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Blackfly

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Blackfly

 
Blackflies, Simulium sp. (Diptera: Simuliidae), larvae. Photo by J. V. Robinson.

Blackflies, Simulium sp. (Diptera: Simuliidae), larvae. Photo by J. V. Robinson.

Adult flies are small (1-5 mm) and vary in color by species, usually being black or gray, light tan or yellow. Adults are typically robust with a characteristic arched or humped back (prothorax) giving rise to the common name, “buffalo gnat.” Blackfly species are common along fast moving rivers at certain times of the year, particularly in northeast Texas. There, various confined birds have been killed because of attacks by large numbers of black flies.

For more information, see A Field Guide to Common Texas Insects online or purchase the book through Amazon or other booksellers.

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