Megachile ( Megachile ) centuncularis ( Linnaeus, 1758 )

Megachile ( Megachile) centuncularis ( Linnaeus, 1758) View in CoL

Apis centuncularis Linnaeus, 1758: 575 View Cited Treatment .

Megachile ( Athemois) centuncularis View in CoL ; Mitchell 1935b.

Megachile ( Megachile) centuncularis View in CoL ; Mitchell 1962: 124; 1980: 25. Butler 1965: 5. Hurd 1979: 2055. Ivanochko 1979: 145. Gonzalez 2008: 35. Scott et al. 2011: 55. Sheffield et al. 2011: 44. Sheffield and Heron 2019: 70.

Diagnosis. The female of M. centuncularis can be identified by its 5-toothed mandibles with evenly deep emarginations between all teeth ( Fig. 7G View FIGURE 7 ), black setae on T6, and yellow to orange scopal setae on S2–6. It is most similar to M. relativa , which has golden setae on T6. The male of M. centuncularis can be identified by its narrow brown to black probasitarsi ( Fig. 8A View FIGURE 8 ), sparse setae on T6, absence of a procoxal spine, and absence of a median tubercle on the clypeus. The male of M. centucularis is most similar to M. lapponica / M. relativa , which has a small triangular median tubercle on the clypeal margin.

Notes. This species is a new state record for Montana, though it is widespread elsewhere in North America. In Montana, it has been sparsely collected in a few western localities ( Fig. 1G View Figure 1 ). Photographs, a full morphological description, and notes on the biology of this species can be found in Sheffield et al. (2011).