Lasioglossum (Hemihalictus) Cockerell, 1897

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, pp. 1-74 : 6-7

Lasioglossum (Hemihalictus) Cockerell, 1897

Hemihalictus Cockerell, 1897: 288 (also published as new by Cockerell 1898) (type species: Panurgus lustrans Cockerell, 1897 , by original designation).

Sudila Cameron, 1898: 52 (type species: Sudila bidentata Cameron, 1898 , by designation of Sandhouse 1943).

Prosopalictus Strand, 1913: 26 (type species: Prosopalictus micans Strand, 1913 , by original designation and monotypy).

Ceylonicola Friese, 1918: 501 (type species: Ceylonicola atra Friese, 1918 = Sudila bidentata Cameron, 1898 , by designation of Sandhouse 1943).

Halictus (Microhalictus) Warncke, 1975: 85 (type species: Melitta minutissima Kirby, 1802 , by original designation).

Halictus (Puncthalictus) Warncke, 1975: 87 (type species: Hylaeus punctatissimus Schenck, 1853 , by original designation).

Halictus (Rostrohalictus) Warncke, 1975: 88 (type species: Halictus longirostris Morawitz, 1876 , by original designation and monotypy).

Halictus (Marghalictus) Warncke, 1975: 95 (type species: Hylaeus marginellus Schenck, 1853 , by original designation).

Lasioglossum (Sellalictus) Pauly, 1980: 120 (type species: Halictus latesellatus Cockerell, 1937 , by original designation).

Halictus (Pauphalictus) Warncke, 1981: 87 (type species: Halictus pauperatus Brullé, 1832 , by original designation).

Lasioglossum (Mediocralictus) Pauly, 1984: 143 (type species: Halictus mediocris Benoist, 1962 , by original designation).

Evylaeus (Limbevylaeus) Pesenko, 2007a: 20 (type species: Halictus limbellus Morawitz, 1876 , by original designation).

Evylaeus (Crassevylaeus) Pesenko, 2007a: 20 (type species: Halictus crassepunctatus Blüthgen, 1923 , by original designation and monotypy).

Evylaeus (Laevinodilaeus) Pesenko, 2007a: 20 (type species: Halictus laevinodis Morawitz, 1876 , by original designation and monotype).

Evylaeus (Pallidevylaeus) Pesenko, 2007a: 23 (type species: Nomioides pallida Radoszkowski, 1888 , by original designation and monotypy).

Evylaeus (Nitidiusculaeus) Pesenko, 2007a: 24 (type species: Melitta nitidiuscula Kirby, 1802 , by original designation).

Evylaeus (Truncevylaeus) Pesenko, 2007a: 24 (type species: Halictus truncaticollis Morawitz, 1877 , by original designation).

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:

1. Lower margin of male clypeus deflected forward; female labrum without basal elevation; basal elevation of male labrum stongly swollen, with longitudinal furrow; female mandible with two preapical teeth; male S2 gently swollen on apical part; male S6 expanded apically ( Murao et al. 2014: figs 5–8, 15, 20) ........................................................................ Acanthalictus Cockerell, 1924

– Male clypeus normal, not deflected; female labrum with basal elevation (as in Fig. 4D ); male labrum without basal elevation or with low basal elevation; female mandible with a preapical tooth; male S2 flat; male S6 straight apically ............................................................................................................ 2

2. Head and mesosoma with brilliant or dull green-metallic luster in both sexes (mesepisternum with shallow PP or reticulate PP in both sexes, see Murao et al. 2015b: figs 1e, 6e, 20e).......................... ................................................................................................................... Dialictus Robertson, 1902

– Body generally black ......................................................................................................................... 3

3. Posterior surface of propodeum generally with complete lateral carina ( Murao 2017a: fig. 3b); mesepisternum with coarse reticulate-rugulae over entire surface ( Murao 2017a: fig. 2c)................. ......................................................................................................... Sphecodogastra Ashmead, 1899

– Posterior surface of propodeum with incomplete lateral carina not reaching metapostnotum ( Murao 2017a: fig. 3c); mesepisternum with shallow or reticulate PP ( Fig. 2E ; Murao 2017b: fig. 1d) ......... ............................................................................................................. Hemihalictus Cockerell, 1897

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.

Figures

Fig. 4. Lasioglossum (Hemihalictus) frigidum Sakagami & Ebmer, 1996. A. ♀, lateral habitus. B. ♀, head in frontal view. C. ♂, head in frontal view. D. ♀, labrum. E. ♀, mesoscutum. F. ♀, metapostnotum. Scale bars: A = 2 mm; B, E–F = 0.5 mm; C–D = 0.2 mm.

Fig. 2. A, E. Lasioglossum (Hemihalictus) sexstrigatus (Schenck, 1869). A. ♂, lateral habitus. E. ♀, mesepisternum. — B. L. (H.) taeniolellum (Vachal, 1903), ♂, labrum. — C, F. L. (H.) frigidum Sakagami & Ebmer, 1996. C. ♂, cephalic polymorphism. F. ♀, metasomal terga. — D. L. (H.) simplicior (Cockerell, 1931), ♂, cephalic polymorphism. Scale bars: A = 2 mm; B = 0.2 mm; C, E = 0.5 mm; D, F = 1 mm.