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Mydas clavatus is the largest fly found in North America. It is distributed in Canada surrounding the Great Lakes area, and in the United States occurring east of Nebraska. They are the most commonly encountered species of Mydidae in eastern North America while the largest species diversity of this family in general occur in desert or semi-desert environment. Malloch 1917: pg 371; Wilcox, Papavero, & Pimental 1989: pg 7.