Redefinition of the sexstrigatus group of Lasioglossum (Hemihalictus) Cockerell, 1897 (Hymenoptera, Apoidea, Halictidae), with a revision of Japanese species Author Murao, Ryuki 7E665839-6675-4365-A7EA-169D4E4DA008 Regional Environmental Planning Co., Ltd, 1 - 10 - 12, Muromi, Sawara-ku, Fukuoka, 814 – 0015 Japan. r.murao@mbr.nifty.com text European Journal of Taxonomy 2021 2021-08-18 763 1 74 http://dx.doi.org/10.5852/ejt.2021.763.1463 journal article 4854 10.5852/ejt.2021.763.1463 31f73be9-4a90-4c0a-937e-784437eff4bd 2118-9773 5235968 9823AAD7-1113-434B-9882-1CF885DE7CED Lasioglossum ( Hemihalictus ) kiautschouense ( Strand, 1910 ) Figs 6 , 15C , 17B , 19A , 20C Halictus kiautschouense Strand, 1910: 195 ( holotype : ZMHB, ♀ , type locality =Kiautshou, Tsingtou, China , examined). Halictus kiautschauensis Blüthgen, 1922: 54 (unjustified emendation of Halictus kiautschouense Strand, 1910 , comment by Pesenko 2007b: 111 ). Halictus perplexans Cockerell, 1925: 10 ( syntype : ♀ , ZMHB, type locality =Preobragenya Bay, Russia , examined; 4 ♀♀ , USNM, type locality= Preobragenya Bay and Low Lighthouse, Russia ). Syn. nov. Lasioglossum ( Evylaeus ) kiautschouense – Ebmer 1978a: 212 ; 1996: 292; 2006: 572. Lasioglossum ( Evylaeus ) perplexans – Ebmer 1996: 293 ; 2006: 571 . Evylaeus ( Prosopalictus ) kiautschouensis – Pesenko 2007b: 111 . Evylaeus ( Prosopalictus ) perplexans – Pesenko 2007b: 111 . Lasioglossum ( Hemihalictus ) kiautschouense – Murao 2017a: 460–461 . 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 T1 with distinct sparse fine PP ( Fig. 15C ) and without lineolation ( Murao 2017a ). 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 . 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), F1L=0.08– 0.10 (0.09 ±0.01), F2L=0.08 (0.08 ± 0.00), F3L=0.08 (0.08 ± 0.00), F2W= 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; F4–F10 or F5–F10 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. 6C ): 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. F2L:F2W=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. 6D ) 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. 6E ) 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 Fig. 6. Lasioglossum ( Hemihalictus ) kiautschouense ( Strand, 1910 ) , ♀. A . Lateral habitus. B . Head in frontal view. C . Labrum. D . Mesoscutum. E . Metapostnotum. Scale bars: A = 3 mm; B, D–E = 0.5 mm; C = 0.25 mm. plate of hind leg carinate marginally. Inner hind tibial spur with slender 2–4 teeth as in Fig. 20C (n =17). Fore wing with three submarginal cells. ABDOMEN. Disc of T1 with sparse distinct fine PP on medial area and without lineolation over entire surface ( Fig. 15C ). Discs of T2–T4 without lineolation over entire surface (sometimes T4 with very weak lineolation). Male Not examined in the present study. Distribution Japan ( Hokkaido , Honshu, Kyushu, Izu-shotô Islands), Korean Peninsula, Russian Far East, China . 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. 19A . 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 .