Bat Fliesnot illus

Families Streblidae and Nycteribiidae

Identification: Streblidae: winged or wingless, wings when present uniformly veined; head with a fleshy movable neck, and not folding back into a groove on mesonotum; palps broad and extending leaflike in front of head; eyes small or vestigial. Nycteribiidae: wingless, somewhat spiderlike in appearance; head small and narrow and at rest folding back into a groove on mesonotum.

Members of these 2 families are ectoparasites of bats, and are seldom encountered.

HORSE BOT FLIES Family Gasterophilidae

Identification: Beelike flies resembling the Honey Bee. 2nd antennal segment without a longitudinal suture. R5 cell widened distally.

Larvae of these flies develop in the stomach or intestine of horses, and when full grown pass out with the feces and pupate in the ground. Eggs are usually laid on the lips or jaws of the horse, and either burrow through the skin into the mouth, or get into the mouth when licked by the horse. These insects are rather serious pests of horses. Adults are not common, but are generally found in the vicinity of horse barns and pastures.

ROBUST BOT FLIES Family Cuterebridae Identification: Scutellum extends beyond metanotum. Post-scutellum not developed. R5 cell narrowed or closed distally. Large robust flies resembling bumble bees.

Larvae mostly are parasites of rabbits and rodents, usually developing just under the skin. Adults are rare.

BOT and WARBLE FLIES Family Oestridae

Identification: Scutellum very short. Postscutellum usually well developed. R5 cell narrowed or closed distally.

Oestrid larvae are parasites of various animals, including some domestic animals. Ox warbles (Hypoderma) parasitize cattle; larvae develop in boil-like swellings just under the skin, usually on the back of the animal; adults are very annoying to cattle though they do not bite. The Sheep Bot Fly, Oestrus ovis Linn., is a parasite of sheep; its larva develops in the nostrils of the sheep. Adult bot and warble flies are not very common; they are most likely to be found in the vicinity of their hosts.

ANTHOMYIID FLIES Family Anthomyiidae Identification: R5 cell parallel-sided. Hypopleura without bristles. 2A reaches wing margin, at least as a fold. Often only 1

ANTHOMYIID FLIES 305

Scatophaga

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