408 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



Habits. — CrotapJiytus wislizenii was found on the desert among low 

 growths of Artemisia tridentata and other shrubs. Its food consisted 

 to some extent of other lizards, for a whole Cnemidopliorus tigris, the 

 tail of another, and a Uta stansburiana were found in the stomachs 

 examined. 



Two females taken at the Pyramid Lake Indian Agency between 

 May 26 and June 1 contained two and four eggs, respectively. One 

 secured at Derby on June 29 carried two well-developed eggs, and 

 another taken at Carson City on July 10 contained large eggs and had 

 assumed the brilliant red-orange breeding colors. 



CALLISAURUS VENTRALIS MYURUS, new subspecies. 



Diagnosis. — Resembles Callisaurus ventralis (Hallowell), to which 

 it is closely allied, but has a higher ratio between body and tail 

 length, fewer femoral pores, and averages darker in dorsal coloration. 



Type-specimen. — No. 51786 U.S.N .M. From Pyramid Lake Indian 

 Agency, Washoe County, Nevada, June 2, 1911. Collectors, J. O. 

 Snyder and C. H. Richardson. 



Description of type. — Head about as long as wide, covered with 

 small flat or slightly rounded plates of which the interparietal is the 

 largest; nostrils surrounded by a series of small plates, smallest on 

 the posterior margin; plates of prefrontal region larger than those to 

 either side of it; supraocular regions 8 scales wide, separated by a 

 single row of scales smaller than those of adjoining prefrontal region; 

 anterior superciliary largest, followed by 4 scales on one side of the 

 head and 5 on the other; eyelids fringed with small scales, those on 

 the lower lid larger and more acutely pointed than those on the upper; 

 supralabials imbricate and prominent; infralabials smaller than 

 supralabials, flat and not imbricate; a row of scales below infralabials 

 separated by two shorter rows posteriorly; gular granules larger 

 than anterior dorsals, imbricate and largest on posterior gular fold. 

 Dorsum covered with slightly rounded granules, gradually increasing 

 in size from head to base of tail and decreasing laterally from the 

 median dorsal region; number of dorsal granules in a head length 

 posterior from interparietal plate, 47 ; anterior from a point on dorsum 

 opposite anus, 39; scales on tail imbricate, keeled dorsally for the 

 greater part of the distal four-fifths of its length; several rows of 

 weakly spinose scales occupy the distal four-fifths of its lateral 

 margins. Femoral pores 14 and 15. 



Color in alcohol: Snout olive, gradually blending into dark blue- 

 gray on dorsum. Dorsum spotted with white; on its median region 

 are two parallel rows of dull black spots which gradually increase in 

 size and intensity from the head to the base of the tail, where they 



