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black fly
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any of a family (Simuliidae) of small, dark, dipterous flies of North American forests and mountains, whose larvae live attached to rocks in swift water: most species live on the blood of mammals and may transmit disease
See black fly in American Heritage Dictionary 4
noun
Any of various small, dark-colored biting flies of the family Simuliidae, the larvae of which attach to rocks in running streams. Also called buffalo gnat.
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