Male eastern dobsonfly

6933.       This was swimming in our pool. No idea what it is. Paris, ON. Canada

Number 6933. This is a male eastern dobsonfly, Corydalus cornutus (Megaloptera: Corydalidae), it would have been drowning, not swimming. Dobsonfly larvae (hellgrammites) are aquatic, but the adults are strictly aerial. The long, sickle-like mandibles of males are harmless, but those of the females (as well as hellgrammites) are very stout and can draw blood. Click here for more detailed information.