日本におけるザイツムカシハナバチ（ハチ目，ムカシハナバチ科）の再発見

抄録

After more than 120 years since the description of Colletes seitzi Alfken, 1900, it was confirmed that it inhabits the Kantô region (Kanagawa and Chiba Prefectures) so far in Japan. Currently the distribution of two species, C. seitzi and C. esakii belonging to the caspicus species group in Japan was revealed.