Rattlesnake species list (there are several other kinds of reptiles & a few arthropods, which I will not list - this is rattlesnakes only).
Crotalus adamanteus (eastern diamondback)
Crotalus atrox (western diamondback)
(four morphs - typical, white, black, striped)
Crotalus atrox x viridis (w diamondback & prairie cross)
Crotalus cerastes laterorepens (colorado desert sidewinder)
Crotalus durissus durissus (costa rican)
Crotalus durissus terrificus (brazilian)
Crotalus horridis (timber)
Crotalus lepidus klauberi (banded rock)
Crotalus lepidus lepidus (mottled rock)
Crotalus mitchelli pyrrhus (southwest speckled)
Crotalus mitchelli stephensi (panamint speckled)
Crotalus molossus molossus (black tailed)
Crotalus oreganus cerberus (arizona black)
Crotalus oreganus concolor (midget faded)
Crotalus oreganus helleri (southern pacific)
Crotalus oreganus lutosus (great basin)
Crotalus oreganus oreganus (northern pacific)
Crotalus ruber ruber (red diamond)
Crotales scutulatus scutulatus (mojave)
(two morphs - typical, half striped)
Crotalus simus culminatus (northwest neotropical)
Crotalus tigris (tiger)
Crotalus viridis nuntius (hopi)
Crotalus viridis viridis (prairie)
Sistrurus catenatus edwardsi (desert massasauga)
Sistrurus miliaris barbouri (dusky pygmy)