18. CNEMIDOPHORUS 523 



ard in Los Angeles County: "The whip-tailed lizard is 

 frequently seen during the months of June, July, and 

 August on the gravelly washes along the bases of the moun- 

 tains. It is fairly numerous in the Arroyo Seco, Tujunga, 

 and San Gabriel washes, and occurs also on the hot south 

 slopes well up into the mountain ranges. We have seen it 

 in August on the hot ridge above Switzer's Camp, at about 

 3,500 feet elevation. 



"Close around Pasadena the whip-tail lizard is now much 

 less often seen than formerly. It used to occur about Devil's 

 Gate in the same sort of region that the road-runner and 

 cactus wren like. All these native inhabitants are becoming 

 scarce as the region settles up, and hunters persecute its wild 

 population more persistently. 



"On July 9, 1894, a road runner was secured whose 

 stomach contained four full-sized whip-tail lizards. This 

 establishes the identity of one natural enemy. 



"The color of the whip-tail lizard causes it to blend 

 intimately with its surroundings so that by movement alone 

 does it commonly betray its presence. It has a peculiar 

 slinking, hesitating gait ordinarily 5 but when thoroughly 

 alarmed runs at a prodigious speed, faster by far than any of 

 our lizards. We have never known the whip-tail to climb 

 trees or bushes, or even rocks. It is an inhabitant of the 

 hot, level sands." 



1 1 0. Cnemidophorus bartolomas Dickerson 

 SAN BARTOLOME WHIPTAIL LIZARD 



Cnemidophorus bartolomas DICKERSON, Bull. Amer. Mus. Nat. Hist., 

 Vol. XLI, 1919, p. 476 (type locality, San Bartolome Bay, Lower 

 California, Mexico); NELSON, Mem. Nat. Acad. Sci., Vol. XVI, 

 1921, pp. 114, 126, 171. 



Description. Body long, with a very slender tail and 

 very long legs. Nostrils opening in large anterior nasal 



