Subgenus Diceratosmia Robertson, 2 taxa

Keys taken from descriptions in Rightmyer et al. 2011.

Key to females

Scopal hairs blunt, widened and slightly rounded at their apical tips....Osmia subfasciata

Apical tips of the scopal hairs on S2 and S3 are weakly tapered. Clypeal hairs nearly uniformly short, straight to slightly hooked hairs, slightly longer hairs on the frons....Osmia conjunctoides

Key to males

Punctures on mesoscutum about the same size as those on the scutellum, Anterior margin of T1 trongly curved, forming anterolaterally rounded corners....Osmia subfasciata

Mesoscutum finely and densely punctate; these punctures distinctly smaller than those on the scutellum. T1 less concave along its anterior margin....Osmia conjunctoides