Three New Species of the Subgenus Evylaeus of the Genus Lasioglossum from Eastern Asia (Hymenoptera, Halictidae)

Three new species belonging to the subgenus Evylaeus of the genus Lasioglossum (Halictinae, Halictini) are described from Eastern Asia: L. caliginosum sp. n. and L. miyabei sp. n. from Japan and Far East Russia, and L. yamanei sp. n. from Japan. The three new species are placed into the following species-groups based on Ebmer's classification: L. caliginosum into the fulvicorne-fratellum species-group, and L. miyabei and L. yamanei into the atroglaucum species-group. Photographs, illustrations and SEM photographs of important characters are provided for each species. In addition, diagnosis, distribution map, flight records and floral associations for each species are also given.