Osmia (Melanosmia) bucephala Cresson 1864

County records: Alger, Allegan, Barry, Berrien, Cheboygan, Dickinson, Ingham, Kalamazoo, Kent, Keweenaw, Luce, Marquette, Midland, Montmorency, Oscoda, Schoolcraft, Van Buren.

Notes. Nests from Maryland and Washington, D.C. described by Krombein (1967) and Packard (1867), respectively. Unique among Osmia for its use of wood fibers in cell construction; partitions are made of leaf pulp.