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Hybomitra frontalis
horse fly
Hybomitra frontalis is a Nearctic horse fly species in the family Tabanidae. It is among the most widely distributed, abundant, and troublesome biters of animals and humans in North America. The species exhibits extreme variation in color and size across its range, particularly in Canadian populations from Nova Scotia, Labrador, and central Manitoba. Taxonomic relationships within the H. frontalis complex have been debated for over a century, with five nominal species described from regional populations.