Lasioglossum (Sphecodogastra) apristum (Vachal, 1903)

Figs 1 E, 2C, 3A, 8F, 10A

Halictus apristus Vachal 1903: 130 [Holotype: Muséum National d’ Histoire Naturelle, Paris, France; ♀, type locality = Nikkon Moyen, env. De Tokio et Alpes de Nikko (on label), Japan] . Lectotype designation by Ebmer (1978b: 313) is unnecessary (Pesenko 2007b: 101).

Sphecodes pallidulus Matsumura 1912: 209 [Syntype (s?): 1♀ in ELKU; ♀, type locality = Kumamoto, Japan, examined]. Synonymy by Ebmer (1978b: 313).

Lasioglossum (Evylaeus) apristum: Ebmer 1978b: 313; Ebmer 1995: 542, Figs 8–9 (♂), 63–64 (♂); Ebmer 2002: 840, Figs 60– 62 (♀); Murao & Tadauchi 2005: 43, Figs 1, 2, 3A –B, 4 (♀ ♂); Murao & Tadauchi 2007: 180, Figs 7, 8, 56A, 58A (♀ ♂), 240 (in key), 248 (in key).

Evylaeus (Evylaeus) apristus: Pesenko 2007b: 82 (in key), 87 (in key), 101, Figs 15–16 (♂).

Diagnosis. Female of this species is separated from other members of the apristum group by a combination of head and mesosoma with weak green-metallic luster and IS of mesoscutum with weak tessellation (sometimes nearly smooth in part) (IS = 3.5–5 d on medial to posterior area in maximum).

Specimens examined. (n = 170) [South Korea] GW: 16♀, Mt. Gariwang-san, Jeongseon-gun, 30. vii. 2013 (R. Murao, cMur) ; 15♀, Bougmyong-ri, Dongsan-myon, Chunchon-gun, 22–23. v. 1992 (O. Tadauchi, ELKU) ; 1♀, Gamjong-ri, Dong-myon, Chunchon-gun, 21. v. 1992 (O. Tadauchi, ELKU) ; 1♀, Jansudae, Inje-gun, 17. iv. 1994 (O. Tadauchi, ELKU) ; 1♀, Mt. Odae-san, 27. iv. 1992 (O. Tadauchi, ELKU) ; 1♀, Ohsaenk-ri, Yangyang-gun, 17. iv. 1994 (O. Tadauchi, ELKU) ; 1♀, Doam-myon, Pyongchang-gun, 20. viii. 2001 (Y. Maeta, SULE) . GB: 1♀, Shinwon-ri, Unmun Chongdo-gun, 26–27. iv. 2003 (Y. Maeta, SULE) . JB: 1♀, Kyongyeo-myon, alt. 1300 m, Gurye-gun, 10. v. 1991 (O. Tadauchi, ELKU) . GN: 1♀, Tam-ri, 18. vii. 1991 (K. Kanmiya, ELKU) . JJ: 9♀, High resting area, Mt. Halla-san, alt. 1100 m, 26. iv. 1997 (O. Tadauchi & J.C. Paik, ELKU) ; 31♀, Kaewol bridge, Mt. Halla-san, 26. vii. 1990 (O. Tadauchi, ELKU) ; 10♂, Orimok-Haeandong, alt. 500–900 m, Jeju-si, 13. ix. 1998 (O. Tadauchi, ELKU) ; Yonsil, Mt. Halla-san, 26♀ 39♂, 24. vii. 1990 (O. Tadauchi, ELKU) , 13♀3♂, 27. vii. 1990 (O. Tadauchi, ELKU).

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

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

Flower records in South Korea. This species has been recorded visiting the following at least 11 plant species in seven families: Asteraceae: Aster yomena, Sonchus sp., Taraxacum spp. Cornaceae: Cornus sp. Caprifoliaceae: Lonicera sp. Oleaceae: Forsythia suspensa . Polygonaceae: Polygonum sp. Rosaceae: Armeniaca sp., Crataegus sp., Potentilla sp. Salicaceae: Salix spp.