Robber flies are opportunistic predators, their diets often reflecting prey availability in a particular habitat. Ospriocerus latipennis. The robber fly shown here, apparently another Efferia species, was in Madera Canyon, Davis Mountains, Jeff Davis Co., Texas, in June, 2005. They are powerfully built, bristly flies with a short, stout proboscis enclosing the sharp, sucking hypopharynx. Robber flies are distinctive, medium-sized to large, bristly or hairy flies. This species particularly likes bees and dragonflies as well as biting flies. Contact. The next two images of an unknown Efferia species were taken in Starr Co., Texas, in May, 2010. Robber flies are predators on other insects, as you might expect. I recently photographed that same Giant Robber Fly in Pasadena, Texas on a bayou. Photographed near my house in Austin. The Asilidae are a family in the order Diptera, the true flies.The common name for members of the family is the robber flies.The Asilidae are cosmopolitan, with over 7000 described species. The legs are reddish-brown and hairy. The Asilidae are the robber fly family, also called assassin flies. This is one of the Giant Robber Flies in the genus Promachus. The Efferia species robber fly shown here was at Bentsen State Park, Hidalgo Co., Texas, in June, 2008. Possibly the world's ugliest robber fly Mallophora leschenaulti. Robber fly insects are a mixed blessing to gardeners; if they’re seriously perturbed, they can inflict a painful bite, but they also help rid the garden of harmful pests like grasshoppers, other flies, wasps, leafhoppers, white grubs and pupating beetles. Robber fly, (family Asilidae), any of about 6,750 species of predatory insects, worldwide in distribution, in the fly order, Diptera. There are over 1,000 species of robber flies (family Asilidae) in North America; and nearly 100 have been recorded from the Upper Midwest. Most have a long, tapered abdomen, a rather humpbacked appearance, and spiny legs, and typically rest with wings folded down the back. El Paso County Office 301 Manny Martinez Senior Dr. 2nd Floor El Paso, TX 79905; el-paso-tx@tamu.edu; Phone: 915-771-2354; 915-771-2356 Subfamily Dasypogoninae. An introduced species in Texas, and rather rare, at least so far. Maybe 4 cm long. During the day, the Robber Fly hangs by its front legs from branches or objects near the ground, waiting to ambush passing prey. Very large, appears black in normal light, hump-backed, hairy, and burly. A wide range of ecotypes – from wide open mountain ranges in the west, dense tall forests in the east, brush country of the south, and grasslands of the north – all contributing to extensive … Continue reading "Texas Fireflies" Robber flies are a diverse group of predatory flies that typically perch in an open area, swiveling their heads to look around, then flitting out to chase insect prey. The common name for this group comes from their ferocious manner of pouncing from the air on their prey. Spotted by gatorfellows. Latreille was the authority for establishing the family in 1802. Field Guide: Fireflies of Texas by Ben Pfeiffer Texas is one of the most bio-diverse states in the continental US. 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