58 CALIFORNIA ACADEMY OF SCIENCES. 



between each pair of light cross-lines. The whole 

 coloration becomes paler, as if faded, and the pattern 

 less distinct. Usually the light cross-lines fade first, 

 leaving the spots fairly distinct, but the reverse order of 

 disappearance may occur. In some very old specimens 

 the cross-lines have entirely vanished and the brown 

 spots have become very minute. There is also a good 

 deal of purely individual color variation. 



During the breeding season some females have the 

 under surfaces and sides of the tail and body suffused 

 with deep salmon or salmon-red. This color disappears 

 in alcohol. 



Length to auus 47 69 87 89 107 119 



Length of tail 77 160 175 204 225 



Suont to orbit 4 6 8 8 10 12 



Nostril to ear 10 14 18 18 21 25 



Width of head 9 12 16 16 19 22 



Fore limb 19 28 34 34 43 46 



Hind limb 32 54 69 74 80 87 



Base of tifth to end of fourth toe 13 21 27 30 30 33 



Distribution. — The Leopard Lizard occupies almost 

 the entire desert region of eastern California, ranging 

 from San Diego County across the Colorado and Mojave 

 Deserts to the smaller desert valleys of the Great Basin, 

 where it is quite common in Liyo County. Through 

 Walker Pass, it reaches the western slope of the Sierra 

 Nevada, where it occurs in Kern Valley. It has been 

 collected also at San Jacinto on the western slope of the 

 Coast Range of Riverside County. At Mojave Station, 

 Kern County, this lizard is rather rare, but at Needles, 

 San Bernardino County, it may readily be found on the 

 sand banks of the Colorado River. It ranges across 

 Nevada (Pyramid Lake, Panaca, Vegas Valley, Mt. 

 Magruder, Quartz Spring, Amargosa Desert, Sarcobatus 

 Flat, Charleston Mts., Grapevine Mts., Timpahute Mts., 



