Genus Dufourea Lepeletier de Saint Fargeau

Dufourea can easily be recognized among bees of the eastern United States by the following characters: two submarginal cells, a single subantennal sulcus below each antennal socket, short clypeus, and antennal sockets below middle of the face (Fig. 1). For generic-level keys see Mitchell (1960), Michener et al. (1994), and Michener (2007).