1922] 



Schmidt, Amphibians (turf Reptiles of Lower California 



651 



and thirty-lour have them separated by a row of scales. The general con- 

 clusion, therefore, is that the range of C. v. gabbii should include the 

 desert areas of southern California and of Arizona west of Tucson. 



In the larger series of specimens reported by Van Denburgh (1921, 

 p. 33) the notable difference in tail-length between the series from Yuma 

 and the other Arizonan specimens confirms this conclusion. In his table, 

 however, the specimens from Cavecreek, Maricopa County, are indistin- 

 guishable from myurus. It is evident, therefore, that further study is re- 

 quired to establish the limits of ventralis and myurus. The range of 

 variation in the characters above discussed is shown in the following 

 tabulation for the several forms of Callisaurus. 



Uma notata Baird 

 Plate LIII 

 Uma notata Baird, 1858, p. 253. 

 Callisaurus notatus Stejneger and Barbour, 1917, p. 47. 



Range. — Deserts of southern California and northeastern Lower California. 

 Lower Californian Records. — Gardner's Laguna, Cope, 1900, p. 281 ; Laguna 

 Salada, 80 mi. south of Mexicali, Van Denburgh and Slevin, 1921a, p. 56. 



While Uma (of which I recognize only a single species) is unques- 

 tionably more closely allied to Callisaurus than to any other iguanid 

 genus, I do not believe that it is directly allied to Callisaurus crinitus, 

 nor that the occurrence of digital fringes in crinitus necessitates the refer- 

 ence of Uma notata to Callisaurus. 



Uma is distinguished from all of the species of Callisaurus by its 

 unique dorsal color pattern and structurally by the presence of an inter- 



