 2, 1895]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FB07FF3991E6.taxon	discussion	Perdita numerata is widely distributed in the warm North American deserts and specializes on pollen from plants in the family Fabaceae, particular Prosopis L. and Vachellia Wight & Arn. (Fowler 2020). In Baja California, it has been collected in the Lower Colorado Desert and the specimen is vouchered in SEMC (Timberlake 1960). See fig. 54.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FA1BFB7C929A.taxon	materials_examined	[Holotype: CASC; ♀ Baboquivari Mountains, Arizona, USA; August 20, 1924]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599FA1BFB7C929A.taxon	discussion	This species occurs in northwestern Mexico and the southwestern USA in Arizona and California. In the BCP, it has been recorded in the Gulf Coast and the Sarcocaulescent Shrubland ecoregions in BCS. Specimens are preserved in the UCRC, SEMC, and INHS collections. We reviewed six specimens, one male collected in the Gulf Coast 15 mi. W. La Paz, in September 1959, and the Magdalena Plains in July 1938 (3 ♀, 1 ♂; CASC). See fig. 55.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599F91FFE7D93B2.taxon	materials_examined	[Holotype: UCRC; ♂ 35.41 km south of Todos Santos, Baja California Sur, Mexico; November 9, 1965]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA18A060599F91FFE7D93B2.taxon	discussion	This endemic species of BCS has only been collected once and it was in the Sarcocaulescent Shrubland region (Timberlake, 1971). See fig. 55.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA28A050599F94AFB8D934F.taxon	materials_examined	[Holotype: UCRC; ♀ Blythe, Riverside Co., California, USA; May 7, 1947]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA28A050599F94AFB8D934F.taxon	discussion	Perdita plucheae specializes on pollen from plants in the genus Pluchea Cass. in the family Asteraceae (Fowler 2020). This species has been recorded in the SD in the states of Arizona, California, and Nevada, USA. Within BC this species was reported by Hurd (1979) and confirmed by Ayala et al. (1996).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA28A040599F862FF3994DE.taxon	materials_examined	[Holotype: UCRC; ♀ La Quinta, Riverside Co., California, USA; March 2, 1934]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA28A040599F862FF3994DE.taxon	discussion	Perdita polytropica is widely distributed in the southwestern USA and the BCP where it has been sampled in El Mayor range in the Lower Colorado Desert, BC, and in the Gulf Coast in BCS (Timberlake 1962). We reviewed seven specimens (6 ♂, 1 ♀) collected in the Lower Colorado Desert at El Mayor in April 1939 (CASC). See fig. 55.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA48A030599F94AFB319363.taxon	materials_examined	[Syntype: USNM; ♀ Stone Cabin Canyon, Santa Rita Mountains, Pima Co., Arizona; August 27, 1913]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA48A030599F94AFB319363.taxon	discussion	This species its present in the states of Arizona, and California in the USA, and BC and Sonora in Mexico (Ayala et al. 1996; Minckley & Radke 2021) and it is a pollen specialist on Mentzilia L. (Fowler 2020).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA48A020599F886FB67953A.taxon	materials_examined	[Syntype: USNM; ♂ Close to the Agricultural College, Las Cruces, Doña Ana Co., New Mexico, USA; May 13, 1895]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA48A020599F886FB67953A.taxon	discussion	This species is widely distributed in North American xeric regions and is a pollen specialist on Parkinsonia L., Prosopis L., and Vachellia Wight & Arn. in the family Fabaceae (Fowler 2020). In BCP it had been collected in the Lower Colorado Desert, Central Desert, and Gulf Coast regions. We reviewed 192 specimens from the BCP (CASC). Additionally, the BBPT collected seven specimens in La Giganta Ranges and the Gulf Coast in March of 2021 (5 ♀, 2 ♂). Voucher specimens are in ECOAB (3 ♀, 1 ♂) and MABC (2 ♀, 1 ♂). See fig. 56.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA58A020599FEBFFE02961A.taxon	materials_examined	[Holotype: USNM; ♂ Palm Wash, about 1.61 km of Highway 99 in northwest corner of Imperial Co., California, USA; April 18, 1925]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA58A020599FEBFFE02961A.taxon	discussion	Perdita punctulata is widely distributed in the SD and is a pollen specialist on creosote bush (Larrea tridentata (DC.) Coville) (Fowler 2020). We reviewed seven (6 ♂, 1 ♀) specimens collected in the Coastal Sage Matorral in Rosarito Beach (4 ♂), and the Lower Colorado Desert at 20 mi. W. Mexicali (1 ♀) and 20 mi. S. Palacio (2 ♂) (CASC). See fig. 56.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA68A010599FF63FBE9958A.taxon	materials_examined	[Syntype: USNM; ♀ In the immediate vicinity of the Brandegee Herbarium, San Diego Co., California, USA; August 4, 1901]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFA68A010599FF63FBE9958A.taxon	discussion	Perdita rhois is endemic to the CFP. In BC, it has been collected in the Coastal Sage Matorral and Succulent Coastal Matorral ecoregions. There are preserved specimen records from BBSL and UCRC (GBIF 2023). We reviewed 116 specimens collected in BC vouchered at the CASC (Supplementary Material 1). Unlike most of the species in this genus, P. rhois is polylectic and visits a wide taxonomic variety of flowers for pollen and nectar, though these flowers generally have white petals and are clustered in a panicle or umbel. See fig. 57.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFBA8A1D0599FF63FE4395AE.taxon	materials_examined	[Lectotype: CASC; ♂ Santa Margarita Island, Baja California Sur]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFBA8A1D0599FF63FE4395AE.taxon	discussion	Perdita ventralis has been recorded in the states BC and BCS in northwestern Mexico and Arizona, USA. There have been specimens collected in Baja California in the Coastal Succulent Scrub and in Baja California Sur on Santa Margarita Island in the Magdalena Plains. Specimens are vouchered in BBSL, SEMC, UCRC, and CASC (Timberlake 1962; GBIF 2023). We reviewed two males collected in the Succulent Coastal Matorral in September 1955 (CASC). See fig. 60.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB08A170598FBEFFBF990E2.taxon	materials_examined	[Holotype: CASC; ♂ 32.18 km north of Comondú, Baja California Sur, Mexico; October 3, 1941]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB08A170598FBEFFBF990E2.taxon	discussion	This species was described for BCS and is likely endemic to the peninsula (Timberlake 1975). We reviewed one male paratype collected in the same sampling event as the holotype (CASC). See fig. 66.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB08A170599FB07FA0C91BA.taxon	materials_examined	[Lectotype: CASC; ♀ Santa Margarita Island, Baja California Sur, Mexico]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB08A170599FB07FA0C91BA.taxon	discussion	This species appears to be endemic to the Magdalena Plains, with a single known record. The specimens were collected on the Pacific coastal Island of Santa Margarita in BCS (Cockerell 1899; Timberlake 1975). See fig. 66.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB08A170599FA3FFBB09252.taxon	materials_examined	[Holotype: AMNH; ♀ 22.53 km southwest of Apache, Cochise Co., Arizona, USA; August 7, 1961]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB08A170599FA3FFBB09252.taxon	discussion	The range of this species is the southwestern USA, and northwestern Mexico. In the BCP, it has only been collected in the Gulf Coast in BCS (Timberlake 1964). We reviewed three specimens (2 ♂, 1 ♀), including one female and one male paratypes collected in the Gulf Coast October 1941 (CASC). See fig. 66.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB08A170599F8FBFD5C93FA.taxon	materials_examined	[Holotype: CASC; ♂ Pescadero, Baja California, Mexico; October 8, 1941]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB08A170599F8FBFD5C93FA.taxon	discussion	To our knowledge, this species is endemic to the BCP. We reviewed two males, including one paratype, collected in the same sampling event as the holotype, though it is in poor condition (CASC). Additionally, this species has also been reported in BC (Ayala et al. 1996). See fig. 67.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB08A1705F9FD23FBAB97A6.taxon	description	We recognize Heterosarus Robertson, Pseudopanurgus Cockerell, and Pterosarus Timberlake as subgenera of Protandrena as in Bossert et al. (2022). The species of Protandrena present in the BCB require taxonomic revision, and the phylogeny of its subgenera needs to be re-evaluated (Bossert et al. 2022).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB08A1705F9FF63FE949566.taxon	discussion	This monotypic genus was previously recognized as a subgenus of Perdita (Michener, 2007). We adhere to the most recent classification outlined by Bossert et al. (2022), which is based on modern molecular phylogenomic techniques.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB28A150598FF2BFB2A95F6.taxon	materials_examined	[Holotype: CASC; ♂ Big Canyon, Sierra Laguna, Baja California Sur, Mexico; October 13, 1941]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB28A150598FF2BFB2A95F6.taxon	discussion	This species has been documented in both BC and BCS (Ayala et al. 1996). The holotype male and three male paratypes were collected in the Cape Mountains, Tropical Dry Forest, and Gulf Coast in October 1941 (Timberlake 1973). We reviewed one male paratype collected in the Gulf Coast in San Pedro October 1941 (CASC). Additionally, the CARCIB team collected one male in the Tropical Dry Forest in August 2016. See fig. 67.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB38A140598FF63FB9A9566.taxon	materials_examined	[Holotype: UCRC; ♀ 4.99 km south of Florence Junction, Pinal Co., Arizona, USA; September 3, 1961]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB38A140598FF63FB9A9566.taxon	discussion	We reviewed 11 paratypes (10 ♂, 1 ♀) from various localities: nine males collected in the Gulf Coast in San Pedro, one female in the Gulf Coast in Canipole, and one male in La Giganta Ranges 20 mi. N. Comondú, all collected in October 1941 (CASC). Ayala et al. (1996) report this species in BC. See fig. 67.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB38A140599FE9BFC1895D2.taxon	materials_examined	[Lectotype: UCMC; ♀ Las Cruces and Albuquerque, New Mexico, USA; September 23, 1895]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB38A140599FE9BFC1895D2.taxon	discussion	Protandrena fratercula was first reported in BC and BCS by Ayala et al. (1996). We reviewed six males collected in the Gulf Coast in San Pedro in October 1941 (CASC). See fig. 68.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB48A130598FF63FD36953A.taxon	materials_examined	[Syntype: CASC; ♀ Soledad Canyon, Organ Mountains, New Mexico, USA; August 15]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB48A130598FF63FD36953A.taxon	discussion	This species was first reported in BCS by Ayala et al. (1996). We reviewed two males collected in La Giganta Ranges in September 1977 (CASC). See fig. 68.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB48A130598FEBFFD0795F6.taxon	materials_examined	[Syntype: ♀ Soledad Canyon, Organ Mountains, New Mexico, USA]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB48A130598FEBFFD0795F6.taxon	discussion	This rare species has been recorded in Sonora and BCS in Mexico. We reviewed three males collected in the Gulf Coast in October 1941 (CASC). See fig. 68.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB58A120598F91FFE9493FA.taxon	materials_examined	[Holotype: ANSP; ♂ California]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB58A120598F91FFE9493FA.taxon	discussion	Anthophora californica is a common species in the southwestern USA, and northern Mexico. It is a vernal species, often seen in March and April. In BC, it has been recorded in Coastal Sage Matorral, the Succulent Coastal Matorral and the Chaparral in the CFP and in the Lower Colorado Desert and the Central Desert regions of the SD. The BBPT collected specimens in 2020, 2021, 2022, 2023 that are vouchered in MABC, ECOAB (Supplementary material 1). See fig. 70.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB58A1205F9FACEFE4691E6.taxon	discussion	We adhere to the most recent classification outlined by Orr et al. (2022), which recognizes Anthophorini as the only tribe within this subfamily.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB58A1205F9FBEEFE3190CE.taxon	discussion	We recognize five subfamilies: Anthophorinae, Apinae, Eucerinae, Nomadinae, and Xylocopinae, following the classification proposed by Bossert et al. (2019) based on modern molecular phylogenomic techniques by the combination of ultraconserved elements (UCE’s) and transcriptome sequencing, and recovered by Orr et al. (2022) using UCE’s sequencing.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB58A120599FDB3FCF496EA.taxon	materials_examined	[Lectotype: ANSP; ♂ California, USA]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB58A120599FDB3FCF496EA.taxon	discussion	This species is distributed throughout the CFP. In BC, it was recorded in the Coastal Sage Matorral near Ensenada City and Santo Tomas in April 1941 (Cockerell 1941). See fig. 69.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB58A120598FD0FFCEA97EE.taxon	materials_examined	[Lectotype: CASC; ♂ Cerro La Chinche, Baja California Sur, Mexico]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB58A120598FD0FFCEA97EE.taxon	discussion	Protandrena concinna is endemic to BCS. Cockerell (1923) first documented this species in Cerro La Chinche in the Tropical Dry Forest of BCS. We reviewed 14 specimens (12 ♀, 2 ♂) collected in the Cape Mountains in La Laguna, Sierra La Laguna in October 1941 (CASC). See fig. 69.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB68A110599F934FDDA93DD.taxon	materials_examined	[Holotype: SEMC; ♂ 10 km west Maricopa, Pinal Co., Arizona, USA; March 15, 1989]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FFB68A110599F934FDDA93DD.taxon	discussion	This species is present in both BC and BCS and is abundant in March and April; however, there is a single record from November of 2020 that suggests a potential bivoltine nature. Engel (2023) reported this species in BC (no locality) and BCS in the Vizcaíno Desert and the Sarcocaulescent Shrubland. We found records of this species from the Coastal Sage Matorral, Lower Colorado Desert, Succulent Coastal Matorral, Central Desert, Gulf Coast, and the Magdalena Plains. We examined two males collected in the Succulent Coastal Matorral in March 1960 and Vizcaíno Desert in April 1976 (EMEC). Additionally, recently captured specimens are vouchered at ECOAB, and MABC (Supplementary material 1). See fig. 70.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF488AEF0598FF2BFF39958A.taxon	materials_examined	[Holotype: AMNH; ♀ Cajon Canyon, at elevation of about 1067 mts, San Bernardino Co., California, USA; February 28, 1936]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF488AEF0598FF2BFF39958A.taxon	discussion	This species represents a new species record for Mexico. During our study, the BBPT collected one male in the Coastal Sage Matorral in April 2023 along the road from San Telmo to San Pedro Mártir National Park. See fig. 71.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF488AEF0598FE2FFB63968E.taxon	materials_examined	[Holotype: AMNH; ♂ Tubb Spring Canyon, Borrego, California, USA; March 21, 1935]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF488AEF0598FE2FFB63968E.taxon	discussion	Anthophora neglecta has been documented in the Chaparral and Succulent Coastal Matorral of the CFP, as well as in the Central Desert of BC (GBIF 2023). We reviewed one female collected in Cañon el Parral in Sierra San Pedro Mártir in January 1970 (CASC). Additionally, the BBPT collected four females in the Succulent Coastal Matorral at Colonet in January 2020. Voucher specimens are in MABC (2 ♀), and ECOAB (2 ♀). See fig. 71.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF4B8AEC0599FA53FE19929A.taxon	materials_examined	[Holotype: CASC; ♂ San Nicolas Bay, Baja California Sur, Mexico; May 16, 1921]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF4B8AEC0599FA53FE19929A.taxon	discussion	Anthophora pachyodonta is a xeric species distributed in the Sonoran and Mojave Deserts that specializes on pollen from plants in the family Asteraceae, especially Bebbia juncea Greene (Orr et al. 2018). It has been collected in BC’s Lower Colorado and Vizcaíno Deserts and in the Gulf Coast region of BCS (Orr et al. 2018). The BBPT collected 11 specimens, five in the Gulf Coast in Mulegé City, BCS in March 2021 (4 ♂, 1 ♀), and six in the Lower Colorado Desert in May 2022 and April 2023 (4 ♀, 2 ♂). Voucher specimens are in MABC (3 ♀, 3 ♂), and ECOAB (3 ♂, 2 ♀). See fig. 75.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF478AE005F9FD0EFD049783.taxon	description	Subgenus Cullumanobombus Vogt, 1911	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF588AFE0599F8F2FE9494DE.taxon	materials_examined	[Lectotype: ZMUC; ♀ America; Bombus (Fervidobombus) californicus Smith, 1854 (synonym) type: NHMUK; ☿ California, USA]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF588AFE0599F8F2FE9494DE.taxon	discussion	The individuals of this species inhabiting Baja California exhibit the coloration pattern of Bombus californicus. However, due to the lack of evidence supporting its status as a distinct species, we follow the treatment of Williams et al. (2014). Bombus fervidus is categorized as vulnerable on the IUCN Red List (IUCN 2022). This species has been reported in the Coastal Sage Matorral, Chaparral, and Baja California Mountains with vouchered specimens in LACM, UCRC, SEMC (GBIF 2023). During this project, it has been recorded exclusively in the Coastal Sage Matorral in April and May 2021; and May 2022. Voucher specimens are in MABC (1 ♀, 1 ♂), and ECOAB (1 ♀). See fig. 85.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF598AFD0599F902FB51953A.taxon	materials_examined	[Lectotype: NHRS; ♀ USA; Bombus (Thoracobombus) pensylvanicus sonorus Say, 1837 holotype: Tomas Say collection; ☿ Mexico]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF598AFD0599F902FB51953A.taxon	discussion	The individuals of this species in the Baja California Peninsula exhibit the coloration pattern of Bombus pensylvanicus sonorus, as described by Williams et al. (2014). This is the only bumble bee species found in BCS, where it is found in all ecoregions. In BC, it has been recorded in the Central Desert and the Coastal Sage Matorral with specimens in BBSL, EMEC, INHS, LACM, SEMC, and UCRC (GBIF 2023). We review 73 specimens from BCS (CASC). The BBPT collected six females in the Gulf Coast region, BCS in September and November 2020 (3 ♀ MABC; 3 ♀ ECOAB). However, we are aware of recent sightings of Bombus p. sonorus in San Diego County near the border with BC (Hung et al. 2015) as well as 28 observations on iNaturalist at the time of this writing (https: // www. inaturalist. org / observations? place _ id = 7403,8501 & subview = map & taxon _ id = 57690). See fig. 85.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0598FF14FB6B95AE.taxon	materials_examined	[♀ Guyana]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0598FF14FB6B95AE.taxon	discussion	Centris varia is primarily a tropical species that is distributed from southern Brazil to Mexico. A male collected in the Sarcocaulescent Shrubland in September 2016 and vouchered at CARCIB collection represents a new record for the BCP. To our knowledge, it is only present in the southern tip of the BCS peninsula. See fig. 86.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0598FDD0FD1B96D6.taxon	materials_examined	[Holotype: HNHM; ♂ Presidió (Praesidio), Sinaloa, Mexico]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0598FDD0FD1B96D6.taxon	discussion	This species is widespread throughout southwestern North America and has been reported in BC and BCS (Ayala et al. 1996) and Snelling (1974) reports C. atripes in BCS. We reviewed one male collected in the Central Desert in BCS in September 1941 (CASC). Additionally, the BBPT collected one male in the Magdalena Plains in March 2021 Magdalena Plains (MABC). See fig. 86.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0599FCD4FCAA9782.taxon	materials_examined	[Holotype: AMNH; ♂ Las Cruces, New Mexico, USA; May 10]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0599FCD4FCAA9782.taxon	discussion	Centris caesalpiniae is a new record in BC supported by one female specimen collected in Valle de los Cirios in the Central Desert by CARCIB team in July 2017. See fig. 86.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0599FC20FAE290CD.taxon	materials_examined	[Lectotype: USNM; ♀ New Mexico: Mesilla Valley; 18 May]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0599FC20FAE290CD.taxon	discussion	This species is widely distributed in xeric regions of the southwestern USA and northern Mexico. Specimens collected in the Gulf Coast in June 1921 and March 1991 are reported by the SEMC and CASC (GBIF 2023). The CARCIB team collected one specimen in the Gulf Coast in September 2016. Additionally, the BBPT collected specimens in the Gulf Coast in March 2021 (3 ♀, 2 ♂), in Magdalena Plains in March 2021 (1 ♀), in Vizcaíno Desert in March 2021 (5 ♀), and in Central Desert in March 2021 (1 ♂), and April 2023 (1 ♂), and in Lower Colorado Desert in June 2021 (1 ♂). Voucher specimens are in MABC (5 ♀, 3 ♂), and ECOAB (4 ♀, 2 ♂). See fig. 87.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0599FAECFD2491E5.taxon	materials_examined	[Holotype: LACM; ♀ Bahía San Francisquito, Baja California, Mexico; April 3, 1947]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0599FAECFD2491E5.taxon	discussion	This species is only known from the holotype specimen collected in San Francisquito, BC in 1947. We reviewed the Holotype vouchered in the LACM. See fig. 87.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0599FA04FB5092C5.taxon	materials_examined	[Holotype: CASC; ♂ La Paz, Baja California Sur, Mexico; June 29, 1919]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0599FA04FB5092C5.taxon	discussion	This species is endemic to the BCP. ASUHIC reports seven specimens collected in the Central Desert, Sarcocaulescent Shrubland, and Gulf Coast in July 1968 (SCAN 2023). There are also specimens in SEMC from the Gulf Coast Region collected in September 1983. The CARCIB team collected one female in the Gulf Coast in July 2017, and the BBPT team captured one female in the Vizcaíno Desert in March 2021 (MABC). See fig. 87.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0599F8FDFBBE93DC.taxon	materials_examined	[Holotype: LACM; ♂ 8.04 km NW San Ignacio, Mulegé, Baja California Sur, Mexico; October 11, 1972]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5B8AFC0599F8FDFBBE93DC.taxon	discussion	Centris fisheri is another endemic species of the BCP. This species had been recorded in the Sarcocaulescent Shrubland in September 1981 and the Gulf Coast by the INHS (iDigBio 2023). We reviewed the holotype collected in the Vizcaíno Desert in October 1972 (LACM). The CARCIB team extended the known distribution to BC by collecting it in July 2017 from Valle de los Cirios in the Central Desert. See fig. 88.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5D8AFA0599F94BFE949397.taxon	materials_examined	[Lectotype: USNM; ♂ College Farm, Mesilla Valley, New Mexico, USA; May 18, 1896]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5D8AFA0599F94BFE949397.taxon	discussion	This species is primarily found in the Sonoran, Mojave, and Chihuahuan Deserts, but it is also present in the CFP and the Madrean Archipelago. ASUHIC reports one male and female collected in the Lower Colorado Desert in June 1968 (SCAN 2023). The BBPT collected one female in the Coastal Sage Matorral in June 2020, and five females in the Chaparral in May 2022 and May 2023. Voucher specimens are in MABC (5 ♀), and ECOAB (1 ♀). See fig. 88.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5E8AF90599FF63FE0A95AE.taxon	materials_examined	[Lectotype: ANSP; ♀ Arizona: Phoenix; May 1898]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5E8AF90599FF63FE0A95AE.taxon	discussion	Centris pallida is the most abundant Centris species on the BCP. Preserved specimen records from the BCP are reported by ASUHIC (SCAN 2023) and INHS. The BBPT collected 88 specimens (59 ♂, 29 ♀) in Chaparral, Baja California Mountains, Lower Colorado Desert, Central Desert, Gulf Coast, and Sarcocaulescent Shrubland in 2017, 2019, 2021, and 2022 (Supplementary material 1). Voucher specimens are in MABC (30 ♂, 15 ♀), and ECOAB (29 ♂, 14 ♀). See fig. 89.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5E8AF80599F872FC6A9566.taxon	materials_examined	[Syntype: USNM; ♀ Mesilla Valley on the College Farm, New Mexico, USA; May 18, 1896]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF5E8AF80599F872FC6A9566.taxon	discussion	This species is widely distributed across southwestern USA, and northern Mexico. In BC, it is a common species in the Lower Colorado and Central Deserts. It can also be found in the Baja California Mountains, Chaparral, and the Coastal Sage Matorral. In BCS, it is present in the Gulf Coast and Magdalena Plains regions. Preserved specimen records from the BCP are published by the ASUHIC, OSUC, BBSL, and ANMH (GBIF 2023; SCAN 2023). The BBPT collected 49 specimens (31 ♂, 18 ♀) in 2019, 2020, 2021, and 2022 (Supplementary material 1). Voucher specimens are in MABC (16 ♂, 9 ♀), and ECOAB (15 ♂, 9 ♀). See fig. 89.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF558AF20599F9C3FBC4929A.taxon	materials_examined	[Type: ♂ Corpus Christi, Nueces Co., Texas, USA; March 18, 1908]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF558AF20599F9C3FBC4929A.taxon	discussion	D. piercei specializes on pollen from flowers in the family Cactaceae (Sipes & Tepedino 2005). Within the BCP, this species has only been sampled on Cedros Island in March 1983 (INHS). See fig. 96.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF608AC70598FDB3FF4B9732.taxon	materials_examined	[Lectotype: ANSP; ♂ California, USA]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF608AC70598FDB3FF4B9732.taxon	discussion	Eucera edwardsii is a species distributed throughout the western USA and northwestern Mexico. It has been reported in BC (Timberlake 1969; Ayala et al. 1996), and San Bernardino Valley, Sonora (Minckley & Radke 2021). As part of this study, the BBPT collected a female specimen in Guadalupe Valley during April 2022 (MABC). See fig. 103.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF608AC70599FA53FC869252.taxon	materials_examined	[Holotype: CASC; ♂ Indian Canyon, near Twentynine Palms, San Bernardino Co., California, USA; March 27, 1947]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF608AC70599FA53FC869252.taxon	discussion	Eucera mohavensis is found almost exclusively in the Sonoran and Mojave deserts. In BC, eight males were collected in San Felipe in 1963 (Timberlake 1969). Additionally, there are recent records from Mexico in the San Bernardino Valley, Sonora (Minckley & Radke 2021). See fig. 105.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF668AC10599FDB3FDED96EA.taxon	materials_examined	[Holotype: USNM; ♀ Berkeley, Alameda Co., California, USA; August 9, 1915]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF668AC10599FDB3FDED96EA.taxon	discussion	Melissodes robustior is found in western North America, including one BCP record from October 1972 from the Central Desert (GBIF 2023). See fig. 108.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF0C8AAB05F9FED3FB2E95AE.taxon	description	Bees in this genus are brood parasites in the nests of Calliopsis and Perdita (Michener 2007).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF0E8AA90598FB07FDB991BA.taxon	materials_examined	[Holotype: AMNH; ♀ Indian Truck Trail, 19.31 km S Corona, Riverside Co., California, USA; 24 May 1985] Brachynomada annectens is a brood parasite on bees in the genus Anthophorula (Snelling & Rozen 1987). This species inhabits the CFP in California, USA and BC, Mexico. Within BC, this species was reported by Hurd (1979) and confirmed by Ayala et al. (1996).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF008AA705F9FE9AFC2A95F6.taxon	description	All bees in the genus are brood parasites of Colletes (Michener 2007).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF008AA705F9FE9AFC2A95F6.taxon	description	Epeolus compactus Cresson, 1878 [Lectotype: ANSP; ♀ Texas, USA] Epeolus compactus is widely distributed from central Mexico to the plains of the central and western USA. Within the BCP, it has been reported in the Central Desert, Magdalena Plains, and Gulf Coast (Onuferko 2018). We reviewed one male collected in the Lower Colorado Desert in April 1939, and one male from the Coastal Sage Matorral collected in May 1938 (CASC). Additionally, the BBPT collected one female in Santa Ines within the Central Desert region in November 2020 (MABC). See fig. 130.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF1A8ABD05F9F8EDFAE8935B.taxon	description	We recognize the former genera Xeromelecta Linsley, 1939 under Brachymelecta as in Onuferko et al. (2021).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF1A8ABD05F9F8EDFAE8935B.taxon	description	Brachymelecta californica (Cresson, 1878) [Lectotype: ANSP; ♂ California, USA]	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF108AB705F9FE9AFD8596A2.taxon	description	Nomada are brood parasites on a wide variety of genera including Andrena and Panurgus (Andrenidae), Agapostemon, Halictus, Lasioglossum, and Lipotriches (Halictidae); Melitta (Melittidae), and Colletes (Colletidae) Michener (2007). Specimen identifications of this genus were made with reference to original descriptions, open access holotype images by the USNM (USNM, 2024), and series of reference specimens determined by R. R. Snelling, and A. Byron vouchered at CASC and LACM.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FF288A8F05F9FF2BFE1B963E.taxon	description	Leiopodus singularis (Linsley & Michener, 1937) * [Holotype: CASC; ♀ Albuquerque, New Mexico, USA; September 1 – 3, 1935] This species is distributed from Guatemala to California, USA. It is a brood parasite in the nests of bees in the tribe Emphorini Michener (2007). Leiopodus singularis represents a new species record for the BCP. The CARCIB team collected the first record for BCS in the Magdalena Plains in the Municipality of La Paz in April 2019. Additionally, the BBPT collected one female in May 2020 and one male in May 2022 in the Coastal Sage Matorral in BC (MABC). See fig. 149.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FEC78B6005F9FA3EFEF59276.taxon	description	All of the species in this genus reported here specialize on pollen from plants in the genus Phacelia Juss. (Timberlake 1961; Fowler 2020)	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FED98B7E05F9F8F2FD7893AB.taxon	description	Due to its complex taxonomy and the lack of a formal revision for all species from western North America, the species reported here are cited from the literature only.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FEDE8B7905F9F886FB6A93F3.taxon	description	Bees in this genus collect pollen exclusively from plants in the family Cactaceae (Michener 2007).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FEDE8B7905F9F886FB6A93F3.taxon	description	Lithurgopsis apicalis (Cresson, 1875) [Lectotype: ANSP; ♀ Colorado, USA] Lithurgopsis apicalis is the more abundant of the two species in this genus found in the BCP. There are preserved specimen records of this species at BBSL from the Magdalena Plains collected in July 1988 and Chaparral in May 1989 (GBIF 2023). We examined three males collected in the Baja California Mountains in Sierra Juarez in July 1980, Tropical Dry Forest in March 1986 (BBSL), and the Central Desert in March 2014 (CNIN). Additionally, the BBPT collected nine specimens in Coastal Sage Matorral (1 ♀, 1 ♂), Succulent Coastal Matorral (2 ♀), and in the Baja California Mountains in May 2022 (5 ♂). Voucher specimens are in MABC, and ECOAB. See fig. 193.	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
03F12042FEE68B4105F9F916FBEB9363.taxon	description	All bees in the genus are brood parasites on bees of the genus Megachile (Baker 1975).	en	Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric, Vandame, Rémy (2024): Revealing the Baja California Peninsula’s Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila). Zootaxa 5522 (1): 1-391, DOI: 10.11646/zootaxa.5522.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5522.1.1
