Coelioxys (Synocoelioxys) alternatus Say 1837

County records: Alpena, Cass, Gladwin, Ingham, Jackson, Kalamazoo, Kent, Lapeer, Livingston, Saginaw, Shiawassee, St. Joseph, Van Buren, Wayne.

Notes. Recorded as a cleptoparasite of Megachile pugnata say (Medler 1964a), an association frequently seen in Michigan (JG, pers. obs).