Perdita (Perdita) maculigera Cockerell 1896 maculipennis Graenicher 1914 ( octomaculata group)

County records: Alcona, Arenac, Delta, Gratiot, Hillsdale, Midland, Newaygo, Saginaw, Tuscola, Washtenaw.

Notes. Specialist on Salix (Salicaceae), especially sandbar willow along streams and rivers. Nesting biology in Kansas described by Michener & Ordway (1963).