MEXICAN TAILLESS AMPHIBIANS 



61 



Range. — From 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 follows: Dallas (Dallas), Somervell (Glen Rose), 

 Tom Green (Fort Concho), McLennan (Waco), Burnet (Sherrard 

 Ranch), Hays (San Marcos, Wimberley, and Devils Canyon), Kendall 

 (Boerne), Bexar (San Antonio and Helotes), and Duval (San Diego). 

 The occurrences along the Rio Grande River by counties are as 

 follows : Cameron (Brownsville), Starr (Ringgold Barracks), Val Verde 

 66785—32 5 



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Figure 13. — Head of Bufo punctatus 

 (U.S.N. M. No. 12661) from La Paz, 

 Lower California: a, Lateral view; 

 6, dorsal view 



