Green horse fly, Chlorotabanus crepuscularis Bequaert (Tabanidae)

By Lindsey Tarkington

Green horse fly, Chlorotabanus crepuscularis Bequaert. © 2012, C.C. Wirth.

The green horse fly, Chlorotabanus crepuscularis Bequaert (18 mm) is the only distinctly bright yellow-green horse fly in North America. Males have large compound eyes that are touching on the front of the head; those of the female are separated by a small gap. Adults are most active at dusk and dawn in spring and summer, especially from May to July. The predaceous larvae live in wet soils in woodland habitats. Blood-feeding females find their mammalian hosts by tracking exhaled carbon dioxide. This species is widespread in moist, wooded habitats in Virginia and is found throughout eastern United States to southern Arizona.


BugGuide. Species Chlorotabanus crepuscularis. Iowa State University Entomology, 10 May, 2005. Web.1, July 2012. <;

Marlos, Daniel. What’s That Bug? Horse Fly: Chlorotabanus crepuscularis. 14 May, 2011. <; (accessed 1 July, 2012)


Golden-backed snipe fly, Chrysopilus thoracicus (Fabricius) (Rhagionidae)

By Trey Creekmore

Golden-backed snipe fly, Chrysopilus thoracica (Fabricius). © 2012, A.V. Evans.

The Golden-backed Snipe fly, Chrysopilus thoracicus (Fabricius) (10 mm) has a round head, distinctive golden patch of hairs on top of the thorax, dark wings, tapered abdominal segments with white spots, and long legs. They greatly resemble a wasp or a bee. Little is known about the natural history of this species. Adults are active in late spring and early summer and are thought to prey on other insects, but this has not been confirmed. This species is common in Virginia woodlands and occurs throughout eastern North America.


Species Chrysopilus thoracicus – Golden-backed Snipe Fly. (accessed 12 July 2012)