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Stilt-legged fly

A group of stilt-legged flies (Rainieria antennaepes), apparently all females, was walking about and ovipositing on a large fallen log. They stop periodically to wave their forelegs, which are marked with white. I think this might be a defensive display, as it resembles the waving antennae of a wasp, but I can find no references on that--it appears to be my own idea. (Well, of course, Thomas Say named this species antennaepes in 1823, and that means "antennae-foot"! I can't find where anyone has mentioned that this is mimicry, specifically.)


-BugGuide account--Rainieria antennaepes

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Taken on June 13, 2009