The Eastern Dobsonfly is Corydalus cornutus . Drawings of a larval Dobson fly can be seen at this water bug site under hellgrammite. Drawings of a larval and adult dobson fly can be seen at this site . Fishflies Fishfly larvae, Chauloides species, look like Dobson fly larvae, but only grow to about an inch long. Larvae eat aquatic insects by seizing them in their jaws.
Nocturnal adults look like a cross between a cicada and a moth.
They are poor flyers and easy to catch. Beetles Coleoptera , or beetles, have a few species with aquatic larvae which are very predatory. Diving beetles and whirligigs are common adult beetles which stick around the pond. Most beetle larvae can be identified separately from other insects because their body is often covered in a much thicker, black plating and some species have long filaments off the sides of their bodies. One species of larvae looks like a caddisfly larvae with a suit of armor.