Acid Flies are a fictional species featured in the novel The Wandering Inn.
Acid Flies are annoying bugs found in the Flood Plains. They resemble house flies in behavior, and physically look like large fireflies whose backsides glow a faint green. They are, however, infinitely more dangerous, as, if an acid fly suffers a commotion of any sort, her acid-filled backside will explode, sprinkling anyone in its vicinity with the deadly liquid. As long as the acid is removed, however, acid flies are considered a delicacy by Antinium and Drakes.