Perdita (Perdita) gerhardi gerhardi Viereck 1904 ( octomaculata group)

County records: Allegan, Barry, Cass, Newaygo, Van Buren.

Notes. Specialist on Monarda punctata L. ( Lamiaceae). Large numbers have been observed on dunes near Lake Michigan. Nesting in central Illinois described by Miliczky (1991).