Red diamond rattlesnake
Cedros Island rattlesnake
San Lorenzo Island Rattlesnake
San Lucan rattlesnake
Red diamond rattlesnake
Southwestern United States (southwestern California) southward through the peninsula of Baja California, Mexico, exclusive of the desert east of the Sierra de Juárez in northeastern Baja California. Occurs on a number of islands in the Gulf of California, including Angel de la Guarda, Pond, San Lorenzo del Sur, San Marcos, Danzante, Monserrate, and San José; along the Pacific coast it is known from Isla de Santa Margarita, off Baja California Sur, and Isla de Cedros, off Baja California, Mexico (McDiarmid et al., 1999).
Holotype: USNM 9209 (McDiarmid et al., 1999).
Type-locality: None given in original description. Smith and Taylor, 1950, Univ. Kansas Sci. Bull. 33:313-380[356], roposed "Dulzura, San Diego County, California" as a possibility (McDiarmid et al., 1999).
