1922] 



Schmidt, Amphibians und Reptiles of Lower California 



049 



CaUisaurus centralis ventralis (part) Stejneger and Bakbour.1917, p. 47. 



Range. — Lower California from La Paz north to the deserts of southern Cali- 

 fornia and adjacent areas in Arizona. 



Lower Californian Records. — San Luis Gonzales Bay, Townsend, 1890, p. 

 144; El Llano de Santano, San Ignacio, Santa Margarita Island, Van Denburgh, 

 1S95, p. 97; San Fernando, Seven Wells (Sal ton River), Gardner's Laguna (Colorado 

 Desert), Cope, 1900, p. 273; Trinidad, San Matias, San Felipe, Canon Esperanza, 

 San Antonio, Matomi, and Aguas Escondita, Meek, 1905, p. 7; San Jose Island, 

 Carmen Island, Agua Verde Bay, Conception Bay, Mulege, San Francisquito 

 Bay, Dickerson, 1919, pp. 465-66; San Xavier, Van Denburgh and Slevin, 1921«, 

 p. 57. 



Specimens in the Biological Survey collection come from Alamo 

 (U. S. N. M. No. 37042), Rancho San Antonio (37040-1), Volcano Lake 

 (37047-9), Cocopah Mts., east base (37050-1), San Felipe Bay (37035-0), 

 San Francisquito (37039), San Ignacio (37043), and Santo Domingo, 

 Magdalena Plain (37045). 



With the northern Lower Californian specimens collected by 

 Heller and recorded by Meek (loc. cit.) before me in addition to those of the 

 Biological Survey collection, I am unable to find any adequate character 

 by which they could be distinguished from the peninsular specimens 

 described by Dickerson as C. plasticus. An examination of the measure- 

 ments of all the Lower Californian specimens at hand indicates that they 

 are not distinguishable ; the results of the tabulation may be condensed 

 as follows. 



