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Range DescriptionThis species formerly ranged from San Luis Obispo County, California, USA, south to north-western Baja California in Mexico; see Gergus, Sullivan and Malmos 1997 for southernmost record. It is now apparently extirpated in San Luis Obispo County; populations persist in headwater areas of streams in Santa Barbara, Ventura, Los Angeles, Riverside, and San Diego counties; recent sightings of scattered individuals have been reported from Orange, San Bernardino, and southern Imperial counties (USFWS 1994). The majority of the remaining populations in Santa Barbara and Ventura counties are in Los Padres National Forest (five viable populations); Sespe Creek in Ventura County has the largest known population. Other populations occur in the Sisquoc, Santa Ynez, and upper and lower Piru drainages (USFWS 1994). It also occurs in San Diego County along the Santa Margarita, Guejito, Sweetwater, Vallecito, San Luis Rey, Santa Ysabel, Witch, Cottonwood, Temescal, Agua Caliente, Santa Maria, Lusardi, Pine Valley, Noble, Kitchen, Long Potrero, Upper San Diego, San Vicente, and Morena drainages; populations in the Temescal, Agua Caliente, Pine Valley, and Cottonwood drainages may be considered viable (USFWS 1994). It was recently recorded in Whitewater Canyon in Riverside County (Patten and Myers, 1992, Herpetol. Rev. 23:122). Recent surveys located very small populations in four creeks in south-western Riverside County (Temecula, Arroyo Seco, San Mateo, and Tenaja creeks) (USFWS 1994). The single recent record in San Bernardino County is from Deep Creek in the San Bernardino National Forest. It is also still extant in north-western Baja California.