| Sistrurus catenatus |
Sistrurus catenatus catenatus |
Eastern massasauga |
| Sistrurus catenatus edwardsi |
Desert massasauga |
| Sistrurus catenatus tergeminus |
Western massasauga |
| Sistrurus miliarus |
Sistrurus miliarus barbouri |
Dusky pigmy rattlesnake |
| Sistrurus miliarus miliarus |
Carolina pigmy rattlesnake |
| Sistrurus miliarus streckeri |
Western pigmy rattlesnake |
| Sistrurus ravus |
Sistrurus ravus ravus |
Mexican pigmy rattlesnake |
