The Striped Lizards or " Race Runners " 



row of yellow dots appears on each dark area between the stripes; 

 these spots finally fuse across the dark area and into the lines, 

 entirely breaking up the striped pattern and bringing about an 

 effect of wavy and narrow, yellow cross-bands, alternating with 

 dark ones; as the alternate light and dark patches are fine and 

 irregular, the eifect is a marbled or tessellated pattern hence 

 the technical name. 



Variations. Five varieties have been described, these re- 

 lating to colouration. They appear to represent different stages 

 in the colour metamorphosis, only. In some portions of the 

 range the process seems to be incomplete; in others it continues 

 to an extreme degree and the change from a striped example 

 to one with a marbled pattern, is striking. 



Dimensions. Total Length 18 inches. 



Length of Tail 12 



Width of Head i 



Length of Head i i 



Length of Hind Limb }f 



' Front 2 



Distribution. Northern Mexico and southwestern Texas; 

 New Mexico, Arizona, Nevada, Utah, eastern California and 

 Lower California. Occurs most commonly in sub-arid regions 

 and in the deserts. 



Graham's Lizard; Tiger Lizard, Cnemidophorus grdhami, 

 (B. & G.). Differs from the tessellated lizard in the much coarser, 

 light and dark markings. The limbs are vividly blotched. 



Grows to a length of fourteen inches. 



Distribution. Apparently a rare lizard. Several examples 

 have been taken in Texas, between Antonio and El Paso. A 

 variety is recorded from Lower California. 



The Spotted Race Runner, Cnemidophorus gularis, (B. &G.). 

 Closely allied to the succeeding species, but each of the dark 

 spaces between the stripes contains a row of pale dots or blotches 

 on the adult; these dots do not encroach upon the stripes as is 

 the case of the two preceding reptiles. 



Snout considerably more pointed than that of the near 

 ally C. sexlineatus. 



Colouration. Brown, or olive, with six sharply defined 

 yellow stripes; these are persistent through life. Young individ- 

 uals are simply striped; as they grow older, a row of pale dots 



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