REPTILES FROM So. CALIF. AND L. CALIF. MEEK 13 



Family AimiellicUe. 



Anniella pulchra Gray. SILVERY FOOTLESS LIZARD. 



One specimen of this species was taken at San Salado Canon and 

 one at San Jose in Lower California. 



Family Xantusiidse. 



Xantusia vigilis Baird. DESERT NIGHT LIZARD. 



"This species is found beneath the prostrate limbs of the yucca 

 tree (Yucca arborescens) in the Mojave Valley. In Lower California, 

 at San Matias Pass, it inhabits the fallen trunks of a smaller yucca 

 tree. This species was also observed beneath the prostrate limbs of 

 tree yuccas in the Antelope Valley, and at Piru Creek about the tree 

 yuccas on the east slope of the Inyo Mountains." 



Specimens were secured at Lanes Mill, Piru Creek, Neenach, and 

 Mojave, California. 



Family Teiidse. 



Cnemidophorus tigris Baird & Girard. DESERT WHIPTAIL. 



This species is very abundant in the southeastern part of Cali- 

 fornia. "It is found on the desert and on the mountain sides to the 

 lower edge of the Pinon zone." Individuals of this species living in 

 sandy regions are much lighter in color than those living in the 

 mountains. The under surface of the light-colored ones is nearly 

 white, no spots on the chin, and the black or dark blue of the belly 

 being in blotches on its anterior half. The under surface of some of 

 the darker specimens is nearly a uniform blue, with scarcely any 

 trace of spots. All grades are found between these two extremes. 

 The color of the dorsal region varies greatly. On the young are six 

 longitudinal white lines, later white spots form between these lines. 

 These spots increase in size until they extend to the light lines, and 

 thus are formed irregular, narrow, dark cross bars, the lines becoming 

 later quite or entirely obliterated. Most of the species of this genus 

 undergo a similar change. The result is that species have been 

 unduly multiplied. Professor Cope noted this change in color pattern 



