Lasioglossum (Hemihalictus) sakagamii Ebmer, 1978

Figs 7A, 11A

Lasioglossum (Evylaeus) sakagamii Ebmer 1978a: 207, Fig. 12 (♀ ♂) [Holotype: Alexander Koenig Museum, Bonn, Germany, ♀, type locality = Mandschurei, Harbin, Heilongjiang Prov., China]; Sakagami et al. 1982: 207.

Evylaeus (Microhalictus) sakagamii: Pesenko 2007b: 84 (in key), 93 (in key), Figs 80–82 (♂).

Diagnosis. This species is similar to L. amurense (Vachal) from eastern Asia and L. quadrinotatulum (Schenck) from Europe to eastern Asia. It is separated from these species by a combination of following character states: female mesoscutum with sparser PP (IS = 6 d in maximum); male F3 length/width ratio 1.2; male S2–S3 normal; gonocoxite of male genitalia not densely haired; and gonostylus of male genitalia basally narrow and apically expanded, and without basomedial projection. In contrast, in L. amurense, female mesoscutum with denser PP (IS = 3 d in maximum), male F3 length/width ratio 1.6, the male S2–S3 tuberculate, gonocoxite of male genitalia densely haired, and gonostylus of male genitalia slender and parallel-sided, and with basomedial projection; in L. quadrinotatulum, female mesoscutum with denser PP (IS = 4 d in maximum), male F3 length/width ratio 1.5, male S2–S3 normal, gonocoxite of male genitalia not densely haired, and shape of gonostylus of male genitalia similar to L. sakagamii, but with basomedial projection (Sakagami et al. 1982).

Specimens examined. (n = 5) [South Korea] GW: 2♀, Bougmyong-ri, Dongsan-myon, Chunchon-gun, 23. v. 1992 (O. Tadauchi, ELKU) ; 2♀, Gamjong-ri, Dong-myon, Chunchon-gun, 25. iv. 1992 (O. Tadauchi, ELKU). GG: 1♀, Kwangung, 2. viii. 1998 (Y. Maeta, SULE).

Distribution. North Korea, South Korea (new record), Mongolia, Russian Far East, China, Japan.

Flight period in South Korea. Female: April to August. Males have not been recorded from South Korea. In Japan, males are collected from July to October (Murao 2014).

Flower records in South Korea. Aster sp. ( Asteraceae), Crataegus sp. ( Brassicaceae), Capsella sp. ( Brassicaceae).