1913] Atsatt: Reptiles of tin San Jacinto Area 33 



DISCUSSION OF SPECIES 



Callisaurus ventralis (Hallo well) 



Gridiron-tailed Lizard 



Distribution: Recorded as follows: Vallevista, 1800 feet, nos. 502- 

 3; Cabezon. 1700 feet, nos. 176, 187; Whitewater, 1130 feet, no. 147, 

 nos. *27-32; Dos Palmos Spring, 3000-3500 feet, nos. 242, 238-9, 

 476-7, 479-482, 484, 561-2 ; Pinon Plat, 4000 feet, nos. 47S. 483 ; Deep 

 Canon, 3000 feet, no. 241 ; Palm Canon, 2500 feet, no. 240. 



The gridiron-tailed lizard is generally a Lower Sonoran form, but 

 on the desert side of the Santa Rosa mountains it ranges up into 

 the Upper Sonoran area on Pinon Flat. Here, however, the pinon 

 belt occurs on a ridge between two Lower Sonoran areas. The species 

 was most common in Whitewater, Deep Canon and Dos Palmos, that 

 is, in regions having access to the true desert. Van Denburgh (1897, 

 p. 50) cites the occurrence of this form near Banning, although it 

 was not found there either in 1908 or 1912. With the addition of 

 the sandy wash of Vallevista as a new station to the previous records 

 of Cajon Pass, San Bernardino County, and Oak Springs, San Diego 

 County, three places are known where this lizard occurs west of the 

 mountain range. In none of these places does the lizard seem to be 

 abundant. From Oak Springs eight have been recorded, from Cajon 

 Pass two, while at Vallevista not over half a dozen were seen. In all 

 cases a fairly direct connection with the desert is possible, but these 

 stations are now isolated. These western examples are identical with 

 the eastern desert form. 



At Dos Palmos at half past six in the morning several of these 

 lizards were kicked out of the sand of the trail by the horses' hoofs. 

 At Whitewater in 1912 an interesting color change was noted in an 

 individual which was very light on the white sand but on coming under 

 the shade of a scraggly bush developed a gray pattern. 



Crotaphytus collaris baileyi Stejneger 

 Bailey Lizard 

 Distribution: Snow Creek, 1500-2000 feet, nos. 210-1; "Hall 

 Grade," 2000 feet, no. 1; Palm Canon, 800 feet, nos. 231, 243. 



This species is generally LTpper Sonoran or in the Grayia belt of 

 Lower Sonoran. In the San Jacinto area it is on the lower edge of 

 Upper Sonoran and in Palm Canon is found in Lower Sonoran. 

 The lizards were found inhabiting both rocky and sandy spots. 



