California Department of Fish and Wildlife
Aquatic Biological Assement

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Tabanidae Level 1 Level 2



Key Characters

 "Horse flies" and "Deer flies." Head minute,  body elongate & cylindrical w/ both ends tapered, short siphon on posterior end. Abdominal segments w/ pairs of dorsal, ventral, and lateral prolegs or "creeping welts".

Tolerance usually 8, 5 in Tabanus sp.
Distribution CA, OR, WA, NV, AZ, Baja