Megachile (Litomegachile) coquilletti Cockerell, 1915

Megachile mendica coquilletti Cockerell, 1915: 535 .

Megachile (Litomegachile) coquilletti; Mitchell 1935a: 21. Butler 1965: 2. Hurd 1979: 2052. Ivanochko 1979: 93. Sheffield et al. 2011: 35. Bzdyk 2012: 41. Kuhlman and Burrows 2017: 12. Sheffield and Heron 2019: 70.

Diagnosis. The female of M. coquilletti can be distinguished by its moderately concave T6 (Fig. 7M) with brown to black setae (often with suberect pale setae in small patches laterally), 4-toothed mandibles with a semicircular, symmetrical emargination between the 3 rd and 4 th teeth (Fig. 7B), and long transverse medial carina on the apical margin of the clypeus (four times as long as diameter of median ocellus) (Fig. 6H). Females are difficult to distinguish from M. lippiae, which has suberect pale setae and erect black setae on T6 and a short medial carina on the apical margin of the clypeus (two times as long as diameter of median ocellus) (Fig. 6G). For further details on identification issues see Taxonomic Challenges. The male of M. coquilletti can be distinguished by its narrow probasitarsus (Fig. 8A), which is not excavated ventrally, and light to dark yellow coloration on tarsomeres 2–4.

Notes. This species has been collected in central and western Montana (Fig. 1H). Photographs, illustrations, full morphological descriptions, and notes on the biology of this species can be found in Sheffield et al. (2011) and Bzdyk (2012).