LIZARD CNEMIDOPHORUS PERPLEXUS — MASLIN, ET AL. 341 



Of the remaining forms sexlineatus can also be removed from the list 

 on several counts. In this species there is never a median light line 

 as bright or as narrow as the lateral light lines; the third and fourth 

 supraocular scales are in contact with the frontoparietal; the posterior 

 antebrachial scales are definitely though not abruptly enlarged; there 

 are seldom more than 15-15 femoral pores; the intermandibular scales 

 are larger and abruptly demarked by a sudden decrease in size from 

 the small anterior gular scales; the gular fold is not notched, nor are 

 the enlarged gular fold scales interrupted medialh" b}^ a patch of smaller 

 scales; the enlarged gular fold scales are larger than the median inter- 

 mandibular scales. Furthermore, the species does not occur in the 

 vicinity of Santa Fe, N. Mex. There is no question of doubt that 

 sexlineatus and perplexus are not the same. 



The remaining species all occur in the vicinity of Santa Fe, and it 

 is these species which must be examined most critically. Of these 

 four species petylexus resembles sacki the least. In this latter form 

 there is no conspicuous median light stripe; the post-antebrachial 

 scales are abruptly and greatly enlarged; the intermandibular scales 

 are larger and abruptly demarked from the smaller anterior gular 

 scales along a transverse line; the gular fold is unnotched and bordered 

 by a row of enlarged, scutelike scales much larger than the median 

 intermandibular scales and uninterrupted by a triangular patch of 

 smaller scales. The paravertebral light stripes are separated by only 

 about five scales; the second and, particularly, third dark bands are 

 spotted by numerous light spots alternating from side to side of each 

 band; the fourth and lowest band also contains numerous light spots. 



C. inornatus of New Mexico and Arizona differs from perplexus in 

 that it lacks spots in the dark fields; has about eight scales between 

 the paravertebral light stripes; is much smaller than the type; has 

 larger post-antebrachial scales; the intermandibular scales are much 

 larger, relatively few in number, and abruptly differentiated from the 

 smaller anterior gular scales by one or two transverse rows of still 

 smaller, granular, median scales; the gular fold is unnotched and the 

 enlarged scales of the fold are larger than the median intermandibular 

 scales; there is no patch of smaller scales interrupting the row of 

 enlarged gular fold scales; temporal scales larger and fewer in number; 

 femoral pores fewer. 



In spite of the conspicuous differences in scale counts and size, 

 C. inornatus in the northwestern part of its range and C. velox resemble 

 each more than they resemble any other species of Cnemidophorus. 

 Lowe (1955) has discussed the relationship of these two species in a 

 study demonstrating the validity of C. velox. Wlule he did not em- 

 phasize the fact that velox and inornatus are nowhere known to be 

 sympatric, he pointed out that they exhibit a marked difference in 



