Family Genus Species Crotalidae Common name Pit vipers Crotalus Rattlesnakes C adamanteus Eastern diamondback C atrox C horridus Western diamondback Timber rattlesnake C viridis C v viridis Western rattlesnake Prairie rattlesnake C v helleri Southern Pacific rattlesnake C v oreganus Northern Pacific rattlesnake C v abyssus C v lutosus Grand Canyon rattlesnake Great Basin rattlesnake C cerastes C ruber Sidewinder Red diamond rattlesnake C mitchellii C lepidus Speckled rattlesnake Rock rattlesnake C tiaris C willardi Tiger rattlesnake Ridge-nosed rattlesnake C scutulatus C molossus Mojave rattlesnake Black-tailed rattlesnake C pricei Twin-spotted rattlesnake S catenatus S miliarius Massasauga rattlesnake Pygmy rattlesnake A piscivorus Water moccasin Sistrurus Agkistrodon Elapidae A contortrix Copperhead Micruroides Sonovan (Arizona) coral snake euryxanthus Micrurus fulvius Eastern coral snake