Reference
Michael Kuhlmann (1999): Colletes wolfi spec. nova from Italy, and Lectotype designation for Palaearctic Bees of the Genus Colletes LATR., with Notes on new Homonymies and Synonymies (Hymenoptera: Apidae: Colletinae). – Linzer biologische Beiträge – 0031_1: 71 - 81.