1913] Atstilt: Reptiles of the San Jacinto Area 39 



All are typical, having keeled temporal, arm, and forearm .-rales 

 and keeled ridges in the fifth or sixth scale from the mid-ventral 

 row behind the aims. 



In characteristics observed these lizards were like the rest of the 

 genus. They are fond of shelter, such as thick ferns along the bottom 

 of a gulch, in a grapevine under a Cottonwood tree, in oak brush, under 

 a lilac bush, or in a rose tangle. Although usually slow of movement 

 when under no fear, after they are captured they will fight, biting a 

 stick and even themselves. Occasionally they climb into hushes in 

 efforts to escape pursuit. 



Cnemidophorus stejnegeri Van Denburgh 

 Stejneger Whip-tailed Lizard 



Distribution: Snow Creek, 1500 feet, nos. 84-6, 15-4, 156-9, 213-6, 

 no. # 18; Cabezon, 1700-2000 feet, nos. 5, 6, 131-2, 148, 168, 172-3, 

 191, 198, nos. *l-4, 7, 12; Banning, 2200 feet, nos. 7, 95-6, 155; Pop- 

 pet Flat, 3700-4500 feet, nos. 268, 349-50, nos. *34, 3S ; Hemet Lake, 

 4400 feet, no. 516; Vallevista, 1800 feet, no. 497; Asbestos Spring, 

 3500 feet. no. 247 ; Dos Palmos Spring, 3500 feet, nos. 230, 246, 369, 

 485-7 ; Palm Canon, 800 feet, no. 245. At Deep Canon a few individ- 

 uals were noted. This species ranges in Upper and Lower Sonoran. 



One of the distinctions between C. tigris and G. stejnegeri is based 

 on scalation, on the relative size of dorsal granules and the relative 

 size of central gular and collar scales. Since these appear to vary 

 with age, comparison has to be made on specimens accurately agreeing 

 in size, as there is no structural criterion of age or relative develop- 

 ment. Under such circumstances within any given group of material 

 of either species one finds variation in relative proportions — such wide 

 variations as to make the specific determination extremely difficult. 

 The other distinction is based on the gray suffusion and the clearness 

 of pattern on sides of head, neck, and gular region. C. tigris from 

 Nevada in the Museum collection presents both distinct and indistinct 

 markings on the sides of the head, while the specimens from Mecca, 

 California, have distinct markings and those from Colorado River 

 have generally indistinct markings. C. stejnegeri from the Pacific 

 slope has almost no gray suffusion, but specimens from regions bor- 

 dering on the desert show some gray suffusion. No. *18 taken at 

 Whitewater in 1912 has the flatter and smaller gular scales charac- 

 teristic of C. tigris, but it has also the slight gray suffusion, distinct 

 black markings on the sides of the head, and very evident cross-band 



