Dialictus Robertson, 1902

Murao, Ryuki, 2017, Bees of the Hemihalictus series of Lasioglossum Curtis (Hymenoptera, Halictidae) in South Korea, Zootaxa 4268 (4), pp. 451-488 : 455-456

Subgenus Dialictus Robertson, 1902

Paralictus Robertson 1901: 229 . Type species: Halictus cephalictus Robertson, 1892 , by original designation. Opinion 1882 (ICZN 1997)

Dialictus Robertson 1902a: 48 . Type species: Halictus anomalus Robertson, 1892 , by original designation and monotypy. Chloralictus Robertson 1902b: 248 . Type species: Halictus cressonii Robertson, 1890 , by original designation.

Halictus (Gastrolictus) Ducke 1902: 102 . Type species: Halictus osmioides Ducke, 1902 , by monotypy.

Halictomorpha Schrottky 1911: 81 . Type species: Halictomorpha phaedra Schrottky, 1911 , by original designation. Rhynchalictus Moure 1947: 5 . Type species: Rhynchalictus rostratus Moure, 1947 , by original designation.

Halictus (Smeathhalictus) Warncke 1975: 88 . Type species: Melitta smeathmanella Kirby, 1802 , by original designation. Evylaeus (Viridihalictus) Pesenko 2007a: 26 . Type species: Halictus viridis Brullé, 1840 , by original designation. Evylaeus (Glauchalictus) Pesenko 2007a: 26 . Type species: Halictus problematicus Blüthgen, 1923 , by original designation. Evylaeus (Virenshalictus) Pesenko 2007a: 26 . Type species: Halictus virens Erichson, 1835 , by original designation. Evylaeus (Loethalictus) Pesenko 2007a: 26 . Type species: Halictus loetus Brullé, 1840 , by original designation.

Evylaeus (Aerathalictus) Pesenko 2007a: 27 . Type species: Melitta aerata Kirby, 1802 , by original designation.

Diagnosis. This subgenus is separated from other subgenera in the Hemihalictus series occurring in eastern Asia by a combination of head and mesosoma with brilliant or dull green-metallic luster ( Figs 1 C, 2A) and mesepisternum with shallow PP ( Fig. 2 D) or reticulate PP. In eastern Asia, the apristum group belonging to L. ( Sphecodogastra ) has green-metallic luster on head and mesosoma in female. But, the members of this group can be separated from L. ( Dialictus ) in having the mesepisternum coarse reticulate-rugulose ( Fig. 2 C), the posterior surface of propodeum with complete lateral carina such as Fig. 3 B, and the inner hind tibial spur with fine serration ( Murao et al. 2015a). Comments. Palearctic species is classified into 6 species groups as defined by Pesenko (2007a): aeratum group ( Ebmer 1976b), atroglaucum group ( Ebmer 2002), loetum group, smeathmanellum group, viride group ( Ebmer 1993), and virens group (treated in Pesenko 2007a, as Evylaeus (Aerathalictus) , E. (Glauchalictus), E. (Loethalictus), E. (Smeathhalictus), E. (Viridihalictus), and E. (Virenshalictus, respectively). Three groups of them occur in the Korean Peninsula: aeratum, atroglaucum and smeathmanellum.

Figures

FIGURE 1. A: fore wing of female. B – E: lateral habitus of four subgenera of Lasioglossum occurring in South Korea. A – B: L. (Acanthalictus) dybowskii (Radoszkowski). C: L. (Dialictus) miyabei Murao, Ebmer & Tadauchi. D: L. (Hemihalictus) transpositum (Cockerell). E: L. (Sphecodogastra) apristum (Vachal). A – E: ♀.

FIGURE 2. A, B: body color of head and mesosoma. C, D, F: mesepisternum. E: pronotum in lateral view. A: Lasioglossum ellipticeps (Blüthgen). B: L. calceatum (Scopoli). C: L. apristum (Vachal). D: L. miyabei Murao, Ebmer & Tadauchi. E, F: L. percrassiceps (Cockerell). A – F: ♀.

FIGURE 3. A: pronotum in lateral view. B, C: posterior surface of propodeum. D, E: posterior area of mesoscutum. A: Lasioglossum apristum (Vachal). B: L. affine (Smith). C: L. transpositum (Cockerell). D: L. sibiriacum (Blüthgen). E: L. hoffmanni (Strand). A – E: ♀.