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Pyrgotella chagnoni is a fly in the Light Fly Family (Pyrgotidae). It is endemic to eastern North America, from Minnesota to North Carolina and northeastward (Steyskal 1987). The adults are reddish-brown, slender, medium-sized flies. The long legs are yellow and with extensive dark brown areas, and the wings are hyaline with dark markings (Johnson 1900).
Little is known about the natural history of this species, but pyrgotid larvae are generally internal parasites of adult scarab beetles, and the female oviposits into the abdomen of the beetle while both are in flight (Steyskal 1978).