VCSU Macro-Invertabrate Lab
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Order Diptera - The Horse and Deer Flies
Distinguishing characteristics - Larvae of the horse flies and deerflies have an elongate body that tapers at both ends (Fig. A). Abdominal segments 1-7 possess several encircling rings (Fig. B) and the abdomen ends in a small respiratory siphon (Fig. C). The head is partially retracted into the thorax (Fig. D).

Tolerance Value - 7

Feeding Group - Predator

Notes - Female adult horse flies and deer flies inflict a painful bite to both humans and animals. The larvae are almost always aquatic or semiaquatic and are found in a wide variety of aquatic environments. Most are predators, however Chrysops, one of the most common genera, feed on fine detritus. The size of the horse and deer Fly larvae at maturity is 11-55 mm.

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