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Corydalidae (Dobson flies, fishflies; subclass Pterygota, order Megaloptera) Family of large, soft-bodied insects which have a fluttering flight pattern and are often found near streams. Adults possess ocelli, and the larvae (called hellgramites and used as fish bait), which are found in streams and under stones, have a pair of hooked anal prolegs, but lack a terminal filament. Male Dobson flies of the genus Corydalus have mandibles three times the length of the head.