Lasioglossum (Dialictus) immigrans, Gardner & Gibbs, 2022

Gardner, Joel & Gibbs, Jason, 2022, New and little-known Canadian LasIOGLOssum (DIaLICTus) (Hymenoptera: Halictidae) and an emended key to species, The Canadian Entomologist (e 3) 154 (1), pp. 1-37 : 8-13

Lasioglossum (Dialictus) immigrans new species

ZooBank Registration # urn:lsid:zoobank.org:act:472373E0-2D3E-4C09-961C-DE937C034C71

Figures 3 , 5 , 10A

Material examined

Holotype. UNITED STATES – Arizona ♀; Pinal Co., intersection of 347 84 S. of Maricopa ; 32.875° N, 112.05° W; 8.iii.2018; T.J. Wood leg.; WRME.

[Verbatim label: USA: AZ: Pinal 8.iii.2018 / 347 × 84 intersection S. of Maricopa, 32.875 – 112.050, leg. T.J. Wood // BOLD / DLIII097-18 / gard0014-AZ // HOLOTYPE / Lasioglossum (Dialictus) immigrans Gardner and Gibbs // University of Manitoba / Wallis /Roughley Mus. Ent. / Winnipeg Manitoba / Canada R3T2N2 / WRME 0518492 ]

Paratypes. (See Supplementary material, Table S1 for complete data including coordinates and collection codes.)

CANADA – Manitoba 1♀; West Interlake , 4.5 km NNW of Ashern; 29.vi.2020; M. Martini leg.; WRME .

MEXICO – Coahuila 1♂; 41 km NE of San Pedro de las Colonias ; 26.iii.1992; R. Brooks leg.; SEMC 1♀; 5 km W of Ocampo ; 30.iii.1992; B. Alexander leg.; SEMC 3♀; Arteaga, San Antonio de las Alazanas ; 21.vii.2013; LRF & CVM leg.; LRF – Guanajuato 2♀, 2♂; 7 mi. NW of Leon ; 9.viii.1954; SEMC – Guerrero 1♀; Acapulco ; 28.vi.1956; R.E. Beer & party leg.; SEMC – Hidalgo 1♀; 11 mi. E of Pachuca ; 26.viii.1962; Naumann & Roberts leg.; SEMC 1♂; 22 mi. SW of Actopan ; 27.viii.1962; Ordway & Marston leg.; SEMC 1♂; 22.5 mi. SW of Actopan ; 27.viii.1962; N. Marston leg.; SEMC 3♀; 29.4 mi. SE of Zimapán ; 9.vii.1961; SEMC 2♀; 3 mi. W of Pachuca ; 24.vi.1953; SEMC 1♂; ibid.; 24.vi.1954; SEMC 1♂; 3.5 mi. NE of Tizayuca ; 28.viii.1962; SEMC 8♀; 4 mi. W of Pachuca ; 16.vi.1961; SEMC 3♂; 5 mi. N of Pachuca ; 25.viii.1962; Roberts & Naumann leg.; SEMC 1♂; 5 mi. W of Pachuca ; 26.viii.1962; Ellen Ordway leg.; SEMC 1♀, 1♂; Ixmiquilpan ; 23.vi.1953; SEMC 2♀, 1♂; Lagunilla ; 14.vi.1951; H.E. Evans leg.; SEMC 1♀; Pachuca ; 6.vii.1937; Mead & Embury leg.; SEMC 21♀, 26♂; ibid.; 24.vi.1953; SEMC 24♀, 14♂; ibid.; 24.vi.1954; SEMC 1♀, 1♂; ibid.; 28.vii.1954; SEMC 1♀; Tezontepec , 21 mi. SW of Actopan; 27.viii.1962; Ordway & Marston leg.; SEMC – Jalisco 1♀, 1♂; Lagos de Moreno ; 21.viii.1954; C.D. Michener & party leg.; SEMC – Nuevo Leon 1♀; 3.9 km NE of Iturbide ; 24.iii.1991; R. Brooks, R. Leschen leg.; SEMC 1♀; 37 km SW of Linares ; 21.iii.1991; R. Brooks, R. Leschen leg.; SEMC 1♀; 37 km SW of Linares, 4.8 km S on Bosque Escuela Road ; 22.iii.1991; R. Brooks, R. Leschen leg.; SEMC 3♂; 4 km S of Linares ; 22.iii.1991; R. Brooks, R. Leschen leg.; SEMC 3♀; 4.2 km S of Iturbide ; 23.iii.1991; R. Brooks, R. Leschen leg.; SEMC 1♀; ANP Corral de Bandidos, Garcia ; 11.vii.2009; LRF & CVM leg.; LRF 2♀; Carretera a Galeana 5 km al O de Puerto Pastores , Galeana ; 13.iv.2014; LRF & CVM leg.; LRF 1♀; Ejido San Juan del Prado , brecha a carretera 57, km 3; 3.iv.2013; LRF & CVM leg.; LRF 1♀; Galeana, Brecha Cerro El Potosi ; 4.iv.2013; LRF & CVM leg.; LRF 2♀; Pablillo ; 13.iv. 2014; LRF & CVM leg.; LRF – Oaxaca 3♀; 1.4 km SW of Puebla / Oaxaca border, Highway 125 km 58; 14.ix.1996; R. Brooks leg.; SEMC – Puebla 1♀; 1 km W of San Francisco de Acatepec on Highway 125 km 50.4; 14.ix.1996; R. Brooks leg.; SEMC 1♀; 4 mi. NW of Petlalcingo ; 4.vii.1953; SEMC 1♀; 5 km E of Cuacnopalan on Highway 1350; 12.ix.1996; R. Brooks leg.; SEMC 1♀; 8 mi. SE of Tehuitzingo ; SEMC 1♀; Axocopan ; 6.vii.2011; J. Gibbs leg.; WRME 1♀; San Francisco de Acatepec, Highway 125, km 54.5; 13.ix.1996; R. Brooks leg.; SEMC 8♀, 2♂; Tecamachalco ; 2.vii.1953; SEMC 1♂; Tehuacán ; 23.vi.1951; H.E. Evans leg.; SEMC – Querétaro 9♀, 3♂; 10 mi. E of San Juan del Rio ; SEMC – San Luis Potosi 1♀; 12 mi. NW of Nuevo Morelos ; 4.ix.1962; N. Marston leg.; SEMC 1♀; 20 mi. SW of San Luis Potosi; 25.vii.1962; SEMC 1♂; 5 mi. E of Ciudad del Maíz ; 22–23.viii.1954; SEMC 7♀; El Huizache ; 22.viii.1954; SEMC 1♀; El Salto Falls ; 17.vi.1956; R.E. Beer & party leg.; SEMC – Sonora 3♀; 30 km E of Agua Prieta ; 11.iv.2005; R.L. Minckley leg.; PCYU 3♀; ibid.; 22.iv.2005; R.L. Minckley leg.; PCYU 1♀; Rancho San Bernardino ; 21.iv.2005; A. Romero leg.; PCYU 1♀; ibid.; 21.iv.2005; RLM 1♀; ibid.; 27.iv.2005; R.L. Minckley leg.; PCYU 1♂; ibid.; 3.v.2005; R.L. Minckley leg.; PCYU 1♀; ibid.; 19.v.2005; R.L. Minckley leg.; PCYU – State of Mexico 1♀; 10 mi. N of Atlacomulco ; 18.viii.1954; SEMC 3♀; 10 mi. NW of Chico ; 12.viii.1951; SEMC 1♀; ibid.; 12.viii.1954; SEMC 1♂; 17 mi. N of Atlacomulco ; 18.viii.1954; C. D. Michener & party leg.; SEMC 1♀; Tepexpan ; 12.viii.1954; SEMC .

UNITED STATES – Arizona 1♀; Cochise Co., 0.7 mi. above (S of) Onion Saddle ; 5.ix.2009; J.S. Ascher leg.; AMNH 1♀; Cochise Co., 1 mi. E of Douglas ; 17.viii.2003; J.S. Ascher, J.G. Rozen, M.A. Rozen leg.; AMNH 1♀; Maricopa Co., 1100 W Mission Drive, Chandler; 27.iii.2017; S.J. Hall et al. leg.; ASUHIC 1♀; Cochise Co., 13 mi. SW of Apache ; 31.viii.1995; J.S. Ascher leg.; AMNH 1♀; Cochise Co., 14 mi. N of Douglas, road to Rucker Canyon ; 7.ix.2009; J.S. Ascher leg.; AMNH 1♀; Maricopa Co., 1414 E Libra Drive, Tempe; 3.v.2017; S.J. Hall et al. leg.; ASUHIC 1♀; Maricopa Co., 1926 E Calle De Caballos, Tempe ; 4.iv.2017; S.J. Hall et al. leg.; ASUHIC 1♀; Santa Cruz Co., 2 mi. W of Pena ˜Blanca Canyon ; 7.ii.1963; C.E. Mickel leg.; UMSP 1♀; Cochise Co., 3 mi. NW of Sunizona ; 21.viii.1995; J.G. Rozen & S.A. Budick leg.; AMNH 1♀; Maricopa Co., Apache Trail, 1 mi. E of Tortilla Flat; 12.iii.2018; T.J. Wood leg.; WRME 1♀; Greenlee Co., Apache-Sitgreaves National Forest, Hannagan Meadow ; 3.vii.2017; BBSL 1♀; ibid.; 7.viii.2017; BBSL 1♀; Cochise Co., Barfoot Junction ; 30.viii.1995; J.S. Ascher leg.; AMNH 2♂; Cave Creek , 5 mi. W of Portal; 27.vii.1955; Timberlake leg.; UCRC 1♀; Pinal Co., Copper Hill Wash nr. upper Canada ˜del Oro , 3 mi. SW Oracle; 11.ix.1962; C.E. Mickel leg.; UMSP 7♀, 3♂; Cochise Co., Coronado National Forest, Barfoot Park ; 12.vi.2017; BBSL 1♀; ibid.; 1.vii.2017; BBSL 1♀; Graham Co., Coronado National Forest, Hospital Flat Campground ; 13.vi.2017; BBSL 1♀; Cochise Co., Cottonwood Draw , 26 mi. E of Douglas; 6.ix.2011; J.G. Rozen, E.S. Wyman leg.; AMNH 1♀; Coconino Co., Highway 67 just N. of Grand Canyon National Park ; 22.vi.1999; L. Packer leg.; PCYU 1♀; Lonesome Valley, 15 miles from Prescott ; 3.vii.1937; Timberlake leg.; UCRC 1♀; Maricopa Co., Phoenix Mountain Preserve ; 5.iv.2017; S. J. Hall et al. leg.; ASUHIC 1♀; Pima Co., Pima Canyon, Santa Catalina Mountains ; 9.xi.1962; C.E. Mickel leg.; UMSP 1♀; Cochise Co., Pinery Canyon, W. side of Chiricahua Mountains ; 27.viii.2007; J.S. Ascher, C. Dong leg.; AMNH 1♂; Prescott ; 26.vii.1932; Timberlake leg.; UCRC 1♀; Cochise Co., Rustler Park ; 30.viii.1995; J.S. Ascher leg.; AMNH 5♂; Cochise Co., Southwestern Research Station ; 23.viii.2010; J.S. Ascher leg.; AMNH 2♀; Cochise Co., Southwestern Research Station , 5 mi. W of Portal; 16.viii.2007; J.S. Ascher leg.; AMNH 1♀; Pima Co., Tucson, Pima Canyon ; 7.iii.2018; T.J. Wood leg.; WRME 1♀; Maricopa Co., Usery Mountain Regional Park; 11.iii.2018; T.J. Wood leg.; WRME 1♀; Cochise Co., W. Turkey Creek, Chiricahua Mts. ; 2.ix.2003; J.G. Rozen, J.S. Ascher, R.L. Staff, & R.E. Edwards leg.; AMNH – New Mexico 1♀; Sierra Co., #4, 6 mi. W of Caballo ; 30.v.1991; G.W. Byers leg.; SEMC 1♂; Hidalgo Co., 15 km N of Rodeo ; 18.vi.1993; R.L. Minckley leg.; SEMC 1♀, 1♂; Hidalgo Co., 26 mi. S of Animas ; 18.ix.2012; J. Gibbs leg.; WRME 1♀; Hidalgo Co., 28 mi. S of Animas ; 30.viii.2010; J. Gardner leg.; UMSP 1♂; Carrizozo ; 9.vi.1950; L. D. Beamer leg.; SEMC 2♀; Bernalillo Co., Cibola National Forest, Kiwanis Meadow ; 22.vi.2017; BBSL 1♀; ibid.; 4.viii.2017; BBSL 1♀; Socorro Co., Cibola National Forest, South Baldy Meadow ; 16.vi.2017; BBSL 1♀; ibid.; 17.vi.2017; BBSL 4♀; ibid.; 29.vii.2017; BBSL 1♀; Corona ; 8.vi.1950; L.D. Beamer leg.; SEMC 1♀; Hidalgo Co., near Rodeo ; 23.iii.1970; O.R. Taylor & party leg.; SEMC 1♀; Hidalgo Co., Rodeo ; 11.viii.1975; M. Chabot leg.; SEMC 1♀, 1♂; Lincoln Co., Ruidoso ; 10.vii.2007; Gibbs & Sheffield leg.; CMNC 2♀; ibid.; 10.vii.2007; Gibbs & Sheffield leg.; PCYU 1♀; San Miguel Co., Santa Fe National Forest, Jack’ s Creek Campground ; 19.vi.2017; BBSL 1♀; Socorro Co., Sevilleta NWR-C5S; 15–29.vii.2003; K. Wetherill leg.; PCYU 1♀; Socorro Co., Sevilleta NWR-S5; 2.vi.2007; K. Wetherill leg.; PCYU 1♂; Eddy Co., Slaughter Canyon parking lot; 2.vi.2010; A. Druk leg.; BBSL 1♂; ibid.; 2.vi.2010; J.D. Herndon leg.; BBSL 1♀; Eddy Co., Slaughter Canyon, 0.4 km NE by N Slaughter Cave ; 12.vii.2010; J.D. Herndon, A. Druk leg.; BBSL 1♀; Sandoval Co., Valles Caldera National Preserve ; 9.viii.2017; BBSL 1♀; Eddy Co.; 13.vii.2010; J.D. Herndon, A. Druk leg.; BBSL 1♂; ibid.; 23.viii.2010; R. Krauss leg.; BBSL 1♂; 10.vi.2011; J.D. Herndon leg.; BBSL – Texas 1♀; Alpine ; 28–30 Jun.; Wickham leg.; AMNH 1♀; Jeff Davis Co., Highway 166 west of Mount Livermore ; 24.v.1997; L. Packer leg.; PCYU 1♀; Jeff Davis Co., Madera Canyon, Davis Mountains ; 1.vii.1948; C. & P. Vaurie leg.; AMNH 3♀; Brewster Co.; 1 May ; H. W. Ikerd leg.; BBSL 2♀; ibid.; 30 Apr. ; H.W. Ikerd leg.; BBSL – Utah 1♀; Washington Co., 0.28 mi. NNE of Spendlove Knoll ; 22.vi.2006; B. Hays, F. Nicklen leg.; BBSL 1♀; Washington Co., 0.4 mi. NE of Spendlove Knoll ; 13.vi.2006; B. Hays, F. Nicklen leg.; BBSL 1♀; Iron Co., 2 mi. E of Cedar City ; 20.vi.1999; L. Packer leg.; PCYU 1♀; Washington Co., Baker Dam ; 19.vi.1999; L. Packer leg.; PCYU .

Diagnosis. Females of Lasioglossum immigrans can be recognised by the combination of acarinarial fan present but extremely weakly developed (composed of only a few sparse suberect hairs; Fig. 5A ), propodeum with strong oblique carina, mesoscutum and mesepisternum coarsely and densely punctate (IS <1 PD in large part), frons punctures much smaller and denser than paraocular area punctures, and T1 dorsal surface moderately densely and distinctly punctate (IS = 1–2 PD). They are most similar to L. comulum Michener, 1951 , L. dispersum Gibbs, 2018 , L. strigosigena Michener, 1954 , and a complex of several undescribed species from Mexico. Females of all but one of these species have the acarinarial fan well-developed with dense appressed hairs ( Fig. 5B ). The only known species with the acarinarial fan weakly developed as in L. immigrans is an undescribed Neotropical species from Veracruz, Mexico; this species has the frons punctures as large and dense as the paraocular area punctures. In addition, females of L. comulum have the T1 dorsal surface more finely and sparsely punctate (IS = 1–3 PD). In Canada, female L. immigrans may be confused with L. rufulipes and L. knereri . Females of L. rufulipes have the mesosoma punctures finer and sparser (IS = 1–2 PD) and no acarinarial fan (T1 anterior surface with evenly distributed erect hairs). Females of L. knereri have the propodeum lacking an oblique carina and have a well-developed acarinarial fan with dense appressed hairs (although often worn).

Males of Lasioglossum immigrans can be recognised by the face with very sparse tomentum not obscuring the surface, T1 anterior surface with no appressed hairs, depressed apical rims of metasomal terga usually punctate basally, mesoscutum and mesepisternum very coarsely and densely punctate (IS = 0 PD in large part, sparser (IS = 1–2 PD) on mesoscutum medially), propodeum lateral surface and often dorsolateral slope shiny and distinctly punctate, and integument blue on head and mesosoma, otherwise black to dark brown including tarsi and ventral surface of antennae. They are most similar to L. dispersum and a complex of several undescribed species from Mexico. They are probably also similar to L. comulum and L. strigosigena , although males of these species have not been definitively associated with females. Males of these similar species have the T1 anterior surface with at least a few appressed hairs (resembling the acarinarial fan of female L. immigrans ), mesoscutum more sparsely punctate, and/or depressed apical rims of metasomal terga impunctate. In Canada, male L. immigrans are most similar to L. punctatoventre , which have the propodeum lateral surface and dorsolateral slope rugulose.

Description

Female. Colouration: Head and mesosoma blue–green to olive green; clypeus apex black; labrum black; mandible black with red apex; flagellum black dorsally, dark brown ventrally; pronotal lobe black; metasoma black to dark reddish brown with rims of terga and sterna narrowly translucent yellowish; legs black to dark reddish brown; tegula dark brown; wing membrane hyaline, veins brown to dark brown.

Pubescence: Body hair colour pale yellow on dorsum of head and mesosoma, otherwise white. Tomentum dense on pronotal collar and lobe and space between pronotal lobe and tegula; sparse on T2–T3 basolaterally and T4–T5 throughout. Mesoscutum hair moderately plumose. Wing hairs dark, short, and dense. Acarinarial fan complete but very weak, with only a few sparse, suberect hairs. T2 fringes sparse, T3 fringes sparse.

Surface sculpture: Clypeus shiny, with punctures dense in basal fourth (IS ≤ 1 PD), large and irregularly spaced apically (IS <3 PD); supraclypeal area shiny, becoming weakly tessellate marginally, with punctures sparse (IS = 1–3 PD); paraocular area shiny, becoming weakly imbricate around antenna socket, with punctures dense (IS <1 PD), irregularly sparser around antenna socket (IS <2 PD); frons reticulate, with punctures crowded (IS = 0 PD); vertex shiny, with punctures crowded laterally (IS = 0 PD), sparse and obscure medially (IS = 1–2 PD); gena shiny, with punctures moderately dense (IS = 1–2 PD); postgena shiny; tegula punctures absent; mesoscutum tessellate, becoming shiny posteromedially, with punctures dense (IS <1 PD), becoming crowded laterally and posteriorly (IS = 0 PD) and moderately sparse anteromedially (IS = 1–2 PD); scutellum shiny, with punctures crowded (IS = 0 PD), becoming sparser submedially (IS ≤ 1 PD), diversopunctate; metanotum finely rugulose; metapostnotum imbricate, with rugae strong, subparallel, nearly reaching posterior margin; preëpisternum areolate–rugose; hypoepimeron imbricate, with punctures crowded (IS = 0 PD); mesepisternum imbricate, with punctures crowded (IS = 0 PD), becoming irregularly sparser below scrobal groove (IS <2 PD); metepisternum rugulose; propodeum lateral surface rugulose anteriorly, becoming tessellate posteriorly, posterior surface tessellate with weak vertical striae; T1 anterior slope coriarious, disc shiny, with punctures moderately dense (IS = 1–2 PD), impunctate in large apicolateral boss and on rim medially; T2 disc shiny, with punctures dense (IS ≤ 1 PD), apical rim weakly coriarious, with punctures moderately dense (IS = 1–2 PD).

Structure: Face length/width ratio 0.79 (± 0.01 standard deviation). Clypeus projecting ∼ 67% below suborbital tangent; apicolateral denticles low rounded knobs. Gena/eye width ratio 1 (± 0.05 standard deviation). Pronotal angle obtuse; forewing with three submarginal cells; tegula shape normal. Intertegular distance 1.1 (± 0.07 standard deviation) mm. Propodeum lateral carinae nearly reaching dorsal margin; oblique carina strong, straight. T2 depressed apical rim length about 50% of tergum (n = 10).

Male. Colouration: Head and mesosoma blue; clypeus apex colour black; labrum black; mandible black with red apex; flagellum dark reddish brown dorsally, orange ventrally; pronotal lobe black; metasoma black with rims of terga and sterna and downcurved lateral areas of terga becoming broadly translucent brown; legs black to dark reddish brown; tegula dark brown; wing membrane hyaline, veins with subcosta dark brown, otherwise brown to light brown.

Pubescence: Body hair colour white. Tomentum sparse on face below eye emargination, pronotal angle and lobe, and space between pronotal lobe and tegula. Mesoscutum hair thin to moderately plumose. Sterna hair long (1–3 OD), plumose, dense and erect. Wing hairs dark, short and sparse.

Surface sculpture: Clypeus shiny, with punctures dense (IS <1 PD); supraclypeal area shiny, with punctures dense (IS ≤ 1 PD); paraocular area shiny, with punctures dense (IS <1 PD); frons reticulate, with punctures crowded (IS = 0 PD); vertex shiny, with punctures dense laterally (IS <1 PD), moderately sparse and obscure medially (IS = 1–2 PD); gena shiny, with punctures dense (IS ≤ 1 PD); postgena shiny; tegula punctures absent; mesoscutum shiny, with punctures moderately dense (IS = 1–2 PD), becoming crowded laterad of parapsidal lines and on posterior margin (IS = 0 PD); scutellum shiny, with punctures sparse (IS = 1–3 PD), becoming dense marginally (IS <1 PD); metanotum shiny and densely punctate (IS <1 PD); metapostnotum imbricate, with rugae strong, anastomosing, reaching posterior margin; preëpisternum areolate; hypoepimeron shiny, with punctures crowded (IS = 0 PD); mesepisternum shiny, with punctures crowded (IS = 0 PD); metepisternum rugose; propodeum lateral surface tessellate, with punctures crowded anteriorly (IS = 0 PD), becoming irregularly sparser posteriorly (IS <2 PD), posterior surface shiny and densely punctate (IS ≤ 1 PD); T1 anterior slope shiny, disc shiny, with punctures moderately dense (IS = 1–2 PD), impunctate on rim medially; T2 disc shiny, with punctures dense (IS ≤ 1 PD), apical rim shiny, with punctures moderately dense (IS = 1–2 PD), absent apicomedially.

Structure: Face length/width ratio 0.82 (± 0.01standard deviation). Gena/eye width ratio 0.88 (± 0.04 standard deviation). F1:pedicel length ratio 1.06 (± 0.09 standard deviation); F2:F1 length ratio 1.91 (± 0.11 standard deviation); F2 length/width ratio 1.51 (± 0.14 standard deviation). Pronotal angle obtuse; forewing with three submarginal cells; tegula shape normal. Intertegular distance 0.89 (± 0.04 standard deviation) mm. Propodeum lateral carinae not reaching dorsal margin; oblique carina absent (n = 10).

Genitalia: As in Figure 4E–F . Gonocoxite broad, truncate apically. Gonostylus subrectangular apically, with a raised subcircular area at base dorsally, this area bearing a few long hairs. Retrorse lobe relatively narrow (about 3.5 times as long as broad) with sparse short hair except in subcircular glabrous area apically.

Etymology. The specific epithet immigrans is a Latin present participle meaning “migrating”. It refers to the disjunct population in Manitoba, Canada and its occurrence in three countries. It is meant to honour the diverse human immigrants and refugees who come to Canada and the United States of America from other nations and contribute to a stronger society.

Range. Mountains from Utah, United States of American to Oaxaca, Mexico, with disjunct records in Manitoba, Canada and Acapulco, Mexico ( Fig. 10A ).

Floral hosts. Broadly polylectic (Supplementary material, Table S2).

DNA barcodes. 17 sequences available (BOLD process IDs: BBHYG462-10, DIAL1164-07, DIAL1165-07, DIAL1167-07, DIAL1168-07, DLII546-07, DLII789-07, DLII791-07, DLII843- 07, DLII844-07, DLII845-07, DLII976-07, DLII978-07, DLII1267-08, DLII1332-08, DLIII097- 18, HYMBB815-09). A very small amount of divergence occurs among these sequences (maximum P -distance 0.31%). The nearest known neighbour is L. dispersum Gibbs, 2018 from Puerto Rico. The minimum P -distance to L. dispersum is 3.06% and to the morphologically similar L. comulum is 4.69%.

Comments. Common in the southwestern United States of America and Mexico; rare in Canada. Lasioglossum immigrans has been frequently confused with L. comulum in collections. The true L. comulum is comparatively rare in the United States of America but may be more common in Mexico.

Figures

Fig. 3. Lasioglossum immigrans new species (♀): A, lateral habitus (holotype); B, face, mesoscutum, and T1 anterior slope (Manitoba specimen); and C, propodeum and metasoma (Manitoba specimen). Scale bars: 1 mm.

Fig. 5. T1 anterior slope and acarinarial fan of female: A, Lasioglossum immigrans new species, with fan weakly developed and T1 deeply punctate; and B, Lasioglossum comulum Michener, 1951, with fan well-developed andT1 finely punctate.

Fig. 10. Georeferenced collection records (black squares) and predicted distribution by maximum entropy ecological niche modelling in Maxent (colour shading). Warmer colours indicate higher cloglog probability of occurrence. A, Lasioglossum immigrans; and B, L. onuferkoi. Duplicate records within 0.1 degree were pruned to reduce bias in A, but only exact duplicates were pruned in B owing to the small number of records.

Fig. 4. Lasioglossum immigrans new species (♂): A, dorsal habitus; B, lateral habitus; C, face; D, propodeum and metasoma; E, genital capsule (dorsal view with gonostylus parallel to plane of vision); and F, retrorse lobe (lateral view parallel to plane of vision). Scale bars: A–D, 1 mm; E–F, 0.25 mm.