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B425 (2018) South American Leaf-Cutter Bees (Genus Megachile) of the Subgenera Physsomegachile and Zonomegachile, With Two New Subgenera (Hymenoptera: Megachilidae) by Victor H Gonzalez, Undergraduate Biology Program and Department of Ecology & Evolutionary Biology, University of Kansas; Terry Griswold, USDA-ARS Pollinating Insects Research Unit, Utah State University; and Michael S. Engel, Division of Invertebrate Zoology, AMNH.
