Coelioxys (Boreocoelioxys) porterae Cockerell 1900

County records: Alger, Alpena, Cheboygan, Clinton, Delta, Emmet, Hillsdale, Huron, Iron, Kalamazoo, Keweenaw, Mackinac, Marquette, Mecosta, Midland, Muskegon, St. Joseph.

Notes. Hosts include Megachile frigida (Baker 1975) and M. relativa (Mitchell 1962; Sheffield et al. 2008).