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Corydalus cornutus
About 2.5 inches long
Just wanted to drop in and say it's the jaw- males have quite possibly the most distinct looking pair of jaws this side of a walrus.
http://www.fcps.edu/islandcreekes/ecolog...
Thanks for the answer, you are absolutely right. How can you tell it's a female?
I would say this looks like a female (!) Corydalus cornutus, a quite common dobsonfly in US.
http://en.wikipedia.org/wiki/Dobsonfly