Lasioglossum (Hemihalictus) transpositum (Cockerell, 1925)

Figs 1 D, 3C, 6D, 6F, 7F, 8C, 9B

Halictus transpositus Cockerell 1925: 8 [Holotype: U.S. National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA; ♀, type locality = Kongaus (now, Anisimovka, Primorsk Terr.), Russia, examined]. Halictus tutihensis Cockerell 1925: 8 [Holotype: U.S. National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA; ♀, type locality = Tutihe (Primorsk Terr.), Russia].

Evylaeus (Microhalictus) transpositus: Pesenko 2007b: 84 (in key), 93 (in key), 109, Figs 83–85 (♂). Lasioglossum (Evylaeus) transpositum: Ebmer 1996: 286; Ebmer 2002: 879; Murao & Tadauchi 2008b: 96, Figs 1–2, 5A, (♀ ♂).

Diagnosis. This species is similar to L. metis from eastern Asia. It is separated from L. metis by the following character states: female supraclypeus with denser PP (IS = 1.5 d in maximum); female labrum without lateral projection on distal process (Murao & Tadauchi 2008b, Fig. 1 H); female postgena nearly smooth, mesepisternum punctate on upper area in both sexes; and male S2–S5 lateroapically with thin hair tufts (Murao & Tadauchi 2008b, Fig. 2 F). In contrast, L. metis has female supraclypeus with sparser PP (IS = 3 d in maximum), female labrum with small lateral projection on distal process (Murao & Tadauchi 2008b, Fig. 3 G), female postgena with distinct lineolation, mesepisternum nearly smooth on upper area in both sexes, and male metasomal sterna with uniform and sparse hairs.

Specimens examined. (n = 102) [South Korea] GW: 16♀, Bougmyong-ri, Dongsan-myon, Chunchon-gun, 22–23. v. 1992 (O. Tadauchi, ELKU) ; 1♀, Chungchong, 17. v. 1984 (K. Morimoto, ELKU) ; Gamjong-ri, Dongmyon, Chunchon-gun, 3♀, 25. iv. 1992 (T. Saigusa & O. Tadauchi, ELKU) , 5♀, 21. v. 1992 (O. Tadauchi, ELKU); 5♀, Ogari, Seon-myon, Yangyang-gun, 27. iv. 1992 (O. Tadauchi, ELKU) ; 6♀, Pupan-myon, Hongcheon-gun, 20. v. 1992 (O. Tadauchi, ELKU) . GG: Kwangnung, Pochon-gun, 4♀, 19. v. 1992 (O. Tadauchi, ELKU) , 1♀, 16. vii. 1992 (K. Kanmiya, ELKU). Seoul: 1♀, 17. v. 1984 (K. Morimoto, ELKU) . JB: Sanlyong-ri, Sannae-myon, Namweon-gun, 2♀, 12. v. 1991 (O. Tadauchi, ELKU) , 6♀, 2. v. 1992 (T. Saigusa & O. Tadauchi, ELKU). GN: Samjeon-ri, Macheong-myon, Hamyang-gun, 1♀, 11. v. 1991 (O. Tadauchi, ELKU) , 1♀, 12. v. 1991 (T. Saigusa, ELKU), 3♀, 1. iv. 1992 (O. Tadauchi, ELKU), 1♀, Wahyeon-ri, Irun-myon, Geoje-si, 14. v. 2011 (O. Tadauchi, ELKU) . JJ: 26♀, High resting area, Mt. Halla-san, alt. 1100 m, 26. iv. 1997 (O. Tadauchi & J.C. Paik, ELKU) ; 5♀, Mt. Halla-san, alt. 300–550 m, 26. iv. 1997 (O. Tadauchi & J.C. Paik, ELKU) ; 1♀, Mt. Halla-san, alt. 1500–1600 m, 25. vii. 1990 (O. Tadauchi, ELKU) ; 1♀, Ora-dong, Jeju-si, 4. iv. 1998 (O. Tadauchi, ELKU) ; Yonsil, Mt. Hallasan, 1♀ 10♂, 24. vii. 1990 (O. Tadauchi, ELKU) , 2♀, 27. vii. 1990 (O. Tadauchi, ELKU).

Distribution. South Korea, Russian Far East, China, Japan.

Flight period in South Korea. Female: April to July. Male: July.

Flower records in South Korea. Taraxacum spp. ( Asteraceae), Forsythia suspensa (Oleaceae) .