HORSE and DEER FLIES Family Tabanidae See also PL 13 Identification: Third antennal segment elongate. Calypters large. R4 and R5 divergent, enclosing wing tip.

Tabanids are relatively stout-bodied, medium-sized to large (mostly 10-25 mm.), and many are very common. Females are bloodsucking, and are often serious pests of man and animals. Males, much less often seen, feed on flowers. The eyes meet dorsally in the male and are separated in the female; the eyes are brightly colored or iridescent in many species. Larvae of most species are aquatic. Adults are often abundant near swamps or ponds where the larvae occur, but are strong fliers and may range many miles from their breeding places. Deer flies (Chrysops) are smaller than most other tabanids (House Fly size or slightly larger), black or brownish, and usually have dark spots on the wings; the 3rd antennal segment lacks a basal toothlike process, and there are apical spurs on the hind tibiae. The larger horse flies, most of which are in the genus Tabanus, are usually gray or blackish, generally without dark spots on the wings (some species have entirely dark wings); the 3rd antennal segment has a basal toothlike process and there are no apical spurs on the hind tibiae. Some species of Tabanus, commonly called greenheads, have bright green eyes in life.

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