Megachile ( Xanthosarus ) latimanus Say, 1823

Megachile ( Xanthosarus) latimanus Say, 1823 View in CoL

Megachile latimanus Say, 1823: 81 View in CoL .

Megachile ( Xanthosarus) latimanus View in CoL ; Mitchell 1936: 130; 1962: 157. Hurd 1979: 2067. Ivanochko 1979: 268. Fultz 2005: 134. Scott et al. 2011: 56. Sheffield et al. 2011: 79. Reese et al. 2018: 23 View Cited Treatment . Delphia et al. 2019a: 25 View Cited Treatment . Engel 2020: 11.

Megachile ( Delomegachile) vidua Smith, 1853: 192 View in CoL . Mitchell 1935b: 200.

Megachile latimanus View in CoL / perihirta View in CoL ; Pearce 2008: 57.

Diagnosis. The females of M. latimanus cannot be reliably separated from M. perihirta in Montana based on morphology (see Taxonomic Challenges). Megachile latimanus / M. perihirta have 5-toothed mandibles with the deepest emargination between the 3 rd and 4 th teeth, emargination strongly angled towards the 4 th tooth ( Fig. 7F View FIGURE 7 ), and medially incomplete apical setal bands on T3–5. Females are most similar to M. dentitarsus , which has T3–5 apical setal bands consistently wide, as wide medially as laterally. The male of M. latimanus can be identified by its widely expanded and ventrally excavated probasitarsus ( Fig. 8B View FIGURE 8 ), the wide, rounded, ventral protuberance of the mesobasitarsus basally (viewed anteriorly) ( Fig. 8C View FIGURE 8 ), and the widely depressed ventral side of the mesofemur. Males are most similar to M. perihirta , which has mesobasitarsus with narrowly rounded, ventral protuberance basally ( Fig. 8D View FIGURE 8 ) and the smooth, convexly rounded ventral side of mesofemur.

Notes. Megachile latimanus has been recorded in a few scattered localities across Montana ( Fig. 1Q View Figure 1 ). Photographs, a full morphological description (but see Taxonomic Challenges), and notes on the biology of this soil-nesting species can be found in Sheffield et al. (2011).