Parasimulium is a genus of black flies containing two subgenera and four species. They are found in western North America. Most species are rare, and some Canadian species are cave dwellers.
Species Subgenus Astoneomyia Peterson, 1977 P. melanderi Stone, 1963 Subgenus Parasimulium Malloch, 1914 P. crosskeyi Peterson, 1977 P. furcatum Malloch, 1914 P. stonei Peterson, 1977
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