Scientific name: Corydalus cornutus (Linnaeus)
Facts: Dobsonflies are large (some are over 3 inches long) insects with long membranous wings. The wings are typically held flat over the back when they are at rest. Adults are often attracted to lights but usually only near flowing rivers. The male has extremely long mandibles, not particularly good for biting. However, these mandibles are used to grasp the female during mating. The adult female can be an effective biter if given the opportunity.
Dobsonflies are the adult form of a common aquatic immature called hellgrammite. Hellgrammites are aggressive predators found in flowing streams. They are good fish bait and are very often used as such.