Viperidae

Crotalus triseriatus Wagler, 1830

Crotalus triseriatus is a small Mexican rattlesnake found in highland habitats of the Transverse Volcanic Cordillera.

Crotalus ruber Cope, 1892

Crotalus ruber (red diamond rattlesnake) is a moderately large reddish rattlesnake found in northwestern Mexico and southwestern California.

Crotalus pricei Van Denburgh, 1895

Crotalus pricei is a small rattlesnake found in southeastern Arizona and northern Mexico, with distinct paired dorsal blotches.

Crotalus stephensi Klauber, 1930

Crotalus stephensi is a rattlesnake species native to mid-elevation desert mountains of California and Nevada.

Crotalus lepidus Kennicott, 1861

Crotalus lepidus Kennicott, 1861 is a small ovoviviparous rattlesnake found in the southwestern US and northern central Mexico.

Crotalus intermedius Troschel, 1865

Crotalus intermedius is a small rattlesnake found in central and southern Mexico at 2000–3200 m elevation.

Crotalus horridus Linnaeus, 1758

Crotalus horridus, the timber rattlesnake, is a venomous snake native to eastern US deciduous forests.

Crotalus enyo Cope, 1861

Crotalus enyo is a small-headed rattlesnake found in Baja California and surrounding Gulf islands with varied arid habitats.

Crotalus cerastes Hallowell, 1854

Crotalus cerastes, or sidewinder/horned rattlesnake, is a small desert viper with characteristic supraocular eye horns.

Crotalus transversus Taylor, 1944

Crotalus transversus Taylor, 1944 is a rattlesnake found only in high-elevation temperate boreal forests of central Mexico.

Crotalus tigris Kennicott, 1859

Crotalus tigris (tiger rattlesnake) is a small rattlesnake native to the southwestern US and northwestern Mexico.

Crotalus polystictus (Cope, 1865)

Crotalus polystictus is a venomous rattlesnake found on the central Mexican plateau at mid-to-high elevations.

Crotalus atrox Baird & Girard, 1853

Crotalus atrox, the western diamondback rattlesnake, is a large North American venomous pit viper with a characteristic diamond-patterned body.

Crotalus oreganus Holbrook, 1840

Crotalus oreganus is a North American rattlesnake with variable size, coloration, and well-documented life history traits.

Crotalus adamanteus Palisot De Beauvois, 1799

This is the eastern diamondback rattlesnake, the largest rattlesnake species native to the southeastern United States.

Crotalus aquilus Klauber, 1952

Crotalus aquilus is a small, heavy-bodied rattlesnake found in highland habitats of central Mexico.

Crotalus basiliscus (Cope, 1864)

Crotalus basiliscus is a large rattlesnake species native to the western Mexican coastal plain.

Crotalus ravus Cope, 1865

Crotalus ravus is a moderately stout rattlesnake found only in temperate high elevations across central and southern Mexico.

Crotalus viridis Rafinesque, 1818

Crotalus viridis (prairie rattlesnake) is a North American rattlesnake with specific traits and viviparous reproduction.

Crotalus simus Latreille, 1801

Crotalus simus is a rattlesnake species found from Mexico to Colombia with documented traditional medicinal use by Maya people.

Crotalus ornatus Hallowell, 1854

Crotalus ornatus is a medium-sized black-tailed rattlesnake native to the southwestern US and Mexico.

Crotalus campbelli Bryson Jr, Linkem, Dorcas, Lathrop, Jones, Alvarado-Díaz, Grünwald & Murphy, 2014

Crotalus campbelli is a 2014-described Mexican rattlesnake found in rocky montane areas of western Mexico.

Crotalus molossus Baird & Girard, 1853

Crotalus molossus, the black-tailed rattlesnake, is a medium-sized venomous rattlesnake found in the southwestern US and Mexico.

Crotalus armstrongi Campbell, 1979

Crotalus armstrongi, the western dusky rattlesnake, is a small venomous pit viper endemic to Mexico with no recognized subspecies.