Megachile (Litomegachile) onobrychidis Cockerell, 1908

Pritchard, Zoe A., Ivie, Michael A., O’Neill, Kevin M. & Delphia, Casey M., 2025, A faunal treatment of the Megachile (Hymenoptera: Megachilidae) of Montana with a key for their identification, Zootaxa 5683 (1), pp. 1-51 : 37

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).

Figures

FIGURE 1. County-level distribution of each Megachile species in Montana. Females identified as Megachile latimanus/ Megachile perihirta (and data without recorded specimen sexes) are counted here as M. perihirta as they are not distinguishable from one another in Montana. Males identified as Megachile lapponica/Megachile relativa (and data without recorded specimen sexes) are counted here as M. relativa as they are not distinguishable from one another in Montana. Mitchell county records are included on maps but not in specimen counts. Two specimens did not have county-level localities and are not included in maps but are included in specimen counts.

FIGURE 7. Female Megachile characters. (A–H) Anterolateral view of mandible, (I–N) Lateral view of metasoma, tergites 4–6, (O) Lateral view of tergites on M. dakotensis, and (P) Lateral view of head with pronounced tooth on the posterior genal margin on M. pugnata.

FIGURE 8. Male Megachile characters. (A) Probasitarsus not expanded or excavated ventrally, (B) Probasitarsus widely expanded and excavated ventrally, (C–E) Anterior view of mesobasitarsus and mesotibia, (F) Lateral view of triangular metatarsomeres on M. manifesta, (G) Lateral view of quadrate metatarsomeres on M. wheeleri, (H) Ventral view of procoxal spine, longer than wide, (I) Ventral view of procoxal spine, wide and spatulate, (J–L) Dorsal view of vertex of head: (J) Ocelloccipital distance longer than ocellocular distance, (K) Ocelloccipital distance equal to ocellocular distance, and (L) Ocelloccipital distance shorter than ocellocular distance.