Megachile ( Megachile ) inermis Provancher, 1888

Megachile ( Megachile) inermis Provancher, 1888 View in CoL

Megachile inermis Provancher, 1888: 323 View in CoL . Drons 2012: 58.

Megachile ( Anthemois) inermis View in CoL ; Mitchell 1935b: 171.

Megachile ( Megachile) inermis View in CoL ; Mitchell 1962: 126. Hurd 1979: 2055. Ivanochko 1979: 133. Scott et al. 2011: 55. Sheffield et al. 2011: 45. Sheffield and Heron 2019: 70.

Diagnosis. The female of M. inermis can be identified by its distinctively large body size ( 17–20 mm long), shiny clypeus with sparse punctation medially (punctures 1–3 diameters apart), and clypeal margin with four prominent tubercles. The male of M. inermis can be identified by its large body size ( 11–16 mm long), unevenly spaced 3- toothed mandibles (2 nd tooth closer to apical tooth), and its nub-like procoxal spine, which is wider than long and covered with a small tuft of dense orange setae. Males are most similar to M. montivaga , which has evenly spaced teeth.

Notes. Megachile inermis , a distinctively large species, has been recorded in several localities in western Montana ( Fig. 1O View Figure 1 ). This species is known to nest in cavities and rotting logs ( Sheffield et al. 2011). Photographs, a full morphological description, and notes on its biology can be found in Sheffield et al. (2011).