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Family: Corydalidae
DrNamgyalT.Sherpa, we do not have any Dobsonflies in North America with this coloration. Ours are boring brown. The mouth parts on this insect are not consistent either. Dobsonflies have large mandibles (females) or extra-large long mandibles (males).
Here is a similar looking Stonefly. http://bugguide.net/node/view/407354
Possibly a Stonefly of some type. Order Plecoptera. http://bugguide.net/node/view/76