Fossil Therevidae (Insecta: Diptera) from Florissant, Colorado (upper Eocene)

摘要

The previously reported fossil dipteran insects assigned to the family Therevidae from Florissant, Colorado, are re-examined and re-described and photographs of all holotypes are included, together with detailed interpretive illustrations. Nebritus willistoni Melander, 1949 is moved to the Order Trichoptera as incertae sedis; Psilocephala hypogaea Cockered, 1909, is moved to the genus Taracticus in the family Asilidae (Diptera); while Ruppellia vagabunda Cockerell, 1927, is moved to the genus Apsilocephala in the family Apsilocephalidae. The new genus Palaeopherocera gen. nov. is erected for Psilocephala scudderi Cockerell, 1909, the only true therevid known from Florissant shale.