122 CALIFORNIA ACADEMY OF SCIENCES. 



agonal granules which are slightly larger than those on 

 the back and sides. 



The color above is dark brownish clay, dotted with 

 black on single granules. A pale yellowish line, two 

 granules wide, runs posteriorly from each occipital plate, 

 but is soon lost on the back to reappear over the thigh. 



Length to vent (about) 39 mm. Tail (about) 38 mm. 

 Hind limb 14 mm. Fore limb 10 mm. Diameter of eye 

 i-j- mm. Shielded part of head 8}4 mm. Head to pos- 

 terior edge of ear 8^ mm. Head to anterior gular fold 

 7^ mm. Head to posterior edge of anterior fold 11 34^ 

 mm. Head to posterior edge of posterior fold 12^ mm. 



The single specimen of A\ gilberti has been compared 

 with one hundred and forty -four of X. vigilis without 

 any approach to its distinctive characters having been 

 found. It is of great interest, for it extends the known 

 range of the genus Xantusia several hundred miles to the 

 southward, introducing it for the first time into Mexican 

 territory, and affording another link between the "Cape 

 Region" and the Sonoran Subprovince. 



It gives me great pleasure to name this interesting liz- 

 ard in honor of Dr. Charles H. Gilbert, to whom my in- 

 terest in herpetology is entirely due. 



Cnemidophorus maximus Cope. 



Gnemidophorus maximus. 



1863, Cope, Proc. Ac. Nat. Sci. Phila., p. 104. 

 (1866, Cope, Proc. Ac. Nat. Sci. Phila., p. 312.) 

 (1875, Cope, Bull. U. S. Nat. Mus., No. 1, pp. 45, 93.) 

 (1880, Lockington, Am. Nat., xiv, 4, p. 295.) 

 1883, Yarrow, Bull. U. S. Nat. Mus., No. 24, pp. 42, 188. 

 (1884, S. Garman, Bull. Essex Inst., xvi, 1, p. 13.) 

 (1885, Boulenger, Cat. Lizards Brit. Mus., ii, p. 369.) 

 (1887, Cope, Bull. U. S. Nat.' Mus., No. 32, p. 45.) 

 (1887, Belding, West Am. Scientist, iii, 24, p. 97.) 

 1892, Cope, Trans. Am. Philos. Soc, xvii, 1, p. .32. 



Description of No. 8j^. — The nostrils are pierced in 

 the large anterior nasal plates, which are in contact on 



