Dasysyrphus amalopis (Osten Sacken)
Dasysyrphus amalopis (Osten Sacken, 1875).
Osten Sacken, C.R. (1875) On the North American species of the genus Syrphus (in the narrowest sense). Proceedings of the Boston Society of Natural History (1875-1876) 18, 135-153.