REPTILES FROM SOUTHEASTERN ARIZONA. 343 



contact with first supralabial plate. Thirty -one of these 

 have only two large anals, while forty- eight have three 

 arranged in the usual triangular form — one in front of 

 two. 



In C. gularis the whitish longitudinal lines which orig- 

 inate at the parietal plates are much closer together than 

 in C . sexlineatus, the distance between them being rather 

 less than that between any other two of the longitudinal 

 lines in C . gularis, while it is nearly twice this distance 

 in C. sexlineatus. The light vertebral band or pair of 

 lines seen in C. sexlineatus is normally absent from C. 

 gularis, but one young specimen shows a faint, narrow 

 median line. 



Young specimens have six longitudinal lines on a dark 

 brown ground without light spots. The two of these 

 lines nearest to the middle of the back are usually slightly 

 narrower and less distinct than the others. In older spec- 

 imens the ground-color becomes a little lighter in places, 

 presenting a faintly mottled appearance. In still larger 

 specimens small whitish spots appear between the lines 

 (first on the posterior part of the back), and in the largest 

 individuals these become more numerous and sometimes 

 join the longitudinal lines. The latter, however, never 

 lose their distinctness, although they become somewhat 

 broader with age. Different individuals of the same size 

 show much variation in the extent to which these mark- 

 ings have been developed, but their presence is clearly 

 due to increased age, and not to either sex or season. 



These lizards were collected near Fort Lowell and in 

 Rucker Canon. 



Cnemidophorus scalaris (Cope). 



Two specimens agree very well with the description 

 and figures given by Prof. Cope (Trans. Am. Philos. 

 Soc, xvii, pt. 1). They are much larger than C. gularis. 



