Epeolus pusillus Cresson 1864

County records: Livingston, Mecosta, Midland, Oakland, Washtenaw, Wayne.

Notes. Reported to be a cleptoparasite of Colletes compactus (see Rozen & Favreau 1968), but the small body size of E. pusillus and its limited occurrence in certain localities (e.g., Tompkins County, New York) suggest an alternative or additional association with C. americanus (see Ascher et al. 2014).