. Bulletin - United States National Museum. Science. Range.âFrom the Mexican boundary southward through Sonora, Chihuahua, Coahuila (Monclova and Castanuelas), and Tamaulipas (Sierra Nola) to San Luis Potosi and Guanajuato (Silao). In the Unites States the species is confined to the region west of the Mis- sissippi River, where it occurs locally as far east as the Wichita Mountains (Mount Scott, Comanche County, Okla.). It has been taken in southwestern Colorado (Basin Creek, San Miguel County) in a small alkaline stream whose waters reach the Colorado River by way of the San Miguel and Dolore
. Bulletin - United States National Museum. Science. Range.âFrom the Mexican boundary southward through Sonora, Chihuahua, Coahuila (Monclova and Castanuelas), and Tamaulipas (Sierra Nola) to San Luis Potosi and Guanajuato (Silao). In the Unites States the species is confined to the region west of the Mis- sissippi River, where it occurs locally as far east as the Wichita Mountains (Mount Scott, Comanche County, Okla.). It has been taken in southwestern Colorado (Basin Creek, San Miguel County) in a small alkaline stream whose waters reach the Colorado River by way of the San Miguel and Dolores Rivers. Along the San Juan River in southeastern Utah this toad has been found at a number of localities (Blufi', Natural Bridges, and Caroline Bridge in San Juan County). In northern Arizona it has been found on the floor of the Grand Canyon between the Coconino and Kaibab Plateaus, and in southwestern Utah in the drainage of the Virgin River (Zion National Park, Washington County). It has been found in eastern California in the Panamint Mountains (Cottonwood Canyon, Inyo County) and in Death Valley (Furnace Creek). South of these localities it has been reported in California from the Turtle Mountains (San Bernardino CountjO^ Fort Yuma, the Imperial Valley, and in San Diego County (Vallecito); and thence southward in Lower California to Cape San Lucas. In west-central Arizona the red-spotted toad has been taken in the drainage of Salt River and its tributaries (White River Canyon, Navajo County; and McMillenville, Gila County). It has also been recorded in Arizona from Mari- copa County (Cave Creek), Pima County (Catalina Mountains near Tucson), Santa Cruz County (Crittendon), and Cochise County (Ramsay Canyon, Huachuca Mountains). It is known to occur in extreme southwestern New Mexico (Dog Spring and Dog Mountains, Hidalgo County). With the exception of the panhandle region, this toad is distributed locally over the western half of Texas. The records by counties are as fo
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