Crotalus mitchellii

Species of snake

Common names: speckled rattlesnake, Mitchell's rattlesnake, white rattlesnake

Crotalus mitchellii is a venomous pit viper species in the family Viperidae. The species is endemic to the Southwestern United States and adjacent northern Mexico. The species was named in honor of Silas Weir Mitchell (1829–1914), an American medical doctor who also studied rattlesnake venoms. Five subspecies are currently recognized, including the nominate subspecies described here.

Generally, C. mitchelli does not exceed in total length (including tail), with large males measuring between The race on Isla Ángel de la Guarda is known to become larger, the maximum recorded length for a specimen there being In contrast, the population on El Muerto Island only reaches a maximum of in length.

C. mitchelli is found in the southwestern United States and in northwestern Mexico. In the US, its range includes east central and southern California, southwestern Nevada, extreme southwestern Utah, and western Arizona. In Mexico, it is native in most of Baja California, including Baja California Sur. It also inhabits a number of islands in the Gulf of California, including Angel de la Guarda Island, Carmen, Cerralvo, El Muerto, Espíritu Santo, Monserrate, Piojo, Salsipuedes, and San José, as well as on Santa Margarita Island off the Pacific coast of Baja California Sur. !bgcolor="#f0f0f0"|Geographic range recognised C. m. stephensi as a full species, and Meik et al. (2015) elevated both the southwestern and the Angel de la Guarda speckled rattlesnakes to the state of full species, C. pyrrhus and C. angelensis, whereas the El Muerto Island speckled rattlesnake was considered part of C. pyrrhus

The nominate subspecies (C. m. mitchellii ) is classified as "Least Concern" on the IUCN Red List of Threatened Species. The population trend was stable when assessed in 2007.