Reference

Yasuo Maeta, Shôichi Francisco Sakagami, Andreas Werner Ebmer, Takeshi Matsumura (1982): Biomics of the Halictine Bees in Northern-Japan. II. Lasioglossum (Evylaeus) sakagamii (Hymenoptera, Apoidea, Halictidae), with Taxonomic Notes on Allied Species. – Kontyu – 50/2: 198 - 211.