Hylaeus (Hylaeus) mesillae (Cockerell 1896) cressonii (Cockerell 1907) ( mesillae group)

County records: Allegan, Antrim, Arenac, Barry, Bay, Berrien, Branch, Calhoun, Cass, Charlevoix, Cheboygan, Clare, Clinton, Crawford, Dickinson, Gladwin, Grand Traverse, Gratiot, Huron, Ingham, Ionia, Iosco, Isabella, Jackson, Kalamazoo, Kalkaska, Kent, Keweenaw, Leelanau, Livingston, Macomb, Manistee, Marquette, Mecosta, Midland, Montcalm, Montmorency, Muskegon, Newaygo, Oakland, Oceana, Otsego, Ottawa, Saginaw, Shiawassee, Tuscola, Van Buren, Washtenaw, Wayne, Wexford.

Notes. Stem nesting recorded by Rau (1922) and Hicks (1926) from Missouri and Colorado, respectively.