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Agkistrodon

a genus of venomous snakes of the subfamily crotalinae. Twelve species of this genus are found in north and central america and asia. Agkistrodon contortrix is the copperhead, a. Piscivorus, the cottonmouth. The former is named for its russet or orange-brown colour, the latter for the white interior of its mouth. (goin, goin, and zug, introduction to herpetology, 3d ed, p336; moore, poisonous snakes of the world, 1980, p75)