340 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io3 



scales, these preceded by a few smaller granules. Scales of central 

 intermandibular area slightly larger than adjacent scales, inter- 

 mandibidar scales gradually decreasing in size posteriorly; anterior 

 gular scales about half diameter of lateral intermandibular scales; 

 gular fold with medial, anteriorly directed open notch; fold bordered 

 by small scales, medially small scales form a triangle, apex forward, 

 anterior to notch, this triangle separating two patches of enlarged 

 scales; these enlarged gular scales smaller than enlarged median 

 intermandibular scales. Anterodorsal brachial scutes in four rows; 

 anterodorsal antebrachial scutes in three rows; post-antebrachial 

 scales small with central strip of very slightly enlarged scales; antero- 

 dorsal femoral scutes in seven rows; anterodorsal tibial scutes in three 

 rows. Three enlarged anal plates consisting of a pair separated from 

 cloaca by four rows of small scales and preceded by an enlarged 

 median scale. Femoral pores 19-19, median two separated by four 

 scales. There are 178 vertebral scales counting from but not including 

 enlarged occipitals to first row of enlarged scales at base of tail; 73 

 scale rows at region of greatest girth excluding ventral plates; 25 

 scales around base of tail. 



Color pattern. Median vertebral light stripe as distinct and as 

 wide as paravertebral light stripes, commencing as a pair of light 

 spots on occipital scales, extending posteriorly to firet row of enlarged 

 scales of tail, posterior three-fifths of line undulant or wavy; width 

 of vertebral light stripe, paravertebral dark and light stripes about 

 equal; paravertebral light stripes separated by 12 rows of scales 

 (average of 10 counts) at midbody; paravertebral (first) dark stripes 

 or fields darker than remaining ones; toward center of body vague 

 indication of one or two light spots in these dark fields; second, third 

 and fourth dark stripes successively wider, fourth stripe more than 

 twice as wide as any light stripe which are all subequal in width. 

 Second and third dark stripes each with a very vague indistinct 

 median row of large light spots, somewhat confluent, difficult to 

 count, approximately 12 or 13 spots in each field. Fourth dark 

 stripes with one or two extremely vague, large, diffuse, light spots. 

 Ventrum immaculate white. 



Comparisons: With this description in mind the type can now be 

 compared with the species of Cnemidophorus that Gambel might have 

 encountered from Missouri to California. These species are as fol- 

 lows: tesselatus, tigris, sexlineatus, inornatus, neomexicanus, velox, sacki, 

 and hyperythrus. The tesselated forms tesselatus and tigris may be 

 dropped from the list immediately on the basis of color pattern 

 alone. The species hyperythrus occasionally has a median light stripe 

 but it has only a single frontoparietal scale and its distribution is 

 such that it is the least likelv to have been encountered bv Gambel. 



