Abstract
Megachile is treated here as a single genus combining Megachile with Chalicodoma. In the Americas the genus occurs from Alaska and Canada to southern Chile and Argentina, and is well represented in the tropics. Despite their economic and ecological importance as pollinators, the biology of few species has been studied in detail largely because they are difficult to identify. The 419 species in the catalogue are allocated to 28 subgenera (including 10 Old World species introduced to the region and one species dubiously recorded from the New World). Summaries of information on each species’ classification, biology and geographical distribution are given.References
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