Megachile (Litomegachile) onobrychidis Cockerell, 1908

Megachile onobrychidis Cockerell, 1908: 266 .

Megachile (Litomegachile) brevis onobrychidis; Butler 1965: 2. Hurd 1979: 2052. Scott et al. 2011: 55.

Megachile (Litomegachile) onobrychidis; Ivanochko 1979: 90. Sheffield et al. 2011: 41. Bzdyk 2012: 50. Kuhlman and Burrows 2017: 12. Reese et al. 2018: 22. Sheffield and Heron 2019: 70. Engel 2020: 10.

Diagnosis. The female of M. onobrychidis can be identified by the shape of T6, which is strongly convex basally and concave apically (Fig. 7K), black setae on T6, 4-toothed mandibles with an even semicircular emargination between the 3 rd and 4 th teeth (Fig. 7B), and black scopal setae on S6. The females are most similar to M. brevis (see M. brevis above). The male of M. onobrychidis can be identified by the sparse setae on T6, the shape of the procoxal spine, which is longer than wide, and the shorter ocelloccipital distance compared to the ocellocular distance (Fig. 8L).

Notes. Megachile onobrychidis is found across Montana, though like many other species, has been less collected in eastern parts of the state (Fig. 1Y). Photographs, illustrations, full morphological descriptions, and notes on its biology can be found in Sheffield et al. (2011) and Bzdyk (2012).