taxonID	type	description	language	source
941087F1CB4AFFF3DF524EE1FC3FCBD5.taxon	diagnosis	Diagnosis In eastern Asia, the species of Hemihalictus series are classified into four subgenera (Acanthalictus, Dialictus, Hemihalictus, and Sphecodogastra). The subgenus Hemihalictus is separated from the other three subgenera by the following key:	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB4AFFF3DF524EE1FC3FCBD5.taxon	discussion	Three species, L. (Sphecodogastra) boreale Svensson, Ebmer & Sakagami, 1977, L. (S.) solisortus Ebmer & Maeta, 1994, and L. (S.) subtropicum Sakagami, Miyanaga & Maeta, 1994, from Japan are similar to L. (Hemihalictus) by having the posterior surface of the propodeum with an incomplete lateral carina (sometimes as variation) (Murao & Tadauchi 2007). However, these species can be separated from L. (Hemihalictus) by the mesepisternum with coarse reticulate-rugulae.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB49FFFFDFD94893FC5DCD60.taxon	diagnosis	Diagnosis Species of the sexstrigatus group are characterized by a combination of the following characters: 1) male antenna short, not reaching metasoma (Fig. 2 A); 2) male labrum with well-developed basal elevation (Fig. 2 B) (except for Lasioglossum (Hemihalictus) ohei Hirashima & Sakagami, 1966); 3) male labrum with distal process (Fig. 2 B); 4) male head with genal process as variation (Fig. 2 C – D); 5) female mesepisternum reticulate-punctate on lower area (Fig. 2 E); 6) mesepisternum without tubercle in both sexes; 7) female metasomal terga with distinct fimbriae on posterior margin (Fig. 2 F) (except for L. (H.) sphecodicolor Sakagami & Tadauchi, 1995); 8) male S 8 with well-developed (over S 7) median process (Fig. 3 A); 9) gonobase ventral arms of male genitalia connected with each other at upper ends (Fig. 3 C); 10) gonocoxite of male genitalia smooth (Fig. 3 B – D); 11) gonostylus of male genitalia small and simple, bud-like (Fig. 3 B – C); and 12) the ventral retrorse lobe of male genitalia not reaching gonobase (Fig. 3 B – C). The Japanese species of Hemihalictus are classified into five species groups (nitidiusculum, japonicum, semilucens, sexstrigatus, and villosulum groups). The sexstrigatus group is separated from the other four groups by the male head with genal process, the female metasomal terga generally with distinct fimbriae on posterior margin, and male S 8 with developed median process.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB49FFFFDFD94893FC5DCD60.taxon	description	Variation (male cephalic polymorphism) The members of sexstrigatus group except for Lasioglossum (Hemihalictus) frigidum Sakagami & Ebmer, 1996 display male cephalic polymorphism (Sakagami et al. 1966; Ebmer et al. 1994; Sakagami & Ebmer 1996; Murao et al. 2010). This polymorphism is caused by the allometric development of the head (Sakagami et al. 1966). The presence of a genal process is characteristic of the sexstrigatus group, but is not known from the japonicum group (Sakagami et al. 1966; Ebmer et al. 1994; Sakagami & Tadauchi 1995; Murao et al. 2010). Male cephalic polymorphism with allometric variation is known to occur in various bee families such as Andrenidae Latreille, 1802, Colletidae Lepeletier, 1841, and Halictidae Thomson, 1869 (summarised in Danforth et al. 2019). It also appears that such male cephalic polymorphism often occurs in communal species (Maeta 2000; Danforth et al. 2019). In the Japanese species of the sexstrigatus group, L. (H.) ohei has indeed been reported as a communal species (Sakagami et al. 1966). The other Japanese species with male cephalic polymorphism may also be communal.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB49FFFFDFD94893FC5DCD60.taxon	distribution	Distribution This group is distributed from the Palearctic to northern Oriental Region. It is diverse in eastern Asia.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB49FFFFDFD94893FC5DCD60.taxon	discussion	Comments Lasioglossum sexstrigatum was originally described as Halictus sexstrigatus by Schenck. From the scientific name ‘ - strigatus’, the original spelling was retained in accordance with Article 31.2.2 of the ICZN (International Commission on Zoological Nomenclature) Code.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB49FFFFDFD94893FC5DCD60.taxon	discussion	The following 10 species were included as members of the sexstrigatus group sensu Sakagami & Ebmer (1996), Pesenko (2007 a), and Murao et al. (2010) in Japan (Ebmer et al. 1994; Pesenko 2007 b; Murao et al. 2010): 1) Lasioglossum (Hemihalictus) bicornutum Murao, 2010, 2) L. (H.) canaliculatum Murao, 2010, 3) L. (H.) donanense Murao, 2010, 4) L. (H.) japonicum (Dalla Torre, 1896), 5) L. (H.) kankauchare (Strand, 1914), 6) L. (H.) latifacies Murao, 2010, 7) L. (H.) silivicolum Murao, 2010, 8) L. (H.) urumaense Murao, 2020, 9) L. (H.) yonaguniense Murao, 2010, and 10) L. (H.) zipangu Ebmer & Sakagami, 1994. As stated above, these species, except for L. (H.) bicornutum, L. (H.) kankauchare, L. (H.) latifacies, and L. (H.) silvicolum, form a separate clade as the japonicum group (Fig. 1). Both L. (H.) latifacies and L. (H.) silvicolum are included in the japonicum group because males (undescribed) of both species share a non-homoplasious syapomorphy of this group (Murao unpublished). The Japanese specimens of L. (H.) kankauchare recorded by Blüthgen (1925, as Halictus kankaucharis) have been preserved in ZMHB. I visited ZMHB in 2012 to examine the bee specimens from the Oriental Region. At that time, I also examined the Japanese specimens of L. (H.) kankauchare. As a result, the Japanese specimens of L. (H.) kankauchare recorded by Blüthgen (1925) proved to be a misidentification of L. (H.) japonicum. Comments on non-Japanese species excluded from the sexstrigatus group Lasioglossum (Hemihalictus) micante (Michener, 1993) endemic in Taiwan belongs to the sexstrigatus group sensu Sakagami & Ebmer (1996), Pesenko (2007 a) and Murao et al. (2010) (Michener 1993). According to Michener (1993), a male (holotype) of L. (H.) micante (female unknown) lacks both the genal process of the head and the median process of S 8. This species probably belongs to a different species group in the sexstrigatus group. However, since only a male of this species is known, future taxonomic studies of the genus Lasioglossum in Taiwan will be necessary.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB45FFFFDCD04ECFF9D4C9ED.taxon	description	Fig. 18 D	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB45FFFFDCD04ECFF9D4C9ED.taxon	diagnosis	Diagnosis Females are similar to Lasioglossum (Hemihalictus) taeniolellum (Vachal, 1903) but differ by the labrum without lateral projection on distal process (Murao et al. 2010: fig. 1 m) and mesepisternum with shallow PP on upper area (Murao et al. 2010: fig. 1 f). In contrast, in L. (H.) taeniolellum, the distal process of labrum has a horn-like lateral projection (Fig. 14 D) and a mesepisternum with deep PP on the upper area.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB45FFFFDCD04ECFF9D4C9ED.taxon	distribution	Distribution Japan (central Ryukyus: Amami-Ohshima Is., Kikai-jima Is., and Tokuno-shima Is.).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB45FFFFDCD04ECFF9D4C9ED.taxon	description	Flight records Female: March to October. Male: May to September (Murao et al. 2010). Flower records Thirteen species in 9 families were reported as floral records by Murao et al. (2010). Habitat This species has been collected from cultivated and urban areas at low elevations and seaside wasteland (Murao et al. 2010).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB44FFF8DCC04C62F9E1CAD6.taxon	diagnosis	Diagnosis Females are similar to Lasioglossum (Hemihalictus) epicinctus (Strand, 1914) from Taiwan. According to Sakagami & Ebmer (1996), the differences between L. (H.) frigidum and L. (H.) epicinctus are not clearly described. The type specimen of L. (H.) epicinctus at the Senckenberg Deutsches Entomologisches Institut (Müncheberg, Germany) was examined in 2012. Based on this examination, the female of L. (H.) frigidum is separated from L. (H.) epicinctus by the supraclypeal area dimly shiny (IS weakly tessellate), the ridges of metapostnotum long, nearly reaching the posterior margin as in Fig. 4 F, and the lineolation of T 1 present over the entire surface (Fig. 15 A). In contrast, in L. (H.) epicinctus, the supraclypeal area weakly shiny (IS nearly smooth), the ridges of metapostnotum short (only present on basal area), and the lineolation of T 1 present on basal and apical areas.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB44FFF8DCC04C62F9E1CAD6.taxon	materials_examined	Material examined Paratypes JAPAN – Hokkaido • 2 ♀♀; Abashiri-district, Hamakoshimizu; 19 Jun. 1967; H. Fukuda and K. Yamauchi leg.; MNHAH. – Honshu • 1 ♀; Aomori Pref., Misawa, Amagamori; 16 Aug. 1986; M. Yamada leg.; MNHAH • 1 ♀; Ibaraki Pref., Muramatsu; 13 May 1981; M. Takahashi leg.; MNHAH. Other material JAPAN – Honshu • 1 ♀; Tottori Pref., Yumiga-hama; 8 Aug. 1993; Y. Maeta leg.; MNHAH • 1 ♀; same location as for preceding; 6 Sep. 1993; Y. Maeta leg.; MNHAH • 1 ♂; Shimane Pref., Izumo-shi, Sotozono-cho; 12 Jul. 1994; Y. Maeta and K. Minagi leg.; SULE • 1 ♂; same location as for preceding; 10 Jun. 1995; Y. Maeta and K. Minagi leg.; SULE. – Kyushu • 2 ♀♀; Fukuoka Pref., Itoshima-shi, Shima-machi, Nigino-hama; 33 ° 35 ′ 22.329 ″ N, 130 ° 8 ′ 8.868 ″ E; 17 Aug. 2013; R. Murao leg.; ELKU • 1 ♂; same location as for preceding; 12 Jul. 2014; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 6 Jun. 2015; R. Murao leg.; ELKU • 1 ♀; Fukuoka Pref., Fukuoka-shi, Nishi-ku, Imazunagahama; 33 ° 36 ′ 37.64 ″ N, 130 ° 15 ′ 34.919 ″ E; 2 Jul. 2006; R. Murao leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 28 Jun. 2009; R. Murao leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 2 Aug. 2009; R. Murao leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 16 Aug. 2011; R. Murao leg.; ELKU • 3 ♀♀; same location as for preceding; 29 Jun. 2013; R. Murao leg.; ELKU • 6 ♂♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 29 Jun. 2013; Y. Murao leg.; ELKU • 4 ♂♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 17 Aug. 2013; R. Murao leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 17 May 2014; R. Murao leg.; ELKU • 2 ♀♀; Fukuoka Pref., Fukuoka-shi, Nishi-ku, Ikino-matsubara; 33 ° 34 ′ 51.671 ″ N, 130 ° 18 ′ 1.335 ″ E; 8 Jul. 2013; R. Murao leg.; ELKU • 1 ♀; Fukuoka Pref., Fukuoka-shi, Higashi-ku, Shikano-shima, Gebaga-hama; 33 ° 40 ′ 57.566 ″ N, 130 ° 17 ′ 18.933 ″ E; 20 Sep. 2012; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 15 Aug. 2013; R. Murao leg.; ELKU • 1 ♀; Fukuoka Pref., Kasuya-gun, Shingu-machi, Shingu-hama; 33 ° 43 ′ 8.861 ″ N, 130 ° 26 ′ 15.07 ″ E; 29 Jul. 2006; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 14 Oct. 2007; R. Murao leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; same location as for preceding; 10 May 2009; R. Murao leg.; ELKU • 39 ♀♀; same location as for preceding; 3 Jun. 2011; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 16 Jul. 2011; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 20 Sep. 2012; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 4 May 2014; R. Murao leg.; ELKU • 3 ♀♀; Fukuoka Pref., Fukutsu-shi, Koinoura-kaigan; 33 ° 48 ′ 00.327 ″ N, 130 ° 27 ′ 02.674 ″ E; 2 May 2015; R. Murao leg.; ELKU • 5 ♀♀; Kumamoto Pref., Amakusa, Tomioka-shiki; 19 Jun. 1931; Esaki and Hori leg.; ELKU. – Ryukyus • 1 ♀; Kagoshima Pref., Ôsumi-shotô, Tanega-shima, Hamada; 2 Aug. 1984; Sk. Yamane leg.; KWC • 1 ♀; Tanega-shima Is., Nakatane, Yakutsu; 14 Aug. 1991; M. Goubara leg.; SULE.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB44FFF8DCC04C62F9E1CAD6.taxon	distribution	Distribution Japan (Hokkaido, Honshu, Izu-shotô Islands, Shikoku, Kyushu, northern Ryukyus).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB44FFF8DCC04C62F9E1CAD6.taxon	description	Flight records Female: April to October. Male: June to October. The flight records of male are based on the phenological data reported by Minagi et al (2000). Flower records	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB44FFF8DCC04C62F9E1CAD6.taxon	discussion	Five species in 4 families were reported as floral records in Japan by Sakagami & Ebmer (1996), 8 species in 5 families by Minagi et al. (2000), and 5 species in 4 families by Gôukon (2006). The total number of species including my data is 14 in 6 families as follows. Apiaceae: Coelopleurum gmelinii (DC.) Ledeb.; Glehnia littoralis F. Schmidt ex Miq. Asteraceae: Hieracium umbellatum L.; Ixeris repens (L.) A. Gray; Melanthera prostrata (Hemsl.) W. L. Wagner & H. Rob.; Sonchus brachyotus DC.; Taraxacum officinale Weber ex F. H. Wigg. Brassicaceae: Arabis stelleri DC. var. japonica (A. Gray) F. Schmidt; Brassica sp. Convolvulaceae: Calystegia soldanella (L.) R. Br.; Cuscuta campestris Yunck. Lamiaceae: Vitex rotundifolia L. f. Rosaceae: Potentilla chinensis Ser.; Rosa rugosa Thunb.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB44FFF8DCC04C62F9E1CAD6.taxon	description	Habitat Lasioglossum frigidum has been collected only in coastal sand dunes. One of the collecting sites is shown in Fig. 19 D.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB42FFE4DCAF4991FAABCCFB.taxon	description	urn: lsid: zoobank. org: act: 2 F 66 A 01 B- 2176 - 4764 - 8 DB 7 - 59 D 53 A 335 FB 5 Figs 5, 15 B, 18 D, 20 B	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB42FFE4DCAF4991FAABCCFB.taxon	diagnosis	Diagnosis Females are similar to Lasioglossum (Hemihalictus) smilodon Ebmer & Sakagami, 1994 from Japan but are separated from them by the supraclypeal area shinier (IS weakly tessellate), the PP on the mesoscutum sparser (IS = 3 d in maximum) (Fig. 5 E), and T 1 with very weak lineolation. In contrast, in L. (H.) smilodon, the supraclypeal area is dimly shiny (IS distinctly tessellate), the PP on the mesoscutum denser (IS = 2 d at maximum) (Fig. 9 E), and the lineolation of T 1 clearer.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB42FFE4DCAF4991FAABCCFB.taxon	etymology	Etymology The specific name is dedicated to Dr Shuichi Ikudome (KWC), who contributed greatly to clarify the bee fauna of Ryukyus Islands, southwestern Japan.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB42FFE4DCAF4991FAABCCFB.taxon	materials_examined	Material examined Holotype JAPAN – Ryukyus • ♀; Okinawa Pref., Miyako-jima, Henna-zaki; 3 Jul. 1992; S. Ikudome leg.; ELKU. [Verbatim label: MIYAKO-JIMA / Henna-zaki / Okinawa Pref. / 3. VII. 1992 / S. Ikudome leg. // HOLOTYPE // Lasiioglossum (Hemihalictus) ikudomei Murao] Paratypes JAPAN – Ryukyus • 1 ♀; Yoron Is., Maeno-hama; 4 Jun. 1989; KWC • 1 ♀; Okinawa Pref., Kunigami, Hedo; 5 Apr. 1979; K. Kusigemati leg.; ELKU • 2 ♀♀; Okinawa Pref., Hedo; 5 Apr. 1979; K. Ohara leg.; ELKU • 2 ♀♀; Okinawa Pref., Kunigami-gun, Kunigami-son, Cape Hedo; 26 ° 52 ′ N, 128 ° 15 ′ E; 2 Apr. 2017; K. Otsui leg.; cMur • 1 ♀; Okinawa Pref., Okinawa-jima, Kunigami-gun, Kunigami-son, Ada; 22 Aug. 2007; Y. Nishimura leg.; cMur • 1 ♀; Miyako Is., Nishi-heana; 27 Mar. 1995; T. Matsumura leg.; ELKU • 1 ♂; Okinawa Pref., Miyako-jima, Henna-zaki; 3 Jul. 1992; S. Ikudome leg.; ELKU • 1 ♀; Okinawa Pref., Iriomote Is.; 16 – 17 Mar. 2005; Y. Maeta leg.; SULE.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB42FFE4DCAF4991FAABCCFB.taxon	description	Description Female MEASUREMENTS (n = 5, unit mm). BL = 5.13 – 5.63 (5.43 ± 0.23), WL = 4.25 – 4.88 (4.65 ± 0.26), HL = 1.55 – 1.65 (1.61 ± 0.04), HW = 1.48 – 1.65 (1.57 ± 0.06), IOD = 0.26 – 0.29 (0.28 ± 0.02), OOD = 0.24 – 0.31 (0.26 ± 0.02), OCD = 0.18 – 0.19 (0.19 ± 0.01, n = 4), UOD = 0.94 – 1.03 (0.98 ± 0.04), MOD = 1.10 – 1.23 (1.15 ± 0.05), LOD = 0.84 – 0.94 (0.88 ± 0.04), IAD = 0.15 – 0.16 (0.16 ± 0.01), AOD = 0.26 – 0.31 (0.28 ± 0.02), CAL = 0.29 – 0.32 (0.31 ± 0.01), CPL = 0.34 – 0.37 (0.35 ± 0.01), EL = 1.75 – 1.85 (1.80 ± 0.04), EW = 0.39 – 0.45 (0.41 ± 0.04), GW = 0.29 – 0.39 (0.35 ± 0.04), SPL = 0.61 – 0.66 (0.64 ± 0.02), F 1 L = 0.10 (0.10 ± 0.00), F 2 L = 0.08 (0.08 ± 0.00), F 3 L = 0.08 (0.08 ± 0.00), F 2 W = 0.13 – 0.15 (0.14 ± 0.01), MsW = 1.80 – 2.05 (1.93 ± 0.09), SCL = 0.38 – 0.45 (0.43 ± 0.03), MNL = 0.25 – 0.30 (0.27 ± 0.02), MPL = 0.25 – 0.33 (0.28 ± 0.03), MtW = 1.75 – 2.10 (1.97 ± 0.13). COLORATION. Body black except for the following parts: mandible reddish brown apically; flagellum brown or blackish brown ventrally; tegula yellowish brown translucent; tibial spur yellow; metasomal terga narrowly yellowish brown translucent apically. Wings transparent, veins and stigma brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: pronotum moderately densely tomentose dorsally and around lobe; hind trochanter, femur, and tibia mixed with plumose hairs, forming scopa. Disc of T 1 without distinct short hairs on medial area. STRUCTURE AND SCULPTURE HEAD. Slightly longer than wide or nearly as long as wide; HW: HL = 1: 1.03. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.85: 0.76. IOD: OOD: OCD = 1: 0.95: 0.69. IAD: AOD = 1: 1.86. Ocellocular area with moderately dense PP, IS smooth (IS = 0.5 – 3 d). Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area slightly convex, weakly shiny, with sparse PP, IS weakly tessellate (IS = 1 – 4 d). CPL: CAL = 1: 0.87. Clypeus nearly flat, with sparse PP over entire surface, IS very weakly tessellate on upper half or ⅓ and smooth on lower half or ⅔ (IS = 1 – 5 d). EW: GW = 1: 0.86. Genal area to postgena with distinct straight ridges. Malar space linear. Occiput not carinate. Hypostomal carinae nearly parallel. Mandible bidentate. Labrum (Fig. 5 D): basal area approximately 1.9 × as wide as long; distal process approximately 0.6 × as long as basal area, tongue-like, and without lateral projection; distal keel rounded, pointed apically. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 1.72; flagellum nearly flattened ventrally. THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum (Fig. 5 E) with moderately dense PP over entire surface; IS weakly tessellate over entire surface (particularly very weak on posterior area) (IS = 0.5 – 3 d); parapsidal line a narrow groove. Mesoscutellum with 2 – 4 PP on submedian area and denser PP on marginal area; IS nearly smooth on submedian area and very weakly tessellate on marginal area (IS = 2 – 5 d on submedian area, = 0.5 – 2 d on marginal area). Metanotum weakly rugulose. Mesepisternum weakly shiny, with dense shallow PP on upper area and reticulate PP on lower area; IS nearly smooth on upper area (IS = 0.5 – 1 d on upper area). SCL: MNL: MPL = 1: 0.62: 0.66. Propodeum: metapostnotum (Fig. 5 F) gently inclined, with irregular sinuate ridges on anterior half in holotype and two paratypes (remaining five paratypes with short longitudinal ridges), with weak tessellation on posterior half, and nearly smooth among ridges; junction between metapostnotum and posterior surface not carinate, with weak tessellation; lateral surface weakly rugulose; posterior surface with lateral carina on lower half, without oblique carina. Coxae usual shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur with slender 2 – 4 teeth as in Fig. 20 B (n = 7). Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 without distinct PP on medial area, and with very weak lineolation interrupted on medial area (Fig. 15 B). Disc of T 2 nearly smooth on anterior to medial area in holotype and two paratypes, and with weak lineolation on posterior area (anterior and posterior area with weak lineolation in four paratypes). Discs of T 3 – T 4 with weak lineolation over entire surface. Male MEASUREMENTS (n = 1, unit mm). BL = 4.23, WL = 3.92, HL = 1.56, HW = 1.51, IOD = 0.29, OOD = 0.29, OCD = 0.16, UOD = 0.98, MOD = 1.04, LOD = 0.84, IAD = 0.20, AOD = 0.24, CAL = 0.31, CPL = 0.33, EL = 1.07, EW = 0.40, GW = 0.44, SPL = 0.44, F 1 L = 0.11, F 2 L = 0.18, F 3 L = 0.16, F 2 W = 0.13, MsW = 1.55, SCL = 0.36, MNL = 0.22, MPL = 0.27, MtW = 1.35. COLORATION. Body black except for the following parts: mandible yellowish brown except for apically reddish brown; labrum dark yellow; pronotal lobe yellowish brown; tegula yellowish brown translucent; legs brown, without distinct yellow marks; tibial spur yellow; metasomal terga broadly yellowish brown translucent apically. Wings transparent, veins and stigma pale brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: lower paraocular area and pronotal dorsum to lobe sparsely tomentose. Disc of T 1 with sparse hairs only on marginal area. Disc of T 2 – T 4 with sparse short hairs over entire surface. T 2 – T 3 with thin apical fimbriae, less distinct than in the female. STRUCTURE AND SCULPTURE HEAD. Nearly as long as wide; HW: HL = 1: 1.03. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.94: 0.81. IOD: OOD: OCD = 1: 1: 0.54. IAD: AOD = 1: 1.22. Ocellocular area with moderately dense PP, IS smooth (IS = 1 – 4 d). Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area slightly convex, weakly shiny, with moderately dense PP, IS weakly tessellate (IS = 1 – 3 d). CPL: CAL = 1: 0.93. Clypeus nearly flat, with sparse shallow PP over entire sutface; IS smooth (IS = 1 – 6 d). EW: GW = 1: 1.11. Genal area on lower margin and postgena with straight ridges. Malar space linear. Hypostomal carinae nearly parallel. Mandible edentate. Labrum with basal elevation, but not examined in detail. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 0.75; flagellum nearly flattened ventrally. THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum with moderately dense PP over entire surface; IS weakly tessellate on anterior margin, nearly smooth on rest parts (IS = 1.5 – 3 d); parapsidal line a narrow groove. Mesoscutellum with sparse PP over entire surface; IS smooth (IS = 2.5 – 6 d). Metanotum weakly rugulose. Mesepisternum with moderately dense PP over entire surface; IS smooth (IS = 1 – 3 d). SCL: MNL: MPL = 1: 0.63: 0.75. Propodeum: metapostnotum weakly shiny and gently inclined, with short straight ridges occupying anterior ⅔; junction between metapostnotum and posterior surface not carinate, nearly smooth; lateral surface weakly reticulate; posterior surface nearly smooth, with lateral carina on lower ⅓, and without oblique carina. Coxae usual shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur serrate. Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 nearly smooth. Disc of T 2 – T 3 with sparse fine PP; T 2 weakly lineolate on apical margin; T 3 weakly lioneolate on apical half. Disc of T 4 weakly lineolate over entire surface. S 7 with moderately long, apically rounded median process. GENITALIA. Gonobase flat at bottom; gonocoxite smooth; ventral retrorse lobe tongue-like, moderately long but not reaching gonobase, with sparse short hairs ventrally.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB42FFE4DCAF4991FAABCCFB.taxon	distribution	Distribution Japan (central to southern Ryukyus: Yoron-jima Is., Okinawa-jima Is., Miyako-jima Is., Iriomote-jima Is.).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB42FFE4DCAF4991FAABCCFB.taxon	description	Flight period Female: middle March to late August. Male: July. Flower records Ixeris japonica (Burm. f.) Nakai (Asteraceae).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5EFFE1DCFA4E56FC5DCB50.taxon	description	Figs 6, 15 C, 17 B, 19 A, 20 C	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5EFFE1DCFA4E56FC5DCB50.taxon	diagnosis	Diagnosis Females are separated from the other members of the sexstrigatus group occurring in Japan by a combination of the following character states: IS of mesoscutum nearly smooth on posterior area; metasoma entirely black; metasomal terga with white fimbriae on lateral-apical margin; and disc of T 1 with distinct sparse fine PP (Fig. 15 C) and without lineolation (Murao 2017 a).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5EFFE1DCFA4E56FC5DCB50.taxon	materials_examined	Material examined Holotype CHINA • ♀; Tsingtou, Kiautshou; Jun. – Jul. 1903; S. Glaue leg.; ZMHB. Other material JAPAN – Hokkaido • 1 ♀; Ashoro-cho, Ashoro; 43 ° 20 ′ 0 ″ N, 143 ° 40 ′ 0 ″ E; 2 Jul. 2013; O. Tadauchi leg.; ELKU • 1 ♀; Asahikawa, Asahiyama; 24 Sep. 1970; MNHAH • 2 ♀♀; Ebetsubuto; 8 – 9 Jun. 1974; M. Ishikawa leg.; MNHAH • 3 ♀♀; Asahikawa, Inosawa; 27 Jun. 1969; MNHAH • 10 ♀♀; Kiritapp; 1972; MNHAH • 1 ♀; Moiwa; 3 Jun. 1972; Kawano leg.; MNHAH • 6 ♀♀; Kushiro, Tenneru n.; 1968; E. Ohtsuka leg.; MNHAH • 5 ♀♀; Tobetsu; 22 May – 9 Jul. 1974; M. Ishikawa leg.; MNHAH • 6 ♀♀; Lake Shikotsu (Iburi), Morappu; 11 – 13 Aug. 1953; Y. Hirashima leg.; ELKU • 2 ♀♀; Mombetsu-gun, Engaru; 11 Aug. 1955; K. Morimoto leg.; ELKU. – Honshu • 2 ♀♀; Aomori Pref., Mt Iwaki; 23 Jun. 1981; M. Yamada leg.; MNHAH • 1 ♀; Iwate Pref., Morioka, Kuriyagawa; 16 May 1964; Y. Maeta leg.; ELKU • 1 ♀; Yamagata Pref., Murayama, Tochiuda; 26 May 1975; O. Tadauchi leg.; ELKU • 1 ♀; Yamaguchi Pref., Hagi, Sengokudai; 23 May 1960; Y. Hirashima leg.; ELKU. – Izu Islands • 28 ♀♀; Hachijo Is., Okago-Sokoto; 5 Jun. 1964; Y. Hirashima and M. Shiga leg.; ELKU • 3 ♀♀; Hachijo Is., Mitsune-Kantoyama; 30 May 1964; Y. Hirashima and M. Shiga leg.; ELKU • 2 ♀♀; Okago-Fuji; 26 May 1964; Y. Hirashima and M. Shiga leg.; ELKU • 5 ♀♀; Hachijo Is., Sokoto; 4 Jun. 1964; Y. Hirashima and M. Shiga leg.; ELKU • 2 ♀♀; Hachijo Is., Nakanogo-Daigo yama-Mitsune; 1 Jun. 1964; Y. Hirashima and M. Shiga leg.; ELKU. – Kyushu • 1 ♀; Hiraodai (Buzen); 6 Jul. 1952; K. Yasumatsu leg.; ELKU • 2 ♀♀; Mt Oita Pref., Kokonoe-machi, Sensui-san; 23 May 2005; K. Mitai leg.; cMur • 1 ♀; Oita Pref., Kusu-gun, Kokonoe-machi, Chojyabaru; 33 ° 7 ′ 6.773 ″ N, 131 ° 13 ′ 49.331 ″ E; 1050 m a. s. l.; 14 Aug. 2010; R. Murao leg.; cMur • 1 ♀; same location as for preceding; 5 Sep. 2010; R. Murao leg.; cMur • 1 ♀; Kumamoto Pref., Aso-shi; 33 ° 0 ′ 9.146 ″ N, 131 ° 8 ′ 11.141 ″ E; 21 Jul. 2013; R. Murao leg.; ELKU.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5EFFE1DCFA4E56FC5DCB50.taxon	description	Redescription MEASUREMENTS (n = 5, unit mm). BL = 4.50 – 4.88 (4.68 ± 0.17), WL = 4.00 – 4.63 (4.38 ± 0.27), HL = 1.42 – 1.55 (1.47 ± 0.06), HW = 1.45 – 1.58 (1.51 ± 0.07), IOD = 0.26 – 0.29 (0.27 ± 0.02), OOD = 0.29 – 0.31 (0.29 ± 0.01), OCD = 0.18 – 0.19 (0.18 ± 0.01), UOD = 0.97 – 1.03 (0.99 ± 0.03), MOD = 1.10 – 1.16 (1.12 ± 0.04), LOD = 0.77 – 0.87 (0.82 ± 0.05), IAD = 0.15 – 0.16 (0.15 ± 0.01), AOD = 0.29 – 0.31 (0.30 ± 0.01), CAL = 0.24 – 0.29 (0.27 ± 0.02), CPL = 0.29 – 0.32 (0.31 ± 0.01), EL = 1.60 – 1.75 (1.67 ± 0.07), EW = 0.35 – 0.42 (0.39 ± 0.03), GW = 0.29 – 0.32 (0.30 ± 0.01), SPL = 0.58 – 0.68 (0.62 ± 0.04), F 1 L = 0.08 – 0.10 (0.09 ± 0.01), F 2 L = 0.08 (0.08 ± 0.00), F 3 L = 0.08 (0.08 ± 0.00), F 2 W = 0.11 – 0.15 (0.14 ± 0.01), MsW = 1.60 – 1.80 (1.69 ± 0.10), SCL = 0.33 – 0.40 (0.36 ± 0.03), MNL = 0.20 – 0.23 (0.21 ± 0.01), MPL = 0.23 – 0.25 (0.25 ± 0.01), MtW = 1.60 – 1.90 (1.78 ± 0.13). Female COLORATION. Body black except for the following parts: mandible reddish brown apically; F 4 – F 10 or F 5 – F 10 yellowish brown ventrally; tegula yellowish brown translucent; tibial spur yellow; metasomal terga narrowly yellowish brown translucent apically. Wings transparent, veins and stigma yellowish brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: pronotum moderately densely tomentose on dorsal area and around lobe; hind trochanter, femur, and tibia mixed with plumose hairs, forming scopa. STRUCTURE AND SCULPTURE HEAD. Nearly as long as wide; HW: HL = 1: 0.97. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.88: 0.73. IOD: OOD: OCD = 1: 1.07: 0.67. IAD: AOD = 1: 1.96. Ocellocular area densely puctate, IS smooth (IS = 0.5 – 1.5 d). Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area nearly flat, weakly shiny, with moderately dense PP, IS weakly tessellate (IS = 0.5 – 1 d). CPL: CAL = 1: 0.87. Clypeus nearly flat, with dense PP on upper half and larger shallow PP on lower half, IS nearly smooth (IS = 0.5 d on upper half). EW: GW = 1: 0.77. Genal area with weak straight ridges. Malar space linear. Occiput not carinate. Postgena distinctly tessellate. Hypostomal carinae nearly parallel. Mandible bidentate. Labrum (Fig. 6 C): basal area approximately 2 × as wide as long; distal process approximately 0.7 × as long as basal area, narrow, and without lateral projection; distal keel pointed apically. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 1.68; flagellum nearly flattened ventrally. THOARX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum (Fig. 6 D) with dense PP over entire surface; IS nearly smooth on posterior area, and distinctly tessellate on the rest area (IS = 0.5 – 2 d); parapsidal line a narrow groove. Mesoscutellum with dense PP over entire surface, IS smooth (IS = 0.5 – 2 d). Metanotum weakly rugulose. Mesepisternum weakly shiny, with reticulate PP over entire surface. SCL: MNL: MPL = 1: 0.57: 0.68. Propodeum: metapostnotum (Fig. 6 E) gently inclined, with straight ridges nearly attaining to posterior margin, and nearly smooth among ridges; the junction between metapostnotum and posterior surface not carinate; lateral surface weakly rugulose; posterior surface with lateral carina on lower half, without oblique carina. Coxae normal shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur with slender 2 – 4 teeth as in Fig. 20 C (n = 17). Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 with sparse distinct fine PP on medial area and without lineolation over entire surface (Fig. 15 C). Discs of T 2 – T 4 without lineolation over entire surface (sometimes T 4 with very weak lineolation). Male Not examined in the present study.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5EFFE1DCFA4E56FC5DCB50.taxon	distribution	Distribution Japan (Hokkaido, Honshu, Kyushu, Izu-shotô Islands), Korean Peninsula, Russian Far East, China.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5EFFE1DCFA4E56FC5DCB50.taxon	description	Flight records Female: May to September. Males have been collected from July to August in Primorsky, Russian Far East (Ebmer 1996, 2006). Flower records The specimens examined in this paper were collected on the flowers of 7 species in 3 families as follows. Asteraceae: Leontodon taraxacoides (Vill.) Mérat; Sonchus brachyotus DC. Brassicaceae: Armoracia rusticana Gaertn., B. Mey. & Scherb.; Barbarea orthoceras Ledeb.; Brassica rapa L. var. oleifera DC.; Rorippa sp. Fabaceae: Trifolium repens L. Habitat This species has been collected from semi-natural grassland in western Japan. One of the collecting sites is shown in Fig. 19 A.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5EFFE1DCFA4E56FC5DCB50.taxon	discussion	Remarks According to Cockerell (1925), the syntypes of Halictus perplexans are preserved in USNM. During my visit to ZMHB in 2012, I found and examined a syntype of H. perplexans.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5BFFE2DCCC48F8FC79CBBC.taxon	description	Figs 7, 15 D, 17 C, 19 A, 20 D	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5BFFE2DCCC48F8FC79CBBC.taxon	diagnosis	Diagnosis Females are similar to L. (H.) simplicior but separated from them by the head slightly longer than wide or nearly as long as wide (HL / HW ratio 1.01 ± 0.02), IS of mesoscutum nearly smooth on posterior margin, and metasomal terga with silky dull luster. In contrast, in L. (H.) simplicior, the head wider than long (HL / HW ratio 0.97 ± 0.03), IS of mesoscutum with distinct tessellation over entire surface, and metasomal terga with enamel-like luster as in most species of Lasioglossum.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5BFFE2DCCC48F8FC79CBBC.taxon	materials_examined	Material examined Paratypes JAPAN – Hokkaido • 1 ♀; Kitami; 18 Jul. 1965; S. F. Sakagami leg.; MNHAH • 16 ♀♀, 7 ♂♂; same location as for preceding; 22 Jul. – 14 Aug. 1964; S. F. Sakagami leg.; MNHAH • 3 ♀♀; same location as for preceding; 14 Aug. 1964; S. F. Sakagami leg.; MNNAH • 6 ♀♀, 2 ♂♂; same location as for preceding; 23 Aug. 1959; S. F. Sakagami leg.; MNHAH • 1 ♂; Kitamoshiri, Hokkaido Uryu Experimental Forest; 12 Sep. 1969; S. F. Sakagami and H. Fukuda leg.; MNHAH • 1 ♀, 4 ♂♂; same location as for preceding; 14 Sep. 1969; S. F. Sakagami and H. Fukuda leg.; MNHAH. Other material JAPAN – Hokkaido • 1 ♀; Mt Daisetsu, Aizankei; 30 Jul. – 3 Aug. 1955; Y. Hirashima leg.; ELKU • 1 ♀; Asahikawa, Asahiyama; 18 Jun. 1985; T. Inaoka leg.; MNHAH • 1 ♀; Sapporo, Barato; 3 Jun. 1973; M. Matsumoto leg.; MNHAH • 1 ♀; same location as for preceding; 7 Jun. 1973; M. Matsumoto leg.; MNHAH • 1 ♀; same location as for preceding; 14 Jun. 1973; M. Matsumoto leg.; MNHAH • 7 ♀♀; same location as for preceding; 21 Jun. 1973; M. Matsumoto leg.; MNHAH • 12 ♀♀; same location as for preceding; 28 Jun. 1973; M. Matsumoto leg.; MNHAH • 1 ♀; same location as for preceding; 27 Jul. 1973; M. Mastumoto leg.; MNHAH • 2 ♀♀; same location as for preceding; 3 Aug. 1973; M. Matsumoto leg.; MNHAH • 1 ♀; same location as for preceding; 8 Aug. 1973; M. Matsumoto leg.; MNHAH • 1 ♀; Fukushima; 27 Jul. 1965; M. Munakata leg.; MNHAH • 1 ♀; Asahikawa, Inosawa; 30 May 1969; MNHAH • 4 ♀♀; same location as for preceding; 25 Jun. 1969; MNHAH • 6 ♀♀; same location as for preceding; 27 Jun. 1969; MNHAH • 14 ♀♀; same location as for preceding; 13 Jul. 1969; MNHAH • 1 ♀; same location as for preceding; 15 Jul. 1969; MNHAH • 1 ♀; same location as for preceding; 15 Aug. 1969; MNHAH • 2 ♀♀; same location as for preceding; 29 May 1970; MNHAH • 14 ♀♀; same location as for preceding; 10 Jun. 1970; MNHAH • 7 ♀♀; Nokanan; 8 Jun. 1967; MNHAH • 6 ♀♀; same location as for preceding; 22 Jun. 1967; MNHAH • 1 ♀; same location as for preceding; 27 Jun. 1967; MNHAH • 1 ♀; same location as for preceding; 6 Jul. 1967; MNHAH • 17 ♀♀; same location as for preceding; 21 Jul. 1967; MNHAH • 3 ♀♀; Sapporo, Hokkaido University Campus; 6 Jun. 1959; S. F. Sakagami leg.; MNHAH • 1 ♀; same location as for preceding; 11 Jun. 1959; S. F. Sakagami leg.; MNHAH • 1 ♀; same location as for preceding; 14 Jun. 1959; S. F. Sakagami leg.; MNHAH • 2 ♀♀; same location as for preceding; 18 Jun. 1959; S. F. Sakagami leg.; MNHAH • 4 ♀♀; same location as for preceding; 30 Jun. 1959; S. F. Sakagami leg.; MNHAH • 1 ♀; Yukomanbetsu; 22 Jul. 1967; MNHAH • 1 ♀; same location as for preceding; 4 Jul. 1968; MNHAH • 1 ♂; Ebetsubuto; 18 Jul. 1974; M. Ishikawa leg.; MNHAH. – Honshu • 1 ♀; Aomori Pref., Mt Iwaki; 5 Oct. 1980; M. Yamada leg.; MNHAN • 1 ♀; same location as for preceding; 14 Jul. 1981; M. Yamada leg.; MNHAH • 1 ♀; Miyagi Pref., Shiogamashi, Hojima; 19 May 1995; K. Gôukon leg.; cGou • 1 ♀; same location as for preceding; 25 May 1996; K. Gôukon leg.; cGou • 1 ♀; Niigata Pref., Sado Is., Dondenyama; 9 Jul. 1999; K. Gôukon leg.; cGou • 1 ♀; same location as for preceding; 10 Jul. 1999; K. Gôukon leg.; cGou • 1 ♀; Saitama Pref., Kodama; 6 Jun. 1968; T. Nambu leg.; ELKU • 4 ♀♀; same location as for preceding; 3 Jul. 1968; T. Nambu leg.; ELKU • 1 ♀; Nagano Pref., Yamaguchi-mura, Magome; 15 May 1975; O. Tadauchi leg.; ELKU • 5 ♀♀; Gifu Pref., Hikie; 5 Jun. 1978; K. Yamauchi leg.; MNHAH • 3 ♀; same location as for preceding; 28 Jun. 1978; K. Yamauchi leg.; MNHAH • 1 ♀; Wakayama Pref., Kibi; 2 Apr. 1969; M. Matsuura leg.; MNHAH • 1 ♀; same location as for preceding; 26 May 1969; M. Matsuura leg.; MNHAH • 1 ♀; Yamaguchi Pref., Toyoda-machi, Houra; 12 May 2004; T. Sugimoto leg.; cMur. – Kyushu • 5 ♀♀; Fukuoka Pref., Mt Wakasugi-yama; 22 Apr. 1973; O. Tadauchi leg.; ELKU • 1 ♀; Oita Pref., Kokonoemachi, Jizoubaru; 1 Nov. 1970; K. Kanmiya leg.; ELKU • 2 ♀♀; Oita Pref., Kusu-gun, Kokonoemachi, Handakougen; 5 Jun. 2004; T. Sugimoto leg.; cMur • 1 ♀; Oita Pref., Kusu-gun, Kokonoe-machi, Chojyabaru; 33 ° 7 ′ 6.773 ″ N, 131 ° 13 ′ 49.331 ″ E; 1050 m a. s. l.; 13 Aug. 2010; R. Murao leg.; cMur • 3 ♀♀; same location as for preceding; 14 Aug. 2010; R. and Y. Murao leg.; cMur • 1 ♀; same location as for preceding; 5 Sep. 2010; Y. Murao leg.; cMur • 8 ♀♀; same location as for preceding; 15 May 2011; R. and Y. Murao leg.; cMur • 3 ♀♀; same location as for preceding; 12 Aug. 2011; R. Murao leg.; cMur • 1 ♀; same location as for preceding; 28 Aug. 2011; R. Murao leg.; cMur • 1 ♀; same location as for preceding; 5 Aug. 2013; R. Murao leg.; ELKU • 2 ♀♀; Kumamoto Pref., Aso-gun, Aso-machi, Matoishi-Kario; 28 Sep. 2007; R. Murao and Y. Nishimura leg.; cMur • 2 ♀♀, 3 ♂♂; Kumamoto Pref., Aso-gun, Aso-machi, near Mt Komezuka; 23 Jul. 2004; R. Murao and T. Sugimoto leg.; cMur • 1 ♀; Kumamoto Pref., Aso-gun, Choyou-son, Kawayou; 26 May 2004; T. Sugimoto leg.; cMur.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5BFFE2DCCC48F8FC79CBBC.taxon	distribution	Distribution Japan (Hokkaido, Honshu, Kyushu, northern Ryukyus).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB5BFFE2DCCC48F8FC79CBBC.taxon	description	Flight period Female: April to November. Male: July to September. The flight records of males are based on the paratypes collected or reared from the nest (Sakagami et al. 1966). Flower records The specimens examined in this paper were collected on the flowers of 50 species in 19 families as follows. Amaryllidaceae: Allium fistulosum L. Apiaceae: Sanicula chinensis Bunge. Asteraceae: Achillea alpina L. var. longiligulata H. Hara; Aster microcephalus (Miq.) Franch. & Sav. var. ovatus (Franch. & Sav.) Soejima & Mot. Ito; Erigeron annuus (L.) Pers.; Eupatorium glehnii F. Schmidt ex Trautv.; Ixeridium dentatum (Thunb.) Tzvelev subsp. dentatum; Leontodon taraxacoides (Vill.) Mérat; Picris hieracioides L. subsp. japonica (Thunb.) Krylov; Pterocypsela elata (Hemsl.) C. Shih; Sonchus sp.; Taraxacxum sp. Brassicaceae: Brassica rapa L. var. glabra Regel ‘ Pe-tsai’; Brassica rapa L. var. oleifera DC.; Brassica rapa L. var. rapa; Capsella bursa-pastoris (L.) Medik.; Raphanus sativus L. var. hortensis Backer; Thlaspi arvense L. Campanulaceae: Lobelia sessilifolia Lamb. Commelinaceae: Commelina communis L. Convolvulaceae: Calystegia pubescens Lindl. Fabaceae: Trifolium pratense L.; Trifolium repens L. Gentianaceae: Gentiana zollingeri Fawc. Hydrangeaceae: Deutzia scabra Thunb.; Hydrangea macrophylla (Thunb.) Ser. f. macrophylla; Hydrangea serrata (Thunb.) Ser. var. serrata. Hypericaceae: Hypericum patulum Thunb. Iridaceae: Iris sanguinea Hornem. Lamiaceae: Prunella vulgaris L. subsp. asiatica (Nakai) H. Hara. Paeoniaceae: Paeonia suffruticosa Andrews. Papaveraceae: Chelidonium majus L. subsp. asiaticum H. Hara; Hylomecon japonica (Thunb.) Prantl & Kündig. Polygonaceae: Persicaria filiformis (Thunb.) Nakai ex W. T. Lee; Persicaria longiseta (Bruijn) Kitag. Ranunculaceae: Ranunculus cantoniensis DC.; Ranunculus chinensis Bunge; Ranunculus japonicus Thunb.; Ranunculus repens L. Rosaceae: Filipendula multijuga Maxim.; Geum japonicum Thunb.; Malus pumila Mill.; Potentilla fragarioides L. var. major Maxim.; Potentilla freyniana Bornm.; Rosa multiflora Thunb.; Rosa rugosa Thunb.; Rosa sp.; Rubus parvifolius L. Saururaceae: Houttuynia cordata Thunb. Habitat This species has been collected mainly from the mountain of western Japan. One of the collecting sites is shown in Fig. 19 A. Biological reference Sakagami et al. (1966) and Sakagami (1992) reported on the biology of this species as univoltine and communal, with nest structure type Ia of Sakagami & Michener (1962).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB58FFEEDCE9489EFD66CAFC.taxon	description	Figs 2 D, 8, 15 E, 17 D	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB58FFEEDCE9489EFD66CAFC.taxon	diagnosis	Diagnosis Females are similar to L. (H.) ohei, but separated from them by the head wider than long (HL / HW ratio 0.97 ± 0.03), IS of mesoscutum with distinct tessellation over entire surface, and metasomal terga with enamel-like luster. In contrast, in L. (H.) ohei, the head is slightly longer than wide or nearly as long as wide (HL / HW ratio 1.01 ± 0.02), IS of mesoscutum nearly smooth on posterior margin, and metasomal terga with silky dull luster.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB58FFEEDCE9489EFD66CAFC.taxon	materials_examined	Material examined Holotype CHINA • ♀; Prov. Kiangsu, Shanghai, Zô-Sè; AMNH. Other material JAPAN – Izu Islands • 44 ♀♀; Hachijo Is., Okago-Fuji; 26 May 1964; Y. Hirashima and M. Shiga leg.; ELKU • 4 ♂♂; same collection data as for preceding; ELKU • 3 ♀♀; Hachijo Is., Okago-Sokoto; 5 Jun. 1964; Y. Hirashima and M. Shiga leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 2 ♀♀; Mt Kanto-yama, Hachijo Is.; 2 Jun. 1964; Y. Hirashima and M. Shiga leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♀; Hachijo Is., Kamogawa; 27 May 1964; Y. Hirashima and M. Shiga leg.; ELKU • 2 ♂♂; same collection data as for preceding; ELKU • 15 ♀♀; Hachijo Is., Mitsune-Kantoyama; 30 May 1964; Y. Hirashima and M. Shiga leg.; ELKU • 1 ♀; Hachijo Is., Hachijo Fuji; 31 May 1964; Y. Hirashima and M. Shiga leg.; ELKU • 1 ♀; Hachijo Is., Eigo; 2 Jun. 1964; Y. Hirashima and M. Shiga leg.; ELKU • 1 ♂; same collection data as for preceding; ELKU • 1 ♂; same location as for preceding; 15 Aug. 1987; H. Takahashi leg.; ELKU • 1 ♀; same location as for preceding; 26 Sep. 1987; H. Takahashi leg.; MNHAH • 1 ♀; same location as for preceding; 4 Oct. 1987; H. Takahashi leg.; MNHAH • 1 ♂; Hachijo Is., Mt Mitsune-yama, Nakanogo-Daigo; 1 Jun. 1964; Y. Hirashima and M. Shiga leg.; ELKU • 1 ♀; Hachijo Is., Bouei Road; 27 Sep. 1987; H. Takahashi leg.; MNHAH • 2 ♂♂; same collection data as for preceding; MNHAH • 3 ♂♂; same location as for preceding; 3 Oct. 1987; H. Takahashi leg.; ELKU • 1 ♀; Hachijo Is., Okago; 10 Jul. 1987; H. Takahashi leg.; MNHAH • 1 ♂; Hachijo Is., Sokoto; 4 Jun. 1964; Y. Hirashima and M. Shiga leg.; ELKU • 1 ♀; Tokyo, Aoga Is., Yasundogou; 10 Aug. 1987; H. Takahashi leg.; MNHAH.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB58FFEEDCE9489EFD66CAFC.taxon	description	Redescription Female MEASUREMENTS (n = 6, unit mm). BL = 5.25 – 5.75 (5.41 ± 0.24), WL = 3.85 – 5.25 (4.81 ± 0.52), HL = 1.48 – 1.58 (1.54 ± 0.05), HW = 1.52 – 1.68 (1.59 ± 0.07), IOD = 0.22 – 0.31 (0.27 ± 0.03), OOD = 0.26 – 0.33 (0.28 ± 0.03), OCD = 0.13 – 0.21 (0.18 ± 0.03), UOD = 0.97 – 1.03 (1.01 ± 0.02), MOD = 1.09 – 1.23 (1.16 ± 0.06), LOD = 0.82 – 0.94 (0.88 ± 0.05), IAD = 0.16 (0.16 ± 0.00), AOD = 0.27 – 0.32 (0.29 ± 0.02), CAL = 0.22 – 0.31 (0.28 ± 0.03), CPL = 0.32 – 0.35 (0.34 ± 0.01), EL = 1.09 – 1.85 (1.66 ± 0.29), EW = 0.39 – 0.45 (0.42 ± 0.02), GW = 0.29 – 0.35 (0.33 ± 0.02), SPL = 0.60 – 0.66 (0.64 ± 0.02), F 1 L = 0.07 – 0.10 (0.09 ± 0.01), F 2 L = 0.07 – 0.08 (0.08 ± 0.01), F 3 L = 0.08 – 0.10 (0.09 ± 0.01), F 2 W = 0.11 – 0.15 (0.13 ± 0.01), MsW = 1.71 – 2.00 (1.88 ± 0.12), SCL = 0.31 – 0.43 (0.39 ± 0.05), MNL = 0.22 – 0.28 (0.25 ± 0.02), MPL = 0.24 – 0.28 (0.26 ± 0.01), MtW = 1.75 – 2.05 (1.90 ± 0.11). COLORATION. Body black except for the following parts: mandible reddish brown apically; flagellum blackish brown ventrally; tegula yellowish brown translucent; tibial spur yellow; metasomal terga broadly yellowish brown translucent apically. Wings transparent, veins and stigma yellowish brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: pronotum moderately densely tomentose on dorsal area and around lobe; hind trochanter, femur, and tibia mixed with plumose hairs, forming scopa. STRUCTURE AND SCULPTURE HEAD. Wider than long or nearly as long as wide; HW: HL = 1: 0.97. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.87: 0.76. IOD: OOD: OCD = 1: 1.05: 0.68. IAD: AOD = 1: 1.84. Ocellocular and paraocular areas, frons weakly shiny, with shallow reticulate PP. Supraclypeal area slightly convex, dull, with dense PP, IS distinctly tessellate (IS = 0.5 – 2 d). CPL: CAL = 1: 0.82. Clypeus nearly flat, with dense PP on upper half and larger shallow PP on lower half, IS nearly smooth (IS = 0.5 – 1 d on upper half). EW: GW = 1: 0.78. Genal area with weak straight ridges. Malar space linear. Occiput not carinate. Postgena distinctly tessellate. Hypostomal carinae nearly parallel. Mandible bidentate. Labrum (Fig. 8 D): basal area approximately 2.2 × as wide as long; distal process approximately 0.7 × as long as basal area, narrow, and without lateral projection; distal keel pointed apically. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 1.71; flagellum nearly flattened ventrally. THOARX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum (Fig. 8 E) with dense PP over entire surface; IS distinctly tessellate over entire surface (IS = 0.5 – 2 d); parapsidal line a narrow groove. Mesoscutellum with dense PP over entire surface, IS with weak tessellation (IS = 0.5 – 2 d). Metanotum weakly rugulose. Mesepisternum weakly shiny, with reticulate PP over entire surface. SCL: MNL: MPL = 1: 0.63: 0.65. Propodeum: metapostnotum (Fig. 8 F) gently inclined, with irregular sinuate ridges nearly attaining to posterior margin; junction between metapostnotum and posterior surface not carinate; lateral surface weakly rugulose; posterior surface with lateral carina on lower ⅔, without oblique carina. Coxae usual shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur with slender 2 – 5 teeth (n = 50). Fore wing with three submarginal cells. ABDOMEN. DISC OF T 1 WITH SPARSE FINE PP ON MEDIAL AREA AND LINEOLATION OVER ENTIRE SURFACE (FIG. 15 E). Lineolation on T 2 – T 5 nearly over entire surface. First description of male MEASUREMENTS (n = 5, unit mm). BL = 4.38 – 5.62 (4.94 ± 0.41), WL = 3.92 – 5.15 (4.37 ± 0.43), HL = 1.44 – 1.49 (1.45 ± 0.02), HW = 1.51 – 1.62 (1.56 ± 0.04), IOD = 0.27 – 0.29 (0.28 ± 0.02), OOD = 0.29 – 0.31 (0.30 ± 0.01), OCD = 0.20 – 0.22 (0.21 ± 0.01), UOD = 0.98 – 1.04 (1.02 ± 0.03), MOD = 1.04 – 1.11 (1.08 ± 0.03), LOD = 0.80 – 0.91 (0.85 ± 0.05), IAD = 0.20 – 0.22 (0.20 ± 0.01), AOD = 0.22 – 0.24 (0.24 ± 0.01), CAL = 0.22 – 0.24 (0.24 ± 0.01), CPL = 0.31 – 0.38 (0.34 ± 0.02), EL = 1.07 – 1.11 (1.08 ± 0.02), EW = 0.44 – 0.49 (0.46 ± 0.02), GW = 0.36 – 0.44 (0.40 ± 0.03), SPL = 0.42 – 0.44 (0.44 ± 0.01), F 1 L = 0.11 (0.11 ± 0.00), F 2 L = 0.16 – 0.18 (0.17 ± 0.01), F 3 L = 0.16 – 0.18 (0.17 ± 0.01), F 2 W = 0.11 – 0.13 (0.13 ± 0.01), MsW = 1.39 – 1.55 (1.47 ± 0.05), SCL = 0.36 – 0.38 (0.36 ± 0.01), MNL = 0.18 – 0.20 (0.18 ± 0.01), MPL = 0.22 (0.22 ± 0.00), MtW = 1.19 – 1.32 (1.24 ± 0.05). COLORATION. Body black except for the following parts: mandible yellow except for apically reddish; labrum and lower half of clypeus yellow; flagellum yellowish brown ventrally; tegula yellowish brown translucent; tibiae basally and apically yellow; tibial spur yellow; tarsi yellow; metasomal terga broadly yellowish brown translucent apically. Wings transparent, veins and stigma pale yellowish brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: lower paraocular area sparsely tomentose. STRUCTURE AND SCULPTURE HEAD. Wider than long; HW: HL = 1: 0.93. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.94: 0.78. IOD: OOD: OCD = 1: 1.06: 0.73. IAD: AOD = 1: 1.11. Ocellocular and paraocular areas, frons weakly shiny, with shallow reticulate PP. Supraclypeal area nearly flat, dull, with reticulate PP, IS distinctly tessellate. CPL: CAL = 1: 0.71. Clypeus nearly flat, with dense PP over entire surface, IS smooth (IS = 0.5 – 1 d). EW: GW = 1: 0.88. Genal area with weak straight ridges. Malar space linear. Occiput not carinate. Postgena distinctly lineolate. Hypostomal carinae nearly parallel. Mandible edentate. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 0.74; flagellum nearly flattened ventrally. THOARX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum with dense PP over entire surface; IS weakly tessellate on anterior margin, otherwise smooth (IS = 0.5 – 2 d); parapsidal line a narrow groove. Mesoscutellum with moderately dense over entire surface, IS smooth (IS = 0.5 – 3 d). Metanotum weakly rugulose. Mesepisternum weakly shiny, with reticulate PP over entire surface. SCL: MNL: MPL = 1: 0.50: 0.61. Propodeum: metapostnotum gently inclined, with longitudinal ridges on anterior ⅔, not reaching posterior margin; junction between metapostnotum and posterior surface not carinate and nearly smooth; lateral surface weakly rugulose; posterior surface with lateral carina on lower half, without oblique carina. Coxae usual shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur serrate. Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 with sparse fine PP and without lineolation. Disc of T 2 – T 3 with denser PP than T 1; T 2 without lineolation, and T 3 posteriorly with weak lineolation. T 4 with weak lineolation over entire surface. S 7 with moderately long, apically rounded median process. GENITALIA. Gonobase flat at bottom; gonocoxite smooth; ventral retrorse lobe tongue-like, moderately long reaching gonobasal ventral arm, with sparse short hairs ventrally.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB58FFEEDCE9489EFD66CAFC.taxon	distribution	Distribution Japan (Izu-shotô Islands: Hachijo-jima Is., Aoga-shima Is.), Korean Peninsula, Russian Far East, China.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB58FFEEDCE9489EFD66CAFC.taxon	description	Flight period Female: late May to early October. Male: late May to middle October. Flower record Hydrangea macrophylla (Thunb.) Ser. (Hydrangeaceae). Comments The type locality of this species is Shanghai in China, so it is not surprising that L. simplicior is also distributed on the Japanese mainland. Interestingly, Japanese specimens matching the holotype were found only on the Izu Islands and not on the Japanese mainland. In the future, it may be worth while to verify whether the population of the Izu Islands indeed represents L. simplicior, after comparison of the genes of both the continental and Izu Islands populations. This species has been recorded from Japan (Takahashi & Sakagami 1993; Goubara et al. 2004; Fukasawa & Miyano 2010). However, these records were excluded from the Japanese bee fauna because of the need to re-examine them (Tadauchi & Murao 2014; Murao 2020). In the present study, the distribution of this species in Japan was reconfirmed by comparing with the type specimen.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB54FFEADCC5485CFBF0CAA9.taxon	description	Figs 9, 15 F, 18 D, 20 E	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB54FFEADCC5485CFBF0CAA9.taxon	diagnosis	Diagnosis Females are similar to L. (H.) ikudomei sp. nov. but are separated from them by the supraclypeal area dimly shiny (IS distinctly tessellate), the PP on the mesoscutum denser (IS = 2 d in maximum) (Fig. 9 E), and the lineolation of T 1 more clear. In contrast, in L. (H.) ikudomei sp. nov., the supraclypeal area is more shiny (IS weakly tessellate), the PP on the mesoscutum sparser (IS = 3 d in maximum) (Fig. 5 E), and T 1 with very weak lineolation.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB54FFEADCC5485CFBF0CAA9.taxon	materials_examined	Material examined Holotype JAPAN – Ryukyus • ♀; Kagoshima Pref., Suwanose-jima; 2 Aug. 1985; S. Ikudome leg.; ELKU. Paratype JAPAN – Ryukyus • 1 ♂; Kagoshima Pref., Akuseki-jima; 150 – 230 m a. s. l.; 2 Aug. 1985; S. Ikudome leg.; KWC. Other material JAPAN – Ryukyus • 1 ♀; Kagoshima Pref., Iwo-jima; 1 May 2011; T. Kawano leg.; cMur • 1 ♀; Kagoshima Pref., Ôsumi Is., Kuchinoerabu-jima; 21 Jul. 1989; H. Watanabe leg.; KWC • 1 ♀; Kagoshima Pref., Kuroshima Is., Osato; 4 Sep. 1981; Sk. Yamane leg.; KWC • 1 ♂; Kagoshima Pref., Osumi-shotô, Yakushima, Issô; 30 Jul. 1988; Sk. Yamane leg.; KWC • 2 ♀; Kagoshima Pref., Tokara Islands, Takarajima Isl., Oogomori; 31 May – 4 Jun. 2005; T. Mita leg., yellow pan trap; cMur • 1 ♀; Kagoshima Pref., Tokara Islands, Nakano-shima, Mt On-take; 7 Jun. 2005; T. Mita leg.; cMur • 1 ♀; Kagoshima Pref., Tokara, Nakano-shima, Ikenobaru; 220 m a. s. l.; 14 Oct. 1985; S. Ikudome leg.; KWC • 1 ♀; Kagoshima Pref., Tokara Islands, Nakano-shima, Toshima; 21 Jun. 1973; H. Makihara leg.; ELKU • 1 ♂; Kagoshima Pref., Tokara, Suwanose-jima; 50 – 120 m a. s. l.; 31 Jul. 1985; S. Ikudome leg.; KWC.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB54FFEADCC5485CFBF0CAA9.taxon	description	Redescription Female MEASUREMENTS (n = 5, unit mm). BL = 4.88 – 5.75 (5.48 ± 0.35), WL = 4.50 – 5.13 (4.80 ± 0.24), HL = 1.48 – 1.68 (1.59 ± 0.07), HW = 1.45 – 1.61 (1.55 ± 0.06), IOD = 0.26 – 0.29 (0.28 ± 0.01), OOD = 0.24 – 0.26 (0.25 ± 0.01), OCD = 0.19 – 0.24 (0.21 ± 0.02), UOD = 0.87 – 1.00 (0.95 ± 0.05), MOD = 1.03 – 1.18 (1.13 ± 0.06), LOD = 0.77 – 0.90 (0.86 ± 0.05), IAD = 0.13 – 0.16 (0.15 ± 0.01), AOD = 0.26 – 0.31 (0.28 ± 0.02), CAL = 0.27 – 0.29 (0.28 ± 0.01), CPL = 0.32 – 0.35 (0.34 ± 0.01), EL = 1.60 – 1.85 (1.79 ± 0.11), EW = 0.39 – 0.45 (0.41 ± 0.03), GW = 0.29 – 0.35 (0.34 ± 0.03), SPL = 0.63 – 0.66 (0.65 ± 0.01), F 1 L = 0.08 – 0.10 (0.09 ± 0.01), F 2 L = 0.08 – 0.11 (0.09 ± 0.01), F 3 L = 0.08 – 0.10 (0.08 ± 0.01), F 2 W = 0.11 – 0.15 (0.13 ± 0.01), MsW = 1.75 – 2.05 (1.92 ± 0.12), SCL = 0.38 – 0.43 (0.41 ± 0.02), MNL = 0.23 – 0.28 (0.26 ± 0.02), MPL = 0.28 – 0.33 (0.31 ± 0.02), MtW = 1.80 – 2.15 (2.00 ± 0.14). COLORATION. Body black except for the following parts: mandible reddish brown apically; F 4 – F 10 yellowish brown ventrally; tegula yellowish brown translucent; tibial spur yellow; metasomal terga narrowly yellowish brown translucent apically. Wings transparent, veins and stigma blackish brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: pronotal dorsum to lobe and metanotum densely tomentose; hind trochanter, femur, and tibia mixed with plumose hairs, forming scopa. Disc of T 1 without short hairs. Discs of T 2 – T 4 with moderately dense short hairs over entire surface. STRUCTURE AND SCULPTURE HEAD. Nearly as long as wide; HW: HL = 1: 1.02. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.84: 0.76. IOD: OOD: OCD = 1: 0.88: 0.76. IAD: AOD = 1: 1.91. Ocellocular area moderately densely puctate, IS smooth (IS = 1 – 2.5 d). Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area slightly convex, weakly shiny, with dense PP, IS weakly tessellate (IS = 1 – 1.5 d). CPL: CAL = 1: 0.83. Clypeus nearly flat, with dense PP on upper half and larger shallow PP on lower half; IS weakly tessellate on upper half and nearly smooth on lower half (IS = 1 – 2 d on upper half). EW: GW = 1: 0.81. Genal area to postgena with straight ridges. Malar space linear. Occiput not carinate. Hypostomal carinae nearly parallel. Mandible bidentate. Labrum (Fig. 9 D): basal area approximately 1.9 × as wide as long; distal process approximately 0.6 × as long as basal area, narrow, and without lateral projection; distal keel pointed apically. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 1.48; flagellum nearly flattened ventrally. THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum (Fig. 9 E) with dense PP over entire surface; IS distinctly tessellate over entire surface (IS = 0.5 – 2 d); parapsidal line a narrow groove. Mesoscutellum with sparser PP on submedian area and denser PP on marginal area; IS weakly tessellate over entire surface (IS = 1 – 4 d on submedian area, and 0.5 – 2 d on marginal area). Metanotum weakly rugulose. Mesepisternum shallow reticulate-punctate on upper area and weakly rugulae on lower area. SCL: MNL: MPL = 1: 0.63: 0.74. Propodeum: metapostnotum (Fig. 9 F) dimly shiny and gently inclined, with straight ridges occupying anterior half, and distinctly tessellate on posterior half; junction between metapostnotum and posterior surface not carinate, distinctly tessellate; lateral surface distinctly tessellate; posterior surface with lateral carina on lower half, without oblique carina. Coxae usual shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur pectinate, with 3 – 4 teeth as in Fig. 20 E (n = 4). Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 without distinct PP and with weak lineolation over entire surface (Fig. 15 F). Disc of T 2 weakly lineolate on anterior and posterior area, and nearly smooth on medial area. Discs of T 3 – T 4 with weak lineolation over entire surface. Male MEASUREMENTS (n = 3, unit mm). BL = 4.77 – 5.38 (4.90 ± 0.36), WL = 3.77 – 4.46 (4.21 ± 0.31), HL = 1.42 – 1.73 (1.60 ± 0.13), HW = 1.36 – 1.76 (1.56 ± 0.16), IOD = 0.27 – 0.31 (0.30 ± 0.02), OOD = 0.27 – 0.29 (0.27 ± 0.01), OCD = 0.16 – 0.22 (0.19 ± 0.03), UOD = 0.89 – 1.13 (1.00 ± 0.10), MOD = 0.93 – 1.24 (1.08 ± 0.13), LOD = 0.69 – 1.02 (0.86 ± 0.14), IAD = 0.16 – 0.24 (0.20 ± 0.04), AOD = 0.22 – 0.31 (0.25 ± 0.04), CAL = 0.27 – 0.31 (0.30 ± 0.02), CPL = 0.29 – 0.38 (0.34 ± 0.04), EL = 1.00 – 1.24 (1.13 ± 0.10), EW = 0.38 – 0.47 (0.42 ± 0.04), GW = 0.36 – 0.51 (0.44 ± 0.06), SPL = 0.36 – 0.42 (0.46 ± 0.04), F 1 L = 0.13 – 0.16 (0.14 ± 0.01), F 2 L = 0.16 – 0.20 (0.18 ± 0.02), F 3 L = 0.16 – 0.18 (0.17 ± 0.01), F 2 W = 0.13 – 0.16 (0.15 ± 0.01), MsW = 1.42 – 1.77 (1.60 ± 0.15), SCL = 0.36 – 0.42 (0.39 ± 0.03), MNL = 0.20 – 0.22 (0.21 ± 0.01), MPL = 0.27 – 0.29 (0.28 ± 0.01), MtW = 1.29 – 1.61 (1.46 ± 0.13). COLORATION. Body black except for the following parts: lower half or margin dark yellow; mandible reddish brown; labrum dark yellow; pedicel and F 1 yellowish brown ventrally; tegula yellowish brown translucent; tibial spur yellow; tarsi yellowish brown or brown; metasomal terga narrowly yellowish brown translucent apically. Wings transparent, veins and stigma blackish brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: pronotal dorsum to lobe and metanotum sparsely tomentose. Disc of T 1 with sparse short hairs. Discs of T 2 – T 4 with moderately dense short hairs over entire surface. T 2 – T 3 with thin apical fimbriae, not clear in female. STRUCTURE AND SCULPTURE HEAD. Based on normal specimens (not cephalic polymorphism) Head nearly as long as wide; HW: HL = 1: 1.03. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.92: 0.79. IOD: OOD: OCD = 1: 0.93: 0.65. IAD: AOD = 1: 1.11. Ocellocular area moderately densely puctate, IS smooth (IS = 1 – 4 d). Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area slightly convex, weakly shiny, with moderately dense PP, IS weakly tessellate (IS = 1 – 2.5 d). CPL: CAL = 1: 0.87. Clypeus nearly flat, with moderately dense PP over entire sutface; IS smooth (IS = 1 – 3 d). EW: GW = 1: 1.04. Genal area on lower margin and postgena with straight ridges. Malar space linear. Hypostomal carinae nearly parallel. Mandible edentate. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 0.83; flagellum nearly flattened ventrally. THOARX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum with dense PP over entire surface; IS weakly tessellate on anterior half, nearly smooth on posterior half (IS = 0.5 – 2 d); parapsidal line a narrow groove. Mesoscutellum with sparser PP over entire surface; IS smooth (IS = 1 – 4 d). Metanotum weakly rugulose. Mesepisternum with moderately dense shallow PP on upper area and weak reticulate PP on lower area; IS smooth. SCL: MNL: MPL = 1: 0.53: 0.72. Propodeum: metapostnotum weakly shiny and gently inclined, with short straight ridges occupying anterior half and weakly tessellate on posterior half; junction between metapostnotum and posterior surface not carinate, weakly tessellate; lateral surface distinctly tessellate; posterior surface with lateral carina on lower half, without oblique carina. Coxae usual shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur serrate. Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 – T 3 with fine sparse PP. Disc of T 1 basally weakly lineolate or smooth (paratype and 1 ♂ lineolate, but 1 ♂ not lineolate). Disc of T 2 – T 3 weakly lineolate on anterior and posterior areas, and nearly smooth on medial area. Discs of T 4 with weak lineolation over entire surface. S 7 with moderately long, apically rounded median process. GENITALIA. Gonobase flat at bottom, ventral arms connected with each other at upper ends; gonocoxite smooth; ventral retrorse lobe tongue-like, moderately long but not reaching gonobase, with sparse short hairs ventrally.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB54FFEADCC5485CFBF0CAA9.taxon	distribution	Distribution Japan (northern to central Ryukyus: Kuro-shima Is., Iwo-jima Is., Take-shima Is., Yaku-shima Is., Kuchinoerabu-jima Is., Nakano-shima Is., Suwanose-jima Is., Akuseki-jima Is., Takara-jima Is.).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB54FFEADCC5485CFBF0CAA9.taxon	description	Flight period Female: April to October. Male: August to October. The flight records of male are based on the collecting data of the original description (Ebmer et al. 1994). Flower records Ampelopsis glandulosa (Wall.) Momiy. var. hancei (Planch.) Momiy. (Vitaceae), Artemisia indica Willd. var. maximowiczii (Nakai) H. Hara (Asteraceae), Psychotria serpens L. (Rubiaceae), and Sambucus racemosa L. subsp. sieboldiana (Miq.) H. Hara. (Adoxaceae).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB50FFD3DCA84983F946CA77.taxon	description	urn: lsid: zoobank. org: act: D 53 C 2563 - 540 A- 47 B 6 - BD 17 - 4 FDE 9 FF 7 BFAD Figs 10, 16 A – B, 17 E, 19 B, 20 F	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB50FFD3DCA84983F946CA77.taxon	diagnosis	Diagnosis Females are similar to L. (H.) epicinctus but are separated from them by the frons with sparse hairs (not mixed with tomentose hairs) and the ridges of the metapostnotum long (nearly reaching posterior margin as in Fig. 10 F). In contrast, in L. (H.) epicinctus, the frons is mixed with dense whitish tomentose hairs and the ridges of the metapostnotum are short (only present on basal area).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB50FFD3DCA84983F946CA77.taxon	etymology	Etymology The specific name is derived from ‘ Obake’, meaning ‘ ghost’ in Japanese. This species has been called “ Obake-chibi-kohanabachi ” in Japanese, hence its scientific name.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB50FFD3DCA84983F946CA77.taxon	materials_examined	Material examined Holotype JAPAN – Kyushu • ♀; Fukuoka Pref., Soeda-machi, Kyushu Univ., Hikosan Exp. St.; 33 ° 28 ′ 48.746 ″ N, 130 ° 54 ′ 55.452 ″ E; 18 Jul. 2014; R. Murao leg.; ELKU. [Verbatim label: JAPAN: Kyushu / Kyushu Univ., Hikosan Exp. St. / Soeda-machi / Fukuoka Pref. / 18. vii. 2014 / Ryuki Murao leg. // N 33 ° 28 ′ 48.746 ″ E 130 ° 54 ′ 55.452 ″ // HOLOTYPE // Lasiioglossum (Hemihalictus) spectrum Murao] Paratypes JAPAN – Honshu • 10 ♂♂; Iwate Pref., Morioka; 18 Jun. 1980; Y. Maeta leg., from nest; MNHAH • 20 ♂♂; same location as for preceding; 5 Jul. 1980; Y. Maeta leg., from nest; MNHAH • 11 ♂♂; Iwate Pref., Morioka, Kuriyagawa; 21 Jul. 1980; Y. Maeta leg., from nest; MNHAH • 3 ♂♂; same location as for preceding; 30 Jul. 1980; Y. Maeta leg., from nest; MNHAN • 2 ♂♂; same location as for preceding; 1 Aug. 1980; Y. Maeta leg., from nest; MNHAH • 1 ♀; Shimane Pref., Okinoshima Is., Nagaobana, Chibu; 36 ° N, 133 ° 03 ′ E; 28 Aug. 2014; K. Otsui leg.; cMur • 1 ♀; Shimane Pref., Oda, Mt Sanbe; 35 ° 9 ′ N, 132 ° 37 ′ E; 6 Aug. 2015; K. Otsui leg.; cMur. – Kyushu • 2 ♀♀; Fukuoka Pref., Soeda-machi, Kyushu Univ., Hikosan Exp. St.; 33 ° 28 ′ 48.746 ″ N, 130 ° 54 ′ 55.452 ″ E; 13 Jun. 2014; R. Murao leg., ELKU • 1 ♀; same location as for preceding; 19 Sep. 2013; R. Murao leg.; ELKU • 2 ♀♀; same location as for preceding; 23 May 2014; R. Murao leg.; ELKU • 2 ♀♀; same location as for preceding; 18 Jul. 2014; R. Murao leg.; ELKU • 2 ♀♀; Fukuoka Pref., Tagawa-gun, Soeda-machi, Mt Hiko-san; 33 ° 28 ′ 48.766 ″ N, 130 ° 54 ′ 55.452 ″ E – 33 ° 29 ′ 16.788 ″ N, 130 ° 54 ′ 56.461 ″ E; 17 Jul. 2014; R. Murao leg.; ELKU • 1 ♀; Hikosan (Buzen); 8 Jul. 1939; K. Yasumatsu leg.; ELKU; 1 ♀; same location as for preceding; 28 Jul. 1939; K. Yasumatsu leg.; ELKU • 1 ♀; Mt Hiko-san, Kajiya; 10 May 1973; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 4 Jun. 1973; K. Takeno leg.; ELKU • 1 ♀; Fukuoka Pref., Tagawa-gun, Nishi-Soeda; 18 Jun. 1968; K. Kanmiya leg.; ELKU • 1 ♀; Fukuoka, Mt Hiko; 4 May 1969; K. Kanmiya leg.; ELKU • 1 ♀; same location as for preceding; 11 Jul. 1969; K. Kanmiya leg.; ELKU • 1 ♀; same location as for preceding; 8 Jul. 1970; K. Nozato leg.; ELKU • 1 ♀; same location as for preceding; 2 May 1971; H. Makihara leg.; ELKU • 1 ♀; same location as for preceding; 7 Jul. 1971; M. T. Chujo leg.; ELKU • 2 ♀♀; same location as for preceding; 29 May 1972; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 1 Jun. 1972; K. Takeno leg.; ELKU • 2 ♀♀; same location as for preceding; 28 Apr. 1976; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 22 May 1980; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 14 Aug. 1980; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 13 Jun. 1969; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 21 Jun. 1966; A. Taketani leg.; ELKU • 2 ♀♀; same location as for preceding; 22 Jun. 1966; A. Taketani leg.; ELKU • 1 ♀; same location as for preceding; 23 Jun. 1966; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 25 Jun. 1966; A. Taketani leg.; ELKU • 1 ♀; same location as for preceding; 18 Jul. 1966; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 23 Jul. 1966; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 6 Aug. 1966; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 30 Aug. 1966; K. Takeno leg.; ELKU • 2 ♀♀; same location as for preceding; 15 May 1967; S. Kimoto leg.; ELKU • 1 ♀; same location as for preceding; 17 May 1967; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 25 May 1967; S. Kimoto leg.; ELKU • 1 ♀; same location as for preceding; 26 May 1967; S. Kimoto leg.; ELKU • 1 ♀; same location as for preceding; 3 Jun. 1967; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 4 Jul. 1967; K. Takeno leg.; ELKU • 1 ♀; same location as for preceding; 7 Jul. 1968; K. Kanmiya leg.; ELKU • 3 ♀♀; same location as for preceding; 21 Jul. 1968; K. Kanmiya leg.; ELKU • 1 ♀; same location as for preceding; 11 May 1971; Y. Hirashima leg.; ELKU • 1 ♀; same location as for preceding; 7 Jul. 1971; Y. Hirashima leg.; ELKU • 1 ♀; Fukuoka Pref., Fukuoka-shi, Nishi-ku, Genkaijima; 33 ° 41 ′ 24.799 ″ N, 130 ° 13 ′ 52.528 ″ E; 19 Jul. 2009; R. Murao leg.; ELKU • 1 ♀; Fukuoka Pref., Fukuoka-shi, Nishi-ku, Nagahama-kaigan; 33 ° 36 ′ 37.64 ″ N, 130 ° 15 ′ 34.919 ″ E; 2 Aug. 2009; R. Murao leg.; ELKU • 3 ♀♀; Fukuoka Pref., Ushikubi-dam, Ohnojyo-shi; 29 Jun. 2011; R. Murao leg.; ELKU • 1 ♀; Fukuoka Pref., Fukuoka-shi, Sawara-ku, Shiibaru; 3 May 2010; R. Murao leg.; ELKU • 2 ♀♀; Fukuoka Pref., Chikushino-shi, Kouzono, Ônejiyama-rindo; 4 Jul. 2009; R. Murao leg.; ELKU • 1 ♀; Fukuoka Pref., Fukuoka-shi, Higashi-ku, Shikanoshima; 14 Apr. 2013; R. Murao leg.; ELKU • 1 ♀; Saga Pref., Tosu-shi, Mt Kusenbu-yama; 33 ° 25 ′ 1.353 ″ N, 130 ° 26 ′ 46.819 ″ E; 6 Jun. 2010; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 12 Jun. 2010; R. Murao leg.; ELKU • 3 ♀♀; same location as for preceding; 19 Sep. 2013; Y. Murao leg.; ELKU • 2 ♀♀; Oita Pref., Kusu-gun, Kokonoemachi, Chojyabaru; 33 ° 7 ′ 6.773 ″ N, 131 ° 13 ′ 49.331 ″ E; 1050 m a. s. l.; 13 Aug. 2010; Y. Murao leg.; ELKU; 3 ♀♀; same location as for preceding; 15 May 2011; R. Murao leg.; ELKU • 1 ♀; same location as for preceding; 12 Aug. 2011; R. Murao leg.; ELKU • 8 ♀♀; Kumamoto Pref., Aso-gun, Minamiasomura, near Kusasenri; 30 Jul. 2009; R. Murao leg.; ELKU • 1 ♀; Kumamoto Pref., Aso-shi, Aso-machi, Matoishi wilderness; 32 ° 55 ′ 46.305 ″ N, 130 ° 58 ′ 11.555 ″ E; 14 Aug. 2010; Y. Murao leg.; ELKU • 2 ♀♀; same location as for preceding; 5 Aug. 2013; Y. Murao leg.; ELKU • 1 ♀; Kumamoto Pref., Aso-gun, Minamiaso-mura, Asosannishi-eki; 30 Jul. 2009; R. Murao leg.; ELKU • 1 ♀; Kumamoto Pref., Aso- gun, Nishihara-mura, near Mt Tawara; 30 Jul. 2009; R. Murao leg.; ELKU. – Ryukyus • 1 ♀; Kagoshima Pref., Yaku-shima Is., Onoaida; 40 – 200 m a. s. l.; 27 May 1982; S. Ikudome leg.; KWC. Non-type material JAPAN – Hokkaido • 1 ♀; Hamakoshimizu; 27 May 1966; MNHA • 1 ♀; same location as for preceding; 28 May 1966; MNHAH • 2 ♀♀; same location as for preceding; 11 Jun. 1966; MNHAH • 1 ♀; same location as for preceding; 8 Jul. 1966; K. Yamauchi leg.; MNHAH • 1 ♀; same location as for preceding; 29 Sep. 1966; MNHAH • 2 ♀♀; same location as for preceding; 20 Jun. 1967; MNHAH • 2 ♀♀; same location as for preceding; 9 Aug. 1967; MNHAH • 1 ♀; Asahikawa, Inosawa; 10 Jun. 1969; MNHAH • 1 ♀; Yukomanbetsu; 9 Jul. 1968; MNHAH • 4 ♀♀; Ahosoro; 12 Jun. 2010; O. Tadauchi leg.; ELKU • 1 ♀; Ashoro-cho, Ashoro; 43 ° 20 ′ 0 ″ N, 143 ° 40 ′ 0 ″ E; 29 Jun. 2013; O. Tadauchi leg.; ELKU • 2 ♀♀; same location as for preceding; 2 Jul. 2013; O. Tadauchi leg.; ELKU • 1 ♀; Honbetsu-cho, Hobetsu; 43 ° 10 ′ 0 ″ N, 143 ° 35 ′ 0 ″ E; 1 Jul. 2013; O. Tadauchi leg.; ELKU. – Honshu • 1 ♀; Aomori Pref., Namioka, Mt Bonzyu; 29 May 1983; M. Yamada leg.; MNHAH • 1 ♀; same location as for preceding; 1 Aug. 1983; M. Yamada leg.; MNHAH • 2 ♀♀; Miyagi Pref., Rifu-cho; 24 May 1980; K. Gôukon leg.; MNHAH • 2 ♀♀; Ibaraki Pref., Mt Gozen-yama; 30 Jul. 1976; M. Kitsukawa leg.; MNHAH • 1 ♀; Shizuoka Pref., Ito-shi, Mt Omuro; 4 May 2005; K. Gôukon leg.; cGou • 2 ♀♀; Kyoto Pref., Botanical Garden, Kyoto Univ.; 3 Jun. 1986; T. Inoue leg.; MNHAH • 4 ♀♀; Hyogo Pref., Kita-ku, Ikuno-Doujyo-cho; 4 May 2008; R. Murao leg.; ELKU • 1 ♀; Shimane Pref., Mt Sanbe; 5 May 1992; T. Yamaguchi leg.; SULE • 1 ♀; same location as for preceding; 22 May 1992; T. Yamaguchi leg.; SULE • 1 ♀; same location as for preceding; 23 Aug. 1992; T. Yamaguchi leg.; SULE • 1 ♀; Shimane Pref., Campus of Shimane Univ.; 16 Jul. 1993; Y. Okajima leg.; SULE. – Kyushu • 1 ♀; Kumamoto Pref., Aso-gun, Choyo-son, Setaura; 30 Apr. 1986; M. Iwata leg.; AETU • 4 ♀♀; same location as for preceding; 8 May 1986; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 30 Jun. 1986; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 11 Jul. 1986; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 13 Sep. 1986; M. Iwata leg.; AETU • 2 ♀♀; same location as for preceding; 27 Apr. 1987; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 8 Jul. 1987; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 23 Jul. 1987; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 16 Nov. 1987; M. Iwata leg.; AETU • 3 ♀♀; same location as for preceding; 30 Apr. 1988; M. Iwata leg.; AETU • 2 ♀♀; same location as for preceding; 23 May 1988; M. Iwata leg.; AETU • 3 ♀♀; same location as for preceding; 13 Jun. 1988; M. Iwata leg.; AETU • 3 ♀♀; same location as for preceding; 11 Jul. 1988; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 12 Aug. 1988; M. Iwata leg.; AETU • 6 ♀♀; same location as for preceding; 17 Apr. 1989; M. Iwata leg.; AETU • 2 ♀♀; same location as for preceding; 27 Apr. 1989; M. Iwata leg.; AETU • 5 ♀♀; same location as for preceding; 8 May 1989; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 7 Jun. 1989; M. Iwata leg.; AETU • 8 ♀♀; same location as for preceding; 19 Jun. 1989; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 29 Jun. 1989; M. Iwata leg.; AETU • 6 ♀♀; same location as for preceding; 6 Jul. 1989; M. Iwata leg.; AETU • 2 ♀♀; same location as for preceding; 14 Jul. 1989; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 19 Jul. 1989; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 6 Aug. 1989; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 25 Sep. 1989; M. Iwata leg.; AETU • 1 ♀; same location as for preceding; 6 Oct. 1989; M. Iwata leg.; AETU • 1 ♀; Kumamoto Pref., Aso-gun, Nishihara-mura; 22 Apr. 2000; M. Murase leg.; AETU • 2 ♀♀; same location as for preceding; 29 May 2000; R. Murao leg.; AETU • 2 ♀♀; same location as for preceding; 12 May 2000; R. Murao and M. Murase leg.; AETU • 2 ♀♀; same location as for preceding; 20 May 2000; R. Murao and M. Murase leg.; AETU • 2 ♀♀; same location as for preceding; 29 May 2000; M. Murase leg.; AETU • 2 ♀♀; same location as for preceding; 6 Jul. 2000; R. Murao and M. Murase leg.; AETU • 2 ♀♀; same location as for preceding; 14 Jun. 2000; R. Murao leg.; AETU • 13 ♀♀; same location as for preceding; 26 Jun. 2000; R. Murao and M. Murase leg.; AETU • 2 ♀♀; same location as for preceding; 17 Jul. 2000; R. Murao leg.; AETU • 2 ♀♀; same location as for preceding; 8 Sep. 2000; M. Murase leg.; AETU • 14 ♀♀; Kumamoto Pref., Kikuchi-gun, Kikuyo-machi; 22 Apr. 2000; R. Murao and M. Murase leg.; AETU • 4 ♀♀; same location as for preceding; 29 Apr. 2000; R. Murao and M. Murase leg.; AETU • 13 ♀♀; same location as for preceding; 12 May 2000; R. Murao and M. Murase leg.; AETU • 23 ♀♀; same location as for preceding; 20 May 2000; R. Murao and M. Murase leg.; AETU • 26 ♀♀; same location as for preceding; 29 May 2000; R. Murao and M. Murase leg.; AETU • 19 ♀♀; same location as for preceding; 6 Jun. 2000; R. Murao and M. Murase leg.; AETU • 24 ♀♀; same location as for preceding; 14 Jun. 2000; R. Murao and M. Murase leg.; AETU • 26 ♀♀; same location as for preceding; 26 Jun. 2000; R. Murao and M. Murase leg.; AETU • 17 ♀♀; same location as for preceding; 6 Jul. 2000; R. Murao and M. Murase leg.; AETU • 13 ♀♀; same location as for preceding; 17 Jul. 2000; R. Murao and M. Murase leg.; AETU • 10 ♀♀; same location as for preceding; 26 Jul. 2000; R. Murao and M. Murase leg.; AETU • 9 ♀♀; same location as for preceding; 4 Aug. 2000; R. Murao and M. Murase leg.; AETU • 15 ♀♀; same location as for preceding; 16 Aug. 2000; R. Murao and M. Murase leg.; AETU • 3 ♀♀; same location as for preceding; 28 Aug. 2000; R. Murao and M. Murase leg.; AETU • 7 ♀♀; same location as for preceding; 8 Sep. 2000; R. Murao and M. Murase leg.; AETU • 6 ♀♀; same location as for preceding; 19. Sep. 2000; R. Murao and M. Murase leg.; AETU • 5 ♀♀; same location as for preceding; 1 Oct. 2000; R. Murao and M. Murase leg.; AETU • 11 ♀♀; same location as for preceding; 10 Oct. 2000; R. Murao and M. Murase leg.; AETU • 3 ♀♀; same location as for preceding; 19 Oct. 2000; R. Murao and M. Murase leg.; AETU • 3 ♀♀; same location as for preceding; 27 Oct. 2000; M. Murase leg.; AETU • 6 ♀♀; same location as for preceding; 6 Nov. 2000; R. Murao and M. Murase leg.; AETU • 3 ♀♀; Nagasaki Pref., Tsushima Is., Izuhara, Yora-Naiin; 13 May 2010; O. Tadauchi leg.; ELKU • 1 ♀; Nagasaki Pref., Tsushima Os., Izuhara, Konoda-Aren; 14 May 2010; O. Tadauchi leg.; ELKU.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB50FFD3DCA84983F946CA77.taxon	description	Description Female MEASUREMENTS (n = 5, unit mm). BL = 4.75 – 5.00 (4.88 ± 0.13), WL = 3.88 – 4.50 (4.25 ± 0.25), HL = 1.42 – 1.48 (1.45 ± 0.03), HW = 1.35 – 1.45 (1.41 ± 0.04), IOD = 0.26 (0.26 ± 0.00), OOD = 0.26 – 0.27 (0.26 ± 0.01), OCD = 0.16 (0.16 ± 0.00), UOD = 0.87 – 0.94 (0.90 ± 0.02), MOD = 1.03 – 1.06 (1.04 ± 0.03), LOD = 0.68 – 0.77 (0.74 ± 0.04), IAD = 0.13 – 0.15 (0.14 ± 0.01), AOD = 0.21 – 0.27 (0.25 ± 0.02), CAL = 0.24 – 0.27 (0.26 ± 0.01), CPL = 0.27 – 0.32 (0.29 ± 0.02), EL = 1.55 – 1.70 (1.62 ± 0.06), EW = 0.35 – 0.42 (0.39 ± 0.03), GW = 0.23 – 0.32 (0.27 ± 0.04), SPL = 0.55 – 0.60 (0.57 ± 0.02), F 1 L = 0.08 (0.08 ± 0.00), F 2 L = 0.08 (0.08 ± 0.00), F 3 L = 0.08 (0.08 ± 0.00), F 2 W = 0.11 – 0.13 (0.12 ± 0.01), MsW = 1.55 – 1.80 (1.67 ± 0.10), SCL = 0.35 – 0.38 (0.37 ± 0.01), MNL = 0.18 – 0.23 (0.20 ± 0.02), MPL = 0.28 (0.28 ± 0.00), MtW = 1.65 – 1.85 (1.74 ± 0.08). COLORATION. Body black except for the following parts: mandible reddish brown apically; F 4 – F 10 brown (holotype) or yellowish brown ventrally; tegula yellowish brown translucent; tibial spur yellow; metasomal terga broadly yellowish brown translucent apically. Wings transparent, veins and stigma brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: pronotal dorsum to lobe and metanotum moderately densely tomentose; hind trochanter, femur, and tibia mixed with plumose hairs, forming scopa. Disc of T 1 with sparse short hairs on medial area. Discs of T 2 – T 4 with moderately dense short hairs over entire surface. STRUCTURE AND SCULPTURE HEAD. Nearly as long as wide; HW: HL = 1: 1.03. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.87: 0.71. IOD: OOD: OCD = 1: 1.03: 0.63. IAD: AOD = 1: 1.83. Ocellocular area densely puctate, IS nearly smooth (IS = 0.5 – 2 d). Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area slightly convex, weakly shiny, with dense PP; IS weakly tessellate (IS = 0.5 – 2 d). CPL: CAL = 1: 0.89. Clypeus nearly flat, with reticulate PP on upper half and larger shallow PP on lower half; IS nearly smooth over entire surface (IS = 0.5 – 1 d on lower area). EW: GW = 1: 0.70. Genal area to postgena with weak straight ridges. Malar space linear. Occiput not carinate. Hypostomal carinae nearly parallel. Mandible bidentate. Labrum (Fig. 10 D): basal area approximately 1.9 × as wide as long; distal process approximately 0.6 × as long as basal area, tonguelike, and without lateral projection; distal keel pointed apically. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 1.44; flagellum nearly flattened ventrally. THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum (Fig. 10 E) with dense PP over entire surface; IS distinctly tessellate on anterior half, and weakly tessellate on posterior half (but nearly smooth on posterior margin) (IS = 0.5 – 2 d); parapsidal line a narrow groove. Mesoscutellum with moderately dense PP over entire surface; IS nearly smooth (holotype and some paratypes) or weakly tessellate (two paratypes) over entire surface (IS = 0.5 – 3 d). Metanotum weakly rugulose. Mesepisternum reticulate-punctate over entire surface. SCL: MNL: MPL = 1: 0.55: 0.75. Propodeum: metapostnotum (Fig. 10 F) dimly shiny and gently inclined, with straight ridges occupying anterior ⅔ (holotype and some paratypes) or on anterior half, with coarse tessellation on posterior ⅓ or half; junction between metapostnotum and posterior surface not carinate, coarsely tessellate; lateral surface weakly rugulae and coarsely tessellate; posterior surface with lateral carina on lower half, without oblique carina. Coxae normal shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur pectinate, with 2 – 3 teeth as in Fig. 20 F (n = 10). Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 with weak lineolation on basal and apical areas (not overlapping in puncture zone on medial area) (Fig. 16 A), and with sparse fine PP on medial area. Disc of T 2 with weak lineolation on basal and apical area, and without lineolation on medial area. T 3 – T 4 weakly lineolate over entire surface. Male MEASUREMENTS (n = 5, unit mm). BL = 3.62 – 4.54 (4.32 ± 0.43), WL = 3.08 – 3.77 (3.58 ± 0.27), HL = 1.20 – 1.38 (1.32 ± 0.07), HW = 1.20 – 1.40 (1.32 ± 0.07), IOD = 0.20 – 0.24 (0.23 ± 0.02), OOD = 0.24 – 0.29 (0.27 ± 0.01), OCD = 0.16 – 0.20 (0.17 ± 0.02), UOD = 0.82 – 0.91 (0.88 ± 0.03), MOD = 0.84 – 0.98 (0.93 ± 0.05), LOD = 0.58 – 0.67 (0.63 ± 0.04), IAD = 0.13 – 0.20 (0.16 ± 0.02), AOD = 0.18 – 0.22 (0.21 ± 0.02), CAL = 0.20 – 0.27 (0.23 ± 0.02), CPL = 0.27 – 0.33 (0.30 ± 0.02), EL = 0.87 – 0.98 (0.95 ± 0.04), EW = 0.38 – 0.44 (0.42 ± 0.02), GW = 0.24 – 0.33 (0.28 ± 0.03), SPL = 0.36 – 0.42 (0.39 ± 0.02), F 1 L = 0.09 – 0.13 (0.11 ± 0.01), F 2 L = 0.13 – 0.16 (0.15 ± 0.01), F 3 L = 0.13 – 0.16 (0.15 ± 0.01), F 2 W = 0.11 – 0.13 (0.12 ± 0.01), MsW = 1.16 – 1.32 (1.26 ± 0.06), SCL = 0.29 – 0.33 (0.32 ± 0.02), MNL = 0.16 (0.16 ± 0.00), MPL = 0.20 – 0.22 (0.21 ± 0.01), MtW = 1.03 – 1.26 (1.17 ± 0.08). COLORATION. Body black except for the following parts: lower half of clypeus yellow; mandible yellow except for apically reddish; labrum yellow; F 1 yellowish brown or brown ventrally; pronotal lobe yellowish brown; tegula yellow translucent; tibiae basally and apically yellow; tibial spur yellow; tarsi yellow; metasomal terga broadly yellowish brown translucent apically. Wings transparent, veins and stigma pale brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: paraocular area, pronotal dorsum to lobe thinly tomentose. Metasomal terga with sparse, simple and short hairs over entire surface. STRUCTURE AND SCULPTURE HEAD. Nearly as long as wide; HW: HL = 1: 1.00. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.94: 0.68. IOD: OOD: OCD = 1: 0.94: 0.68. IAD: AOD = 1: 1.43. Ocellocular area with dense PP, IS nearly smooth (IS = 0.5 – 2 d). Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area and clepeus nearly flat, weakly shiny, with moderately dense PP; IS smooth (IS = 0.5 – 4 d). CPL: CAL = 1: 0.76. EW: GW = 1: 0.67. Genal area with weak straight ridges. Malar space linear. Occiput not carinate. Hypostomal carinae nearly parallel. Postgena longitudinal lineolate. Mandible edentate. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 0.76; flagellum nearly flattened ventrally. THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum with dense PP over entire surface; IS smooth except for anteriorly weakly tessellate (IS = 0.5 – 2 d); parapsidal line a narrow groove. Mesoscutellum with moderately dense PP over entire surface; IS smooth (IS = 0.5 – 4 d). Metanotum weakly rugulose. Mesepisternum with dense PP over entire surface; IS smooth (IS = 0.5 – 1 d). SCL: MNL: MPL = 1: 0.49: 0.68. Propodeum: metapostnotum shiny and gently inclined, with short straight ridges occupying anterior half or anterior ⅔, weakly tessellate or nearly smooth on posterior half or posterior ⅓; junction between metapostnotum and posterior surface not carinate, weakly tessellate or nearly smooth; lateral surface weakly rugulose and distinctly tessellated; posterior surface with lateral carina on lower half, without oblique carina. Coxae normal shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg weakly carinate marginally. Inner hind tibial spur serrate. Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 without distinct PP and tessellation. Disc of T 2 – T 4 with moderately dense fine PP, T 2 without lineolation, T 3 – T 4 with weak lineolation on apical margin. S 7 with moderately long, apically rounded median process. GENITALIA. Gonobase flat at bottom; gonocoxite smooth; ventral retrorse lobe tongue-like, moderately long but not reaching gonobase, with sparse short hairs ventrally. Variation Disc of T 1 lineolate only on basal area (Fig. 16 B) in the specimens (not type series) collected from Hokkaido (northern Japan).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB50FFD3DCA84983F946CA77.taxon	distribution	Distribution Japan (Hokkaido, Honshu, Shikoku, Kyushu, Izu-shotô Islands, Tsu-shima Is., northern Ryukyus). Records of Lasioglossum (Hemihalictus) pallilomum (Strand, 1914) from the nearby continent, such as the Korean Peninsula, Russian Far East, and China (Ebmer 1978 a, 1996, 2006), may correspond to this new species.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB50FFD3DCA84983F946CA77.taxon	description	Flight period Female: April to Novemver. Males are collected from June to August based on 46 male specimens in the late Dr Sakagami’s collection (MNHAH). These specimens were collected from the nest of this species (identified as L. (H.) pallilomum (Strand, 1914 )). Flower records The specimens examined in this paper were collected on the flowers of 61 species in 30 families as follows. Acanthaceae: Justicia hayatae Yamam. Amaranthaceae: Achyranthes bidentata Blume var. japonica Miq. Apiaceae: Coelopleurum gmelinii (DC.) Ledeb. Asparagaceae: Barnardia japonica (Thunb.) Schult. & Schult. f. Asteraceae: Achillea alpina L. subsp. japonica (Heimerl) Kitam.; Aster iinumae Kitam.; Crepidiastrum denticulatum (Houtt.) J. H. Pak & Kawano; Erigeron annuus (L.) Pers.; Erigeron sumatrensis Retz.; Ixeridium dentatum (Thunb.) Tzvelev subsp. dentatum; Ixeris stolonifera A. Gray; Lactuca indica L.; Picris hieracioides L. subsp. japonica (Thunb.) Krylov; Youngia japonica (L.) DC. Brassicaceae: Brassica rapa L. var. oleifera DC.; Rorippa indica (L.) Hiern. Campanulaceae: Lobelia chinensis Lour.; Triodanis perfoliata (L.) Nieuwl. Caprifoliaceae: Lonicera japonica Thunb. Commelinaceae: Commelina communis L. Convolvulaceae: Ipomoea lacunosa L. Cucurbitaceae: Cucurbita sp. Elaeagnaceae: Elaeagnus umbellata Thunb. var. umbellate. Elatinaceae: Stellaria sp. Fabaceae: Astragalus sinicus L.; Pueraria lobata (Willd.) Ohwi; Trifolium dubium Sibth. Gentianaceae: Gentiana zollingeri Fawc. Geraniaceae: Geranium carolinianum L. Lamiaceae: Clinopodium gracile (Benth.) Kuntze; Isodon inflexus (Thunb.) Kudô; Lamium amplexicaule L.; Prunella vulgaris L. subsp. asiatica (Nakai) H. Hara. Mazaceae: Mazus pumilus (Burm. f.) Steenis. Oleaceae: Ligustrum japonicum Thunb. Oxalidaceae: Oxalis corniculata L.; Oxalis debilis Kunth subsp. corymbosa (DC.) Lourteig. Plantaginaceae: Veronica persica Poir. Polygonaceae: Fallopia japonica (Houtt.) Ronse Decr. var. japonica; Persicaria longiseta (Bruijn) Kitag. Portulaceae: Portulaca oleracea L. Primulaceae: Lysimachia clethroides Duby. Ranunculaceae: Ranunculus japonicus Thunb.; Ranunculus silerifolius H. Lév. var. glaber (H. Boissieu) Tamura. Rosaceae: Malus pumila Mill.; Potentilla anemonifolia Lehm.; Potentilla fragarioides L. var. major Maxim.; Potentilla hebiichigo Yonek. & H. Ohashi; Rosa luciae Rochebr. et Franch. ex Crèp.; Rosa onoei Makino var. hakonensis (Franch. & Sav.) H. Ohba; Rosa rugosa Thunb.; Rubus buergeri Miq.; Rubus hirsutus Thunb.; Rubus palmatus Thunb. var. palmatus; Rubus parvifolius L. Rubiaceae: Paederia foetida L. Rutaceae: Zanthoxylum schinifolium Siebold & Zucc. Solanaceae: Lycium chinense Mill.; Solanum nigrum L. Vitaceae: Ampelopsis glandulosa (Wall.) Momiy. var. heterophylla (Thunb.) Momiy.; Vitis ficifolia Bunge. Habitat This species has been collected from various environments such as cultivated or urban areas in the lowlands, seaside, mountain areas, and semi-natural grassland. The type locality is shown in Fig. 19 B.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB50FFD3DCA84983F946CA77.taxon	discussion	Comments In Japan, this species has been identified as L. (H.) pallilomum (Strand, 1914), which might be endemic to Taiwan.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB69FFDFDCE749C5F998CF95.taxon	description	Figs 11, 16 C, 17 F, 20 G	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB69FFDFDCE749C5F998CF95.taxon	diagnosis	Diagnosis Females are separated from other members of the sexstrigatus group occurring in Japan by a combination of the following character states: head relatively longer than wide (length / width ratio 1.07); metasoma entirely black; metasomal terga with white fimbriae on latero-apical margins; and disc of T 1 basally to medially with distinct lineolation (Fig. 16 C) (Murao 2017 a).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB69FFDFDCE749C5F998CF95.taxon	materials_examined	Material examined Holotype RUSSIA – Siberia • ♀; Preobrageniya Bay; 12 Jul.; USNM. Other material JAPAN – Hokkaido • 1 ♀; Ashoro-cho, Ashoro; 43 ° 20 ′ 0 ″ N, 143 ° 40 ′ 0 ″ E; 2 Jul. 2013; O. Tadauchi leg.; ELKU • 1 ♀; Honbetsu-cho, Senbiri; 43 ° 35 ′ 0 ″ N, 143 ° 35 ′ 0 ″ E; 1 Jul. 2013; O. Tadauchi leg.; ELKU • 1 ♀; Ikeda (Tokachi); 14 – 16 Jul. 1953; Y. Hirashima leg.; ELKU • 2 ♀♀; Sapporo, Barato; 21 Jun. 1973; M. Matsumoto leg.; MNHAH • 2 ♀♀; same location as for preceding; 28 Jun. 1973; M. Matsumoto leg.; MNHAH • 1 ♀; same location as for preceding; 22 Jul. 1973; M. Matsumoto leg.; MNHAH • 1 ♀; same location as for preceding; 3 Aug. 1973; M. Matsumoto leg.; MNHAH • 2 ♀♀; Hamakoshimizu; 19 Jun. 1966; H. Fukuda leg.; MNHAH • 7 ♀♀; same location as for preceding; 26 Jul. 1966; H. Fukuda leg.; MNHAH • 1 ♀; same location as for preceding; 27 Jul. 1966; H. Fukuda leg.; MNHAH • 7 ♀♀; same location as for preceding; 27 Sep. 1966; H. Fukuda leg.; MNHAH • 6 ♀♀; same location as for preceding; 28 Sep. 1966; H. Fukuda leg.; MNHAH • 2 ♀♀; same location as for preceding; 19 Jun. 1967; H. Fukuda leg.; MNHAH • 4 ♀♀; same location as for preceding; 6 Jul. 1967; H. Fukuda leg.; MNHAH • 1 ♀; Asahikawa, Inosawa; 25 Jun. 1969; MNHAH • 12 ♀♀; same location as for preceding; 27 Jun. 1969; MNHAH • 8 ♀♀; same location as for preceding; 13 Jul. 1969; MNHAH • 2 ♀♀; same location as for preceding; 26 Aug. 1969; MNHAH • 1 ♀; same location as for preceding; 10 Jun. 1970; MNHAH • 2 ♀♀; same location as for preceding; 25 Jul. 1970; MNHAH • 1 ♀; same location as for preceding; 11 Aug. 1970 MNHAH • 3 ♀♀; Sapporo; 16 Jul. 1968; S. F. Sakagami leg.; MNHAH • 3 ♀♀; same location as for preceding; 23 Jul. 1968; S. F. Sakagami leg.; MNHAH • 1 ♀; same location as for preceding; 3 Aug. 1968; S. F. Sakagami leg.; MNHAH • 1 ♀; Tobetsu; 9 Jul. 1974; M. Ishikawa leg.; MNHAH • 1 ♀; Sapporo, Hokkaido University Campus; 6 Jun. 1959; S. F. Sakagami leg.; MNHAH • 1 ♀; same location as for preceding; 11 Jun. 1959; S. F. Sakagami leg.; MNHAH • 1 ♀; same location as for preceding; 26 Jun. 1959 S. F. Sakagami leg.; MNHAH • 3 ♀♀; same location as for preceding; 30 Jun. 1959; S. F. Sakagami leg.; MNHAH • 1 ♀; same location as for preceding; 5 Jul. 1959; S. F. Sakagami leg.; MNHAH • 1 ♀; same location as for preceding; 6 Jul. 1959; S. F. Sakagami leg.; MNHAH • 3 ♀♀; same location as for preceding; 14 Jul. 1959; S. F. Sakagami leg.; MNHAH • 2 ♀♀; same location as for preceding; 2 Sep. 1959; S. F. Sakagami leg.; MNHAH • 4 ♀♀; same location as for preceding; 9 Sep. 1959; S. F. Sakagami leg.; MNHAH. – Honshu • 1 ♀; Aomori Pref., Misawa, Amagamori; 21 Jul. 1986; M. Yamada leg.; MNHAH • 1 ♀; Ibaraki Pref., Tsukuba, Kouyadai; 24 Jul. 1989; T. Matsumura leg.; MNHAH • 2 ♀♀; Tottori Pref., Seihaku-gun, Daisen-cho; 16 Jul. 2004; T. Sugimoto leg.; cMur • 1 ♀; Okayama Pref., Soujya-shi; 5 Jul. 2006; Y. Kenmotsu leg.; ELKU • 1 ♀; Hiroshima Pref., Asida river; 17 May 1997; S. Nakamura leg.; ELKU. – Izu Islands • 2 ♀♀; Hachijo Is., Okago-Sokoto; 27 May 1964; Y. Hirashima and M. Shiga leg.; ELKU • 2 ♀♀; same location as for preceding; 5 Jun. 1964; Y. Hirashima and M. Shiga leg.; ELKU. – Kyushu • 3 ♀♀; Kumamoto Pref., Aso-gun, Aso-machi, near Mt Komezuka; 23 Jul. 2004; R. Murao and T. Sugimoto leg.; cMur • 1 ♀, Kumamoto Pref., Kikuchigun, Ohzu; 2 Jul. 2003; M. Ishida leg.; AETU • 1 ♀; same location as for preceding; 14 Jul. 2003; M. Ishida leg.; AETU • 2 ♀♀; Kumamoto Pref., Aso-gun, Ichinomiya-machi, Tateyamabokuya; 22 Jul. 2004; R. Murao leg.; cMur • 1 ♀; Kumamoto Pref., Aso-gun, Aso-machi, Yamadaseibubokuya; 22 Jul. 2004; T. Sugimoto leg.; cMur.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB69FFDFDCE749C5F998CF95.taxon	description	Redescription Female MEASUREMENTS (n = 5, unit mm). BL = 4.50 – 5.00 (4.85 ± 0.21), WL = 4.38 – 4.63 (4.50 ± 0.13), HL = 1.48 – 1.61 (1.55 ± 0.05), HW = 1.39 – 1.48 (1.45 ± 0.04), IOD = 0.26 – 0.31 (0.28 ± 0.02), OOD = 0.26 – 0.29 (0.28 ± 0.01), OCD = 0.16 – 0.19 (0.18 ± 0.01), UOD = 0.90 – 1.00 (0.96 ± 0.04), MOD = 1.06 – 1.13 (1.08 ± 0.03), LOD = 0.74 – 0.84 (0.80 ± 0.04), IAD = 0.11 – 0.15 (0.13 ± 0.01), AOD = 0.27 – 0.29 (0.28 ± 0.01), CAL = 0.27 – 0.31 (0.30 ± 0.02), CPL = 0.27 – 0.34 (0.32 ± 0.03), EL = 1.65 – 1.75 (1.70 ± 0.05), EW = 0.35 – 0.39 (0.37 ± 0.02), GW = 0.23 – 0.35 (0.31 ± 0.05), SPL = 0.56 – 0.61 (0.59 ± 0.03), F 1 L = 0.08 – 0.11 (0.09 ± 0.01), F 2 L = 0.08 – 0.29 (0.08 ± 0.00), F 3 L = 0.08 (0.08 ± 0.00), F 2 W = 0.11 – 0.15 (0.13 ± 0.01), MsW = 1.70 – 1.85 (1.75 ± 0.06), SCL = 0.35 – 0.43 (0.38 ± 0.03), MNL = 0.15 – 0.20 (0.19 ± 0.02), MPL = 0.20 – 0.28 (0.25 ± 0.03), MtW = 1.70 – 2.00 (1.83 ± 0.11). COLORATION. Body black except for the following parts: mandible reddish brown apically; F 8 – F 10 or F 6 – F 10 yellowish brown ventrally; tegula yellowish brown translucent; tibial spur yellow; metasomal terga broadly yellowish brown translucent apically. Wings transparent, veins and stigma blackish brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: pronotal dorsum to lobe and metanotum densely tomentose; hind trochanter, femur, and tibia mixed with plumose hairs, forming scopa. Disc of T 1 with sparse short hairs on medial and posterior areas. Discs of T 2 – T 4 with moderately dense short hairs over entire surface. STRUCTURE AND SCULPTURE HEAD. Slightly longer than wide; HW: HL = 1: 1.07. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.89: 0.74. IOD: OOD: OCD = 1: 1: 0.66. IAD: AOD = 1: 2.18. Ocellocular area densely puctate, IS smooth (IS = 0.5 – 1.5 d). Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area slightly convex, weakly shiny, with moderately dense PP, IS nearly smooth (IS = 0.5 – 4 d). CPL: CAL = 1: 0.94. Clypeus nearly flat, with dense PP on upper half and larger shallow PP on lower half; IS smooth over entire surface (IS = 0.5 – 1 d on upper half). EW: GW = 1: 0.84. Genal area to postgena with straight ridges. Malar space linear. Occiput not carinate. Hypostomal carinae nearly parallel. Mandible bidentate. Labrum (Fig. 11 C): basal area approximately 1.8 × as wide as long; distal process approximately 0.6 × as long as basal area, tongue-like, and without lateral projection; distal keel pointed apically. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 1.56; flagellum nearly flattened ventrally. THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum (Fig. 11 D) with dense PP over entire surface; IS weakly tessellate on anterior half, and nearly smooth on posterior half (IS = 0.5 – 3 d); parapsidal line a narrow groove. Mesoscutellum with sparse PP on submedian area and denser PP on marginal area; IS smooth over entire surface (IS = 1 – 4 d on submedian area, and 0.5 – 1.5 d on marginal area). Metanotum weakly rugulose. Mesepisternum with reticulate PP over entire surface. SCL: MNL: MPL = 1: 0.49: 0.64. Propodeum: metapostnotum (Fig. 11 E) weakly shiny and gently inclined, with nearly straight ridges reaching posterior area; junction between metapostnotum and posterior surface not carinate, weakly tessellate; lateral surface weakly rugulose; posterior surface with lateral carina on lower half, without oblique carina. Coxae normal shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur with 3 – 4 slender teeth as in Fig. 20 G (n = 6). Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 with moderately dense distinct PP on medial area and with lineolation on anterior and medial areas (lineolation reaching punctate zone on medial area, but interrupted on submedial patch) (Fig. 16 C). Disc of T 2 – T 3 nearly smooth on medial area, and very weakly lineolate on remaining part. Disc of T 4 with very weak lineolation over entire surface. Male Not examined in the present study. Variation Disc of T 1 distinctly lineolate over entire surface in three specimens collected from Hachijo Is., Japan.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB69FFDFDCE749C5F998CF95.taxon	distribution	Distribution Japan (Hokkaido, Honshu, Kyushu, Izu-shotô Islands), Korean Peninsula, Russian Far East, China.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB69FFDFDCE749C5F998CF95.taxon	description	Flight period Female: June to September. Males have been collected from July to August in the Korean Peninsula (Ebmer 1978 b). Flower records The specimens examined in this paper were collected on the flowers of 26 species in 13 families as follows. Apiaceae: Aegopodium podagraria L. Araliaceae: Aralia cordata Thunb. Asteraceae: Argyranthemum frutescens (L.) Sch. Bip.; Erigeron annuus (L.) Pers.; Hieracium umbellatum L.; Inula salicina L. var. asiatica Kitam.; Leontodon taraxacoides (Vill.) Mérat; Picris hieracioides L. subsp. japonica (Thunb.) Krylov; Rudbeckia laciniata L.; Solidago virgaurea L. subsp. leiocarpa (Benth.) Hultén; Sonchus brachyotus DC.; Sonchus sp.; Taraxacum sp. Brassicaceae: Brassica rapa L. var. oleifera DC. Convolvulaceae: Calystegia pubescens Lindl. Fabaceae: Trifolium pratense L.; Trifolium repens L. Geraniaceae: Geranium sp.; Geranium yesoense Franch. & Sav. var. pseudopalustre Nakai. Hypericaceae: Hypericum erectum Thunb. Lamiaceae: Lavandula angustifolia Mill. Oxalidaceae: Oxalis corniculata L. Ranunculaceae: Ranunculus repens L. Rosaceae: Rosa multiflora Thunb.; Rosa rugosa Thunb. Rubiaceae: Galium verum L. subsp. asiaticum (Nakai) T. Yamaz. var. asiaticum Nakai f. lacteum (Maxim.) Nakai.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB65FFD9DC324CA5FC3BCFA5.taxon	description	Figs 12, 16 D, 18 A, 20 H	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB65FFD9DC324CA5FC3BCFA5.taxon	diagnosis	Diagnosis Females are similar to L. (H.) eidmanni (Blüthgen, 1930). According to Sakagami & Tadauchi (1995), this species is only separated from L. (H.) eidmanni by the metasomal terga without distinct apical fimbriae. In contrast, in L. (H.) eidmanni, the metasomal terga have more or less dense and welldeveloped apical fimbriae.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB65FFD9DC324CA5FC3BCFA5.taxon	materials_examined	Material examined Paratypes JAPAN – Honshu • 2 ♀♀; Iwate Pref., Takizawa, Exp. For.; 27 Jul. 1976; Y. Maeta and T. Matsumura leg.; MNHAH • 1 ♀; Kyoto Pref., Ashu; 19 Jul. 1984; T. Inoue, T. Ichino, H. Ichihashi and M. Kato leg.; MNHAH • 1 ♀; Kyoto Pref., Kibune, Asoga; 28 Jun. 1984; M. Kato leg.; MNHAH. Other material JAPAN – Honshu • 1 ♀; Akita Pref., Omonogawa-machi, Fukai; 7 Jun. 1978; K. Baba and N. Kato leg.; ELKU • 1 ♀; Iwate Pref., Morioka, Kuriyagawa; 2 Jun. 1964; Y. Maeta leg.; ELKU • 1 ♀; same location as for preceding; 23 Jun. 1964; Y. Maeta leg.; ELKU • 1 ♀; Miyagi Pref., Onoda-cho, Arasawa; 29 Jun. 2000; K. Gôukon leg.; cGou • 1 ♀; Miyagi Pref., Kawatabi; 22 Jun. 1986; K. Gôukon leg.; cGou • 1 ♀; Yamagata Pref., Oguni-machi, Tamagawa; 24 Jun. 1981; K. Baba leg.; ELKU • 1 ♀; Fukushima Pref., Kôriyama, Nakayama; 23 May 1975; O. Tadauchi leg.; ELKU • 1 ♀; Tochigi Pref., Nasu-machi, Moriko; 22 May 1975; O. Tadauchi leg.; ELKU • 1 ♀; Gunma Pref., Naganohara, Asamabokujyo; 19 Jul. 1967; T. and H. Suda leg.; ELKU • 1 ♀; Niigata Pref., Miomote; 13 Jun. 1977; K. Baba leg.; ELKU • 1 ♀; same location as for preceding; 10 Jul. 1981; K. Baba leg.; ELKU • 1 ♀; Niigata Pref., Kurokawa; 9 Aug. 1970; K. Baba leg.; ELKU • 2 ♀♀; same location as for preceding; 8 Jul. 1981; K. Baba leg.; ELKU • 1 ♀; same location as for preceding; 23 May 1985; K. Baba leg.; ELKU • 1 ♀; same location as for preceding; 16 Jul. 1985; K. Baba leg.; ELKU • 1 ♀; Niigata Pref., Asahi, Koage; 15 Jun. 1985; K. Baba leg.; ELKU • 2 ♀♀; Niigata Pref., Senami; 17 Jun. 1977; K. Baba leg.; ELKU • 1 ♀; same location as for preceding; 23 Jun. 1985; K. Baba leg.; ELKU • 1 ♀; Niigata Pref., Shibatashi, Kawahigashi; 22 May 1977; K. Baba leg.; ELKU • 1 ♀; Niigata Pref., Yuzawa, Mitsumata; 19 Jun. 1977; K. Baba leg.; ELKU • 1 ♀; Niigata Pref., Yuzawa-machi, Hiuchi-toge; 20 Jun. 1982; K. Baba leg.; ELKU • 3 ♀♀; Niigata Pref., Asahi, Waseda; 23 May 1985; K. Baba leg.; ELKU • 1 ♀; Yamanashi Pref., near Kawaguchi-ko, Misaka-touge; 25 Aug. 1971; H. Suda leg.; ELKU • 3 ♂♂; Nagano Pref., Aburakisawa; 5 Sep. 2014; S. Sawada leg.; cMur • 1 ♀; Ishikawa Pref., Shishiku; 3 Sep. 1972; I. Togashi leg.; ELKU. – Kyushu • 2 ♀♀; Miyazaki Pref., Ebino-Kobayashi-shi; 2 Jun. 2002; K. Mitai leg.; cMur.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB65FFD9DC324CA5FC3BCFA5.taxon	distribution	Distribution Japan (Hokkaido, Honshu, Izu-shotô Islands, Shikoku, Kyushu, Tsu-shima Is., northern Ryukyus).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB65FFD9DC324CA5FC3BCFA5.taxon	description	Flight period Female: April to October. Male: August to October. The flight records of male are based on the collection data of the original description of this species (Sakagami & Tadauchi 1995). Flower records Astilbe odontophylla Miq. (Saxifragaceae), Deutzia crenata Siebold & Zucc. (Hydrangeaceae), Hydrangea serrata (Thunb.) Ser. var. serrata (Hydrangeaceae), Persicaria manshuricola Kitag. (Polygonaceae), and Taraxacum officinale Weber ex F. H. Wigg. (Asteraceae).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB63FFDADCB64C8AFA23CC7A.taxon	description	urn: lsid: zoobank. org: act: D 4408 B 7 F- 6 A 84 - 4 BB 2 - 8 B 5 D- 8 B 9 FDF 35 E 031 Figs 13, 16 E, 18 B	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB63FFDADCB64C8AFA23CC7A.taxon	diagnosis	Diagnosis Females are similar to L. (H.) simplicior but are separated from them by the lineolation of T 1 interrupted in part (Fig. 16 E). In contrast, in L. (H.) simplicior, the lineolation of T 1 is present across the entire surface (Fig. 15 E).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB63FFDADCB64C8AFA23CC7A.taxon	etymology	Etymology The specific name is derived from this species’ similarity to L. (H.) simplicior (Cockerell, 1931).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB63FFDADCB64C8AFA23CC7A.taxon	materials_examined	Material examined Holotype JAPAN – Kyushu • ♀; Oita Pref., Kusu-gun, Kokonoe-machi, Chojyabaru; 33 ° 7 ′ 6.773 ″ N, 131 ° 13 ′ 49.331 ″ E; 1050 m a. s. l.; 13 Aug. 2010; Y. Murao leg.; ELKU. [Verbatim label: JAPAN: Kyushu / Chojyabaru / Kokonoe-machi / Kusu-gun / Oita Pref. / 13. VIII. 2010 / Yumi Murao leg. / / HOLOTYPE / / Lasiioglossum (Hemihalictus) subsimplicior Murao] Paratypes JAPAN – Hokkaido • 4 ♀♀; Antaroma-Aizankei (Ishikari); 26 Jul. 1952; T. Shirôzu leg.; ELKU. – Honshu • 1 ♀; Ishikawa Pref., Negami-machi, Yamaguchi; 29 Aug. 1996; I. Togashi leg.; ELKU. – Kyushu • 1 ♀; Oita Pref., Kokonoe-machi, Chojyabaru; 33 ° 7 ′ 6.773 ″ N, 131 ° 13 ′ 49.331 ″ E; 1050 m a. s. l.; 13 Aug. 2010; R. Murao leg.; cMur • 2 ♀♀; Oita Pref., Kusu-gun, Kokonoe-machi, Handa-kogen; 33 ° 7 ′ 58.702 ″ N, 131 ° 14 ′ 2.412 ″ E; 9 Jul. 2013; R. Murao leg.; ELKU • 1 ♀; Oita Pref., Takeda, Nagayu; 28 Apr. 2009; O. Tadauchi leg.; ELKU • 1 ♀; Oita Pref., Mt Kuju; 9 May 2009; O. Tadauchi leg.; ELKU • 2 ♀♀; same location as for preceding; 23 May 2009; O. Tadauchi leg.; ELKU • 2 ♀♀; Oita Pref., Shimohanda; 12 Apr. 1975; O. Tadauchi leg.; ELKU • 1 ♀; Miyaji-Bochu (Mt Aso); 23 Jun. 1959; Y. Hirashima leg.; ELKU • 1 ♀; Kumamoto Pref., Aso-machi, Aso; 28 May 2001; A. Yamada leg.; ELKU • 1 ♀; same location as for preceding; 16 Jun. 2001; A. Yamada leg.; ELKU • 1 ♀; Miyazaki Pref., Takachiho-cho, Gokasyo-Sobosan; 27 Apr. 2003; F. Kodoi leg.; ELKU • 2 ♀♀; Miyakonojo- Hyuga, Nakao; 13 Apr. 1958; Y. Hirashima leg.; ELKU • 2 ♀♀; Makizono (Satsuma); 11 Apr. 1959; Y. Hirashima leg.; ELKU • 2 ♀♀; Kagoshima; 4 Apr. 1949; Y. Hirashima leg.; ELKU • 1 ♀; Sata (Osumi) Magome-Hetsuka; 24 May 1952; T. Esaki and Y. Hirashima leg.; ELKU • 1 ♀; Kagoshima Pref., Kiire-machi, Kiire; 31 Mar. 1975; O. Tadauchi leg.; ELKU • 1 ♀; Kagoshima Pref., Miyakonojo; 29 Mar. 1959; Y. Maeta leg.; ELKU. – Ryukyus • 1 ♀; Kagoshima Pref., Yaku-shima, Onoaida; 40 – 200 m a. s. l.; 27 Jul. 1982; S. Ikudome leg.; KWC. SOUTH KOREA – Jeollabuk-do • 1 ♀; Namweon-gun, Sannae-myon, Sanlyong-ri; 14 May 1991; O. Tadauchi leg.; ELKU. – Gyeongsangnam-do • 1 ♀; Hamyang-gun, Macheongmeon, Samjeong-ri; 12 May 1991; T. Saigusa leg.; ELKU.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB63FFDADCB64C8AFA23CC7A.taxon	description	Description Female MEASUREMENTS (n = 5, unit mm). BL = 5.00 – 5.63 (5.45 ± 0.27), WL = 4.63 – 5.00 (4.80 ± 0.14), HL = 1.55 – 1.65 (1.59 ± 0.04), HW = 1.61 – 1.74 (1.69 ± 0.05), IOD = 0.27 – 0.29 (0.28 ± 0.01), OOD = 0.26 – 0.29 (0.28 ± 0.01), OCD = 0.19 (0.19 ± 0.00), UOD = 1.00 – 1.06 (1.02 ± 0.03), MOD = 1.16 – 1.26 (1.21 ± 0.04), LOD = 0.87 – 0.94 (0.89 ± 0.03), IAD = 0.13 – 0.15 (0.14 ± 0.01), AOD = 0.29 – 0.31 (0.30 ± 0.01), CAL = 0.27 – 0.29 (0.29 ± 0.01), CPL = 0.32 – 0.34 (0.34 ± 0.01), EL = 1.85 – 1.90 (1.88 ± 0.03), EW = 0.42 – 0.48 (0.46 ± 0.03), GW = 0.29 – 0.32 (0.31 ± 0.02), SPL = 0.63 – 0.68 (0.65 ± 0.02), F 1 L = 0.08 – 0.10 (0.09 ± 0.01), F 2 L = 0.08 (0.08 ± 0.00), F 3 L = 0.08 (0.08 ± 0.00), F 2 W = 0.13 – 0.15 (0.14 ± 0.01), MsW = 1.85 – 2.10 (1.98 ± 0.09), SCL = 0.40 – 0.45 (0.42 ± 0.03), MNL = 0.23 – 0.25 (0.25 ± 0.01), MPL = 0.28 – 0.30 (0.28 ± 0.01), MtW = 1.95 – 2.15 (2.04 ± 0.07). COLORATION. Body black except for the following parts: mandible reddish brown apically; F 4 – F 10 yellowish brown (holotype and 18 paratypes) or brown (reamining paratypes) ventrally; tegula yellowish brown translucent; tibial spur yellow; metasomal terga broadly yellowish brown translucent apically. Wings transparent, veins and stigma brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: pronotal dorsum to lobe and metanotum moderately densely tomentose; hind trochanter, femur, and tibia mixed with plumose hairs, forming scopa. Disc of T 1 with sparse short hairs on medial area. Discs of T 2 – T 4 with moderately dense short hairs over entire surface. STRUCTURE AND SCULPTURE HEAD. Wider than long; HW: HL = 1: 0.94. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.84: 0.74. IOD: OOD: OCD = 1: 0.99: 0.69. IAD: AOD = 1: 2.11. Ocellocular area densely puctate, IS nearly smooth (IS = 0.5 – 2 d). Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area slightly convex, dimly shiny, with dense PP; IS distinctly tessellate (IS = 0.5 – 2 d). CPL: CAL = 1: 0.86. Clypeus nearly flat, with dense PP on upper half and larger shallow PP on lower half; IS nearly smooth over entire surface (IS = 0.5 – 1 d on upper half). EW: GW = 1: 0.68. Genal area to postgena with straight ridges. Malar space linear. Occiput not carinate. Hypostomal carinae nearly parallel. Mandible bidentate. Labrum (Fig. 13 C): basal area approximately 2 × as wide as long; distal process approximately 0.7 × as long as basal area, narrow, and without lateral projection; distal keel narrow, pointed apically. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 1.76; flagellum nearly flattened ventrally. THOIRAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum (Fig. 13 D) with dense PP over entire surface; IS distinctly tessellate nearly over entire surface (but weakly tessellate on posterior margin) (IS = 0.5 – 2 d); parapsidal line a narrow groove. Mesoscutellum with moderately dense PP over entire surface; IS weakly tessellate over entire surface (IS = 0.5 – 3 d in paratypes). Metanotum weakly rugulose. Mesepisternum with reticulate PP on upper area and weak rugulae on lower area. SCL: MNL: MPL = 1: 0.58: 0.67. Propodeum: metapostnotum (Fig. 13 E) weakly shiny and gently inclined, with straight ridges reaching to near posterior margin; junction between metapostnotum and posterior surface not carinate, weakly tessellate; lateral surface weakly rugulose and distinctly tessellate; posterior surface with lateral carina on lower half, without oblique carina. Coxae normal shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur with 3 – 4 slender teeth (n = 27). Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 with weak lineolation interrupted on medial area (Fig. 16 E), and with sparse fine PP on medial area; submedian patch distinct and nearly smooth. Disc of T 2 – T 3 with very weak lineolation on apical half, and without lineolation on basal half. T 4 very weakly lineolate over entire surface. Male Unknown.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB63FFDADCB64C8AFA23CC7A.taxon	distribution	Distribution Japan (Hokkaido, Honshu, Kyushu, northern Ryukyus), Korean Peninsula.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB63FFDADCB64C8AFA23CC7A.taxon	description	Flight period Female: late March to August. Flower records Brassica rapa L. var. oleifera DC. (Brassicaceae), Eleutherococcus sp. (Araliaceae), Erigeron annuus (L.) Pers. (Asteraceae), Ixeridium dentatum (Thunb.) Tzvelev subsp. dentatum (Asteraceae). Habitat This species has been collected mainly from mountainous areas in western Japan. One of the collecting sites in Japan is shown in Fig. 19 A.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB60FFDADC8F4FD4FA29C87C.taxon	description	Fig. 18 D	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB60FFDADC8F4FD4FA29C87C.taxon	diagnosis	Diagnosis Females are similar to L. (H.) taeniolellum. According to Murao (2012), this species is separated from L. (H.) taeniolellum by the postgena having distinct lineolation over entire surface, the distal process of labrum without lateral projection (Murao 2012: fig. 5), and T 1 with short hairs and fine PP on disc (Murao 2012: fig. 7). In contrast, in L. (H.) taeniolellum, the lineolation on postgena does not reach the apical margin, the distal process of labrum with horn-like lateral projection (Fig. 14 D), and T 1 nearly smooth. Male unknown.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB60FFDADC8F4FD4FA29C87C.taxon	distribution	Distribution Japan (central Ryukyus: Amami-Ohshima Is.).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB60FFDADC8F4FD4FA29C87C.taxon	description	Flight records Female: April to October. Flower records Two species in two families were reported as floral records by Murao (2012). Habitat This species has been collected from around subtropical forests in mountainous area (Murao 2012). It may prefer humid environments.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB60FFC1DCEA4BDDFCE8C9ED.taxon	description	Figs 2 B, 14, 16 F, 18 C, 20 I	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB60FFC1DCEA4BDDFCE8C9ED.taxon	diagnosis	Diagnosis Females are similar to L. (H.) tadauchii, but are separated from them by the lineolation on postgena not reaching the apical margin, the distal process of the labrum with a horn-like lateral projection (Fig. 14 D), and T 1 nearly smooth. In contrast, in L. (H.) tadauchii, the postgena have a distinct lineolation across the entire surface, the distal process of the labrum is without a lateral projection (Murao 2012: fig. 5), and T 1 has short hairs and fine PP on the disc (Murao 2012: fig. 7).	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB60FFC1DCEA4BDDFCE8C9ED.taxon	materials_examined	Material examined JAPAN – Hokkaido • 1 ♀; Ashoro-cho, Ashoro; 43 ° 20 ′ 0 ″ N, 143 ° 40 ′ 0 ″ E; 2 Jul. 2013; O. Tadauchi leg.; ELKU • 1 ♀; Nishiashoro (Tokachi); 8 Aug. 1955; Y. Hirashima leg.; ELKU • 1 ♀; Ashoro-gun, Metou; 19 Jun. 1957; M. Takahashi leg.; ELKU • 1 ♀; Sapporo, Hokkaido Univeristy Campus; 3 Sep. 1969; S. F. Sakagami leg.; MNHAH • 1 ♀; Ebetsubuto; 8 May 1974; M. Ishikawa leg.; MNHAH. – Honshu • 13 ♀♀; Iwate Pref., Morioka, Kuriyagawa; 16 May 1964; Y. Maeta leg.; ELKU • 4 ♀♀; same location as for preceding; 2 Jun. 1964; Y. Maeta leg.; ELKU • 1 ♀; Miyagi Pref., Sendai, Tsuchitoi; 10 May 1977; K. Gôukon leg.; MNHAH • 1 ♀; Ibaraki Pref., Tsukuba, Kouyadai; 22 Jun. 1989; T. Matsumura leg.; MNHAH • 1 ♀; Saitama Pref., Urawa; 24 Aug. 1968; T. Nambu leg.; ELKU • 3 ♀♀; Yamanashi Pref., Nakagawa; 9 Apr. 1962; T. Saigusa leg; commented by Dr Hirashima as “ compared with the type of Halictus taeniolellus Vachal ♀ ” the under label; ELKU • 1 ♀; Kyoto Pref., Expet. Internal. Forest, Kyoto Univ.; 10 Aug. 1985; T. Kakutani leg.; MNHAH. – Kyushu • 4 ♀♀; Fukuoka Pref., Fukuoka-shi, Higashi-ku, Hakozaki, Kyushu Univ.; 10 Jul. 2004; T. Sugimoto leg.; ELKU • 18 ♀♀; same location as for preceding; 18 Apr. 2006; R. Murao leg.; cMur • 1 ♀; same location as for preceding; 15 Jul. 2006; R. Murao leg.; cMur • 14 ♀♀, 5 ♂♂; same location as for preceding; 5 Jul. 2009; R. Murao leg.; cMur • 1 ♀; same location as for preceding; 29 Mar. 2012; R. Murao leg.; ELKU • 2 ♀♀; Kumamoto Pref., Aso-gun, Aso-machi; 20 Apr. 2001; A. Yamada and M. Nomura leg.; AETU • 1 ♀; same location as for preceding; 20 May 2001; A. Yamada leg.; AETU • 2 ♀♀; same location as for preceding; 28 May 2001; A. Yamada and M. Nomura leg.; AETU • 7 ♀♀; same location as for preceding; 7 Jun. 2001; A. Yamada and M. Nomrua leg.; AETU • 3 ♀♀; same location as for preceding; 16 Jun. 2001; A. Yamada and M. Nomura leg.; AETU • 1 ♀; same location as for preceding; 2 Jul. 2001; A. Yamada leg.; AETU • 1 ♀; same location as for preceding; 17 Sep. 2001; M. Nomura leg.; AETU • 2 ♀♀; same location as for preceding; 20 Oct. 2001; M. Nomura leg.; AETU • 1 ♀; same location as for preceding; 20 Nov. 2001; M. Nomura leg.; AETU • 3 ♀♀; Kumamoto Pref., Aso-gun, Choyo-son; 13 Jun. 2003; D. Kozai and M. Ishida leg.; AETU • 2 ♀♀; same location as for preceding; 21 Jun. 2003; M. Ishida leg.; AETU • 1 ♀; same location as for preceding; 26 Jun. 2003; M. Ishida leg.; AETU • 1 ♀; same location as for preceding; 2 Jul. 2003; M. Ishida leg.; AETU • 1 ♀; Kumamoto Pref., Aso-gun, Choyo-son, Setaura; 9 Jul. 1996; M. Yamada leg.; AETU • 1 ♀; Kumamoto Pref., Aso-gun, Ozu-machi ~ Choyo-son; 7 – 9 Oct. 2002; K. Mitai leg.; ELKU • 1 ♀; Kumamoto Pref., Kikuchi-gun, Ozu-machi; 2 Apr. 2002; T. Sugimoto leg.; AETU • 1 ♀; same location as for preceding; 25 Apr. 2002; Y. Terada leg.; AETU • 1 ♀; same location as for preceding; 21 Jul. 2002; Y. Terada leg.; AETU • 3 ♀♀; same location as for preceding; 18 Apr. 2003; M. Ishida leg.; AETU • 2 ♀♀; same location as for preceding; 28 Apr. 2003; M. Ishida and D. Kozai leg.; AETU • 1 ♀; same location as for preceding; 9 May 2003; M. Ishida leg.; AETU • 3 ♀♀; same location as for preceding; 20 May 2003; D. Kozai and M. Ishida leg.; AETU • 1 ♀; same location as for preceding; 29 May 2003; M. Ishida leg.; AETU • 3 ♀♀; same location as for preceding; 5 Jun. 2003; D. Kozai leg.; AETU • 6 ♀♀; same location as for preceding; 13 Jun. 2003; M. Ishida and D. Kozai leg.; AETU • 1 ♀; same location as for preceding; 21 Jun. 2003; D. Kozai leg.; AETU • 2 ♀♀; same location as for preceding; 5 Jul. 2003; M. Ishida leg.; AETU • 1 ♀; same location as for preceding; 26 Jul. 2003; M. Ishida leg.; AETU • 1 ♀; same location as for preceding; 13 Aug. 2003; M. Ishida leg.; AETU • 3 ♀♀; same location as for preceding; 22 Aug. 2003; M. Ishida and D. Kozai leg.; AETU • 1 ♀; same location as for preceding; 26 Sep. 2003; M. Ishida leg.; AETU • 1 ♀; same location as for preceding; 30 Oct. 2003; M. Ishida leg.; AETU • 2 ♀♀; Kumamoto Pref., Aso-gun, Nishihara-mura; 22 Apr. 2000; R. Murao leg.; AETU • 4 ♀♀; same location as for preceding; 29 Apr. 2000; R. Murao and M. Murase leg.; AETU • 1 ♀; same location as for preceding; 12 May 2000; M. Murase leg.; AETU • 2 ♀♀; same location as for preceding; 20 May 2000; R. Murao and M. Murase leg.; AETU • 4 ♀♀; same location as for preceding; 29 May 2000; R. Murao and M. Murase leg.; AETU • 1 ♀; same location as for preceding; 11 Jun. 2000; R. Murao leg.; AETU • 1 ♀; same location as for preceding; 14 Jun. 2000; M. Murase leg.; AETU • 1 ♀; same location as for preceding; 26 Jun. 2000; R. Murao leg.; AETU • 2 ♀♀; same location as for preceding; 14 Aug. 2000; R. Murao and M. Murase leg.; AETU • 1 ♀; same location as for preceding; 16 Aug. 2000; M. Murase leg.; AETU • 1 ♀; same location as for preceding; 28 Aug. 2000; M. Murase leg.; AETU • 1 ♀; same location as for preceding; 1 Oct. 2000; M. Murase leg.; AETU • 1 ♀; same location as for preceding; 6 Nov. 2000; M. Murase leg.; AETU • 2 ♀♀; same location as for preceding; 8 Dec. 2000; M. Murase leg., AETU • 8 ♀♀; Kumamoto Pref., Kikuchigun, Kikuyo-machi; 22 Apr. 2000; R. Murao and M. Murase leg.; AETU • 8 ♀♀; same location as for preceding; 29 Apr. 2000; R. Murao and M. Murase leg.; AETU • 6 ♀♀; same location as for preceding; 12 May 2000; R. Murao and M. Murase leg.; AETU • 7 ♀♀; same location as for preceding; 20 May 2000; R. Murao and M. Murase leg.; AETU • 15 ♀♀; same location as for preceding; 29 May 2000; R. Murao and M. Murase leg.; AETU • 2 ♀♀; same location as for preceding; 14 Jun. 2000; M. Murase leg.; AETU • 5 ♀♀; same location as for preceding; 26 Jun. 2000; R. Murao and M. Murase leg.; AETU • 1 ♀; same location as for preceding; 6 Jul. 2000; M. Murase leg.; AETU • 1 ♀; same location as for preceding; 16 Aug. 2000; M. Murase leg.; AETU • 1 ♀; same location as for preceding; 28 Aug. 2000; R. Murao leg.; AETU • 1 ♀; same location as for preceding; 8 Sep. 2000; M. Murase leg.; AETU • 2 ♀♀; same location as for preceding; 19 Sep. 2000; M. Murase leg.; AETU • 5 ♀♀; same location as for preceding; 10 Oct. 2000; R. Murao and M. Murase leg.; AETU • 9 ♀♀; same location as for preceding; 19 Oct. 2000; R. Murao and M. Murase leg.; AETU • 5 ♀♀; same location as for preceding; 27 Oct. 2000; R. Murao and M. Murase leg.; AETU • 1 ♀; same location as for preceding; 6 Nov. 2000; M. Murase leg.; AETU.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB60FFC1DCEA4BDDFCE8C9ED.taxon	description	Redescription Female MEASUREMENTS (n = 5, unit mm). BL = 5.38 – 5.50 (5.35 ± 0.21), WL = 4.38 – 4.88 (4.55 ± 0.21), HL = 1.42 – 1.48 (1.45 ± 0.02), HW = 1.55 – 1.61 (1.57 ± 0.03), IOD = 0.29 – 0.32 (0.30 ± 0.01), OOD = 0.24 – 0.29 (0.26 ± 0.02), OCD = 0.18 – 0.21 (0.19 ± 0.01), UOD = 0.97 – 1.00 (0.97 ± 0.01), MOD = 1.13 – 1.16 (1.15 ± 0.02), LOD = 0.84 – 0.90 (0.87 ± 0.02), IAD = 0.15 – 0.16 (0.15 ± 0.01), AOD = 0.29 – 0.31 (0.30 ± 0.01), CAL = 0.26 – 0.27 (0.26 ± 0.01), CPL = 0.29 – 0.32 (0.31 ± 0.02), EL = 1.70 – 1.75 (1.72 ± 0.03), EW = 0.39 – 0.45 (0.42 ± 0.03), GW = 0.23 – 0.35 (0.30 ± 0.05), SPL = 0.61 – 0.65 (0.63 ± 0.01), F 1 L = 0.08 – 0.10 (0.09 ± 0.01), F 2 L = 0.08 (0.08 ± 0.00), F 3 L = 0.08 (0.08 ± 0.00), F 2 W = 0.11 – 0.13 (0.13 ± 0.01), MsW = 1.80 – 1.85 (1.83 ± 0.03), SCL = 0.38 – 0.40 (0.40 ± 0.01), MNL = 0.20 – 0.23 (0.22 ± 0.01), MPL = 0.25 – 0.30 (0.28 ± 0.02), MtW = 1.85 – 2.05 (1.90 ± 0.09). COLORATION. Body black except for the following parts: mandible reddish brown apically; all flagellar segments brown or F 5 – F 10 yellowish brown ventrally; tegula yellowish brown translucent; tibial spur yellow; metasomal terga broadly yellowish brown translucent apically. Wings transparent, veins and stigma yellowish brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: pronotal dorsum to lobe and metanotum moderately densely tomentose; posterior surface of propodeum sparsely tomentose; hind trochanter, femur, and tibia mixed with plumose hairs, forming scopa. Disc of T 1 without short hairs on medial area. Discs of T 2 – T 4 with moderately dense short hairs over entire surface. STRUCTURE AND SCULPTURE HEAD. Wider than long; HW: HL = 1: 0.92. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.85: 0.76. IOD: OOD: OCD = 1: 0.87: 0.65. IAD: AOD = 1: 1.96. Ocellocular area densely puctate, IS nearly smooth (IS = 0.5 – 2 d). Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area slightly convex, dimly shiny, with dense PP; IS distinctly tessellate (IS = 0.5 – 1.5 d). CPL: CAL = 1: 0.85. Clypeus nearly flat, with reticulate PP nearly over entire surface, its PP gradually sparser toward lower area; IS nearly smooth on lower area (IS = 0.5 – 2 d on lower area). EW: GW = 1: 0.71. Genal area with weak straight ridges. Malar space linear. Occiput not carinate. Hypostomal carinae nearly parallel. Postgena weakly tessellate, sometimes nearly smooth in part. Mandible bidentate. Labrum (Fig. 14 D): basal area approximately 2.1 × as wide as long; distal process approximately 0.7 × as long as basal area, narrow, and with horn-like lateral projection; distal keel narrow, pointed apically. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 1.56; flagellum nearly flattened ventrally. THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum (Fig. 14 E) with dense PP over entire surface; IS distinctly tessellate over entire surface (IS = 0.5 – 2 d); parapsidal line a narrow groove. Mesoscutellum with sparse PP on submedian area and denser PP on marginal area; IS nearly smooth over entire surface (IS = 1 – 3 d on submedian area, and 0.5 – 1 d on marginal area). Metanotum weakly rugulose. Mesepisternum with reticulate PP over entire surface. SCL: MNL: MPL = 1: 0.56: 0.71. Propodeum: metapostnotum (Fig. 14 F) weakly shiny and gently inclined, with short straight ridges occupying only anterior half, with weak tessellation on posterior half; junction between metapostnotum and posterior surface not carinate, weakly tessellate; lateral surface weakly rugulose and distinctly tessellate; posterior surface with lateral carina on lower half, without oblique carina. Coxae normal shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg carinate marginally. Inner hind tibial spur with 2 – 5 slender teeth as in Fig. 20 I (n = 13). Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 nearly smooth over entire surface (Fig. 16 F). Disc of T 2 very weakly lineolate in part (only anterior or both anterior and posterior area). T 3 – T 4 very weakly lineolate over entire surface. First description of male MEASUREMENTS (n = 5, unit mm). BL = 3.92 – 5.23 (4.68 ± 0.56), WL = 3.23 – 4.00 (3.71 ± 0.27), HL = 1.18 – 1.44 (1.32 ± 0.10), HW = 1.27 – 1.51 (1.41 ± 0.09), IOD = 0.22 – 0.31 (0.28 ± 0.03), OOD = 0.24 – 0.27 (0.25 ± 0.01), OCD = 0.18 – 0.22 (0.20 ± 0.02), UOD = 0.84 – 0.98 (0.92 ± 0.05), MOD = 0.89 – 1.07 (1.00 ± 0.06), LOD = 0.60 – 0.76 (0.70 ± 0.06), IAD = 0.18 – 0.22 (0.20 ± 0.02), AOD = 0.18 – 0.22 (0.20 ± 0.02), CAL = 0.20 – 0.27 (0.24 ± 0.02), CPL = 0.29 – 0.31 (0.30 ± 0.01), EL = 0.87 – 1.09 (0.98 ± 0.07), EW = 0.40 – 0.47 (0.43 ± 0.03), GW = 0.27 – 0.33 (0.29 ± 0.03), SPL = 0.31 – 0.38 (0.35 ± 0.03), F 1 L = 0.09 – 0.11 (0.11 ± 0.01), F 2 L = 0.18 – 0.22 (0.21 ± 0.02), F 3 L = 0.18 – 0.24 (0.22 ± 0.02), F 2 W = 0.11 – 0.13 (0.12 ± 0.01), MsW = 1.19 – 1.48 (1.34 ± 0.10), SCL = 0.29 – 0.38 (0.33 ± 0.03), MNL = 0.13 – 0.18 (0.16 ± 0.02), MPL = 0.22 – 0.24 (0.23 ± 0.01), MtW = 1.03 – 1.29 (1.19 ± 0.02). COLORATION. Body black except for the following parts: lower half of clypeus yellow; mandible except for apically and labrum yellow; mandible apically reddish; all flagellar segments yellowish brown ventrally; pronotal lobe yellow or yellowish brown; tegula yellow translucent; tibiae basally and apically yellow; tibial spur yellow; tarsi yellow; metasomal terga broadly yellowish brown translucent apically. Wings transparent, veins and stigma yellowish brown. PUBESCENCE. Body hairs whitish, and covered with erect and sparse straight or fine branched hairs except for the following parts: lower paraocular area, supraclypeal area, pronotal dorsum to lobe and metanotum thinly tomentose. Metasomal terga with sparse, simple and short hairs over entire surface. STRUCTURE AND SCULPTURE HEAD. Wider than long; HW: HL = 1: 0.93. Vertex rounded in frontal view. MOD: UOD: LOD = 1: 0.92: 0.70. IOD: OOD: OCD = 1: 0.90: 0.71. IAD: AOD = 1: 1.00. Ocellocular area with reticulate PP. Paraocular area and frons weakly shiny, with shallow reticulate PP. Supraclypeal area nearly flat, weakly shiny, with moderately dense PP over entire surface; IS nearly smooth (IS = 0.5 – 3 d). Clypeus weakly shiny, with dense PP over entire surface; IS nearly smooth (IS = 0.5 – 1 d). CPL: CAL = 1: 0.78. EW: GW = 1: 0.68. Genal area with weak straight ridges. Malar space linear. Occiput not carinate. Hypostomal carinae nearly parallel. Postgena longitudinal lineolate. Mandible edentate. Antenna short, not reaching metasoma. F 2 L: F 2 W = 1: 0.58; flagellum nearly flattened ventrally. THORAX. Dorsolateral angle of pronotum obtuse; lateral surface without ridges; lateral lobe rounded. Tegula ovoid, nearly smooth. Mesoscutum with dense PP over entire surface; IS smooth except for anteriorly weakly tessellate (IS = 0.5 – 2 d); parapsidal line a narrow groove. Mesoscutellum with sparse PP over entire surface; IS smooth (IS = 1 – 5 d). Metanotum weakly rugulose. Mesepisternum with moderately dense PP over entire surface; IS smooth (IS = 1 – 3 d). SCL: MNL: MPL = 1: 0.49: 0.68. Propodeum: metapostnotum shiny and gently inclined, with short straight ridges occupying only anterior half, weakly tessellate or nearly smooth on posterior half; junction between metapostnotum and posterior surface not carinate, weakly tessellate or nearly smooth; lateral surface weakly rugulose and distinctly tessellate; posterior surface with lateral carina on lower half, without oblique carina. Coxae normal shape, without tubercle. Fore trochanter narrow, longer than wide. Basitibial plate of hind leg weakly carinate marginally. Inner hind tibial spur without tooth. Fore wing with three submarginal cells. ABDOMEN. Disc of T 1 without distinct PP and tessellation. Disc of T 2 – T 4 with sparse fine PP, T 2 without lineolation, T 3 with weak lineolation on apical half, and T 4 with weak lineolate over entire surface. S 7 with moderately long, apically truncate or rounded median process. GENITALIA. Gonobase flat at bottom; gonocoxite smooth; ventral retrorse lobe tongue-like, moderately long but not reaching gonobase, with sparse short hairs ventrally.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB60FFC1DCEA4BDDFCE8C9ED.taxon	distribution	Distribution Japan (Hokkaido, Honshu, Izu-shotô Islands, Shikoku, Kyushu, Tsu-shima Is., northern Ryukyus), Korean Peninsula.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB60FFC1DCEA4BDDFCE8C9ED.taxon	description	Flight period Female: April to December. Males have been collected from August to September in the Korean Peninsula (Ebmer 1978 b). In Japan, males have been collected at one site (Hakozaki Campus, Kyushu University, Japan, Fig. 19 C) from June to July. Flower records The specimens examined in this paper were collected on the flowers of 46 species in 23 families as follows. Amaranthaceae: Achyranthes bidentata Blume var. japonica Miq.; Amaranthus blitum L. Anacardiaceae: Toxicodendron trichocarpum (Miq.) Kuntze. Asteraceae: Artemisia indica Willd. var. maximowiczii (Nakai) H. Hara; Aster microcephalus (Miq.) Franch. & Sav. var. ovatus (Franch. & Sav.) Soejima & Mot. Ito; Erigeron annuus (L.) Pers.; Erigeron philadelphicus L.; Euchiton japonicus (Thunb.) Anderb.; Lapsanastrum humile (Thunb.) Pak & K. Bremer; Picris hieracioides L. subsp. japonica (Thunb.) Krylov; Solidago altissima L.; Sonchus asper (L.) Hill; Taraxacum sp.; Youngia japonica (L.) DC. Brassicaceae: Brassica rapa L. var. oleifera DC.; Capsella bursa-pastoris (L.) Medik.; Rorippa indica (L.) Hiern. Campanulaceae: Lobelia chinensis Lour. Caryophyllaceae: Silene armeria L.; Stellaria aquatica (L.) Scop. Commelinaceae: Commelina communis L. Cucurbitaceae: Momordica charantia L. Elatinaceae: Stellaria sp. Ericaceae: Rhododendron sp. Fabaceae: Astragalus sinicus L.; Trifolium dubium Sibth.; Trifolium repens L.; Vicia hirsuta (L.) Gray; Vicia sativa L. subsp. nigra (L.) Ehrh. Geraniaceae: Geranium carolinianum L. Lamiaceae: Lamium album L. var. barbatum (Siebold & Zucc.) Franch. & Sav.; Lamium amplexicaule L.; Vitex negundo L. var. cannabifolia (Siebold & Zucc.) Hand. - Mazz. Mazaceae: Mazus pumilus (Burm. f.) Steenis. Oxalidaceae: Oxalis corniculata L. Papaveraceae: Corydalis incisa (Thunb.) Pers. Plantaginaceae: Veronica persica Poir. Polygonaceae: Persicaria longiseta (Bruijn) Kitag.; Persicaria sagittata (L.) H. Gross var. sibirica (Meisn.) Miyabe. Portulacaceae: Portulaca oleracea L. Ranunculaceae: Ranunculus cantoniensis DC.; Ranunculus sceleratus L. Rosaceae: Kerria japonica (L.) DC. f. albescens (Makino ex Koidz.) Ohwi; Pourthiaea villosa (Thunb.) Decne. var. villosa. Rubiaceae: Paederia foetida L. Solanaceae: Solanum nigrum L. Habitat This species has been collected mainly in cultivated or urban lowland areas and semi-natural grassland in Kyushu, western Japan. One of the collection sites in Japan is shown in Fig. 19 C.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB76FFCCDF074C56FB5ECD7E.taxon	materials_examined	Material examined JAPAN – Kyushu • 2 ♀; Fukuoka Pref., Soeda-machi, Kyushu Univ., Hikosan Exp. St.; 33 ° 28 ′ 48.746 ″ N, 130 ° 54 ′ 55.452 ″ E; 13 Jun. 2013; R. Murao leg.; ELKU • 2 ♂♂; Kumamoto Pref., Aso-shi, Aso-machi, Matoishi wilderness; 37 ° 27 ′ 15 ″ N, 128 ° 1 ′ 10 ″ E; 5 Aug. 2013; R. Murao leg.; ELKU.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB76FFCCDF074C56FB5ECD7E.taxon	discussion	Comments This unknown species has been identified as Lasioglossum (Hemihalictus) sexstrigatus (Schenck, 1869) in Japan. According to DNA analysis in the present study, the pair-wise sequence divergence between Japanese and European specimens was quite clear (7.3 – 7.9 % between L. sexstrigatus and L. sp. in Table 1). Morphologically, females of this species are slightly different from L. (H.) sexstrigatus as the mesoscutum has a weak tessellation over the entire surface (in contrast, in L. (H.) sexstrigatus, the mesoscutum is nearly smooth on the posterior half). In the present study, I could not conclude that this unknown species is either undescribed or a known species, but this will be examined in further studies.	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB75FFCEDDE94E06FD08C9EC.taxon	discussion	Females	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
941087F1CB75FFCEDDE94E06FD08C9EC.taxon	discussion	Males	en	Murao, Ryuki (2021): Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species. European Journal of Taxonomy 763: 1-74, DOI: 10.5852/ejt.2021.763.1463, URL: http://dx.doi.org/10.5852/ejt.2021.763.1463
