Perdita (Cockerellia) albipennis Cresson 1868 pallidipennis Graenicher 1910

County records: Allegan, Barry, Berrien, Kalamazoo.

Notes. Specialist on Helianthus (Asteraceae) . Nest from Kansas described by Danforth (1989). Wolf & Ascher (2009) expressed doubt regarding the status of this subspecies, and suggested it may be a subspecies of P. bequaerti Viereck (see below). If correct, then only a single species of Perdita (Cockerellia) would be present in Michigan.