672 Bulletin American Museum of Natural History [Vol. XLVI 



A specimen in the Biological Survey collection comes from San 

 Felipe Bay (U. S. N. M. No. 37679). 



Xantusia gilberti Van Denburgh 

 Xantusia gilberti Van Denburgh, 1895, p. 121, PI. xi; Stejneger and Barbour, 



1917, p. 64. 



Range. — Southern Lower California. 



Lower Californi an Records. — San Francisquito, Sierra Laguna, Van Den- 

 burgh, 1895, p. 121. 



A specimen in the Biological Survey collection comes from 

 Laguna, Sierra Laguna (U. S. N. M. No. 37680). This specimen is of 

 great interest, proving that X. gilberti is very closely related to vigilis 

 and that some of the distinctive characters of the type were abnormal. 

 In the type, the frontal is divided, and in contact with the interfronto- 

 nasal. In the present specimen, the head shields are disposed exactly 

 as in vigilis, the prefrontals meeting in the mid-line in front of the single 

 frontal. The head shields differ from those of vigilis, however, in being 

 flatter and smoother. The head is smaller, the nose more pointed, and 

 the eye smaller. In addition to the smallness of the eye, this specimen 

 agrees with X. gilberti in the disposition of the postmentals, the second 

 pair being separated by a narrow scale, as figured by Van Denburgh 

 (1895, PI. xi, fig. D). In vigilis, this median scale is much broader. 

 There is no question, therefore, of the validity of gilberti, though its 

 diagnosis must be changed. 



In two specimens of vigilis from Lane's Mill, California, collected by 

 Heller in 1903 and preserved in the Field Museum of Natural History, 

 the frontal is completely divided, as in the type of gilberti. In another 

 specimen in the same series the frontal is in contact with the interparietal. 

 The back of the present specimen of gilberti is nearly uniform brown, 

 with scarcely any of the darker brown maculation of vigilis. 



Key to Distinguish the Species of Xantusia in Lower California 

 Second pair of postmentals widely separated; eye larger; back maculate or lineolate 



with dark brown spots. . ." X. vigilis. 



Second pair of postmentals narrowly separated; eye smaller; back nearly uniform 



in color X. gilberti. 



Cnemidophorus tessellatus tessellatus (Say) 



Ameira tessellata Say, 1823, p. 50. 



Cnemidophorus tessellatus tessellatus Stejneger and Barbour, 1917, p. 67. 



Range. — Texas to California, the Great Basin; entering northeastern Lower 

 California. 



Lower Cai.iforman Records. — San Felipe, Meek, 1905, p. 14. 



