36 A SYNOPSIS OF THE SPECIES OP 



pores on each side. The length of the head and body is 85 mm. ; in No. 8633 it is 

 100 mm. 



Hallowell, in describing this subspecies as C undulatus^ recognized the differ- 

 ence between it and the C. t perplexus, remarking that the present form has but two 

 light stripes on each side. 



This form ranges the Sonoran and Lower Californian regions to Utah, inclusive, 

 and extends to the northern part of California. 



CnemidopJiorus tessellatus melanosteilms Cope. 



Check List Batr. Rept. N. Amer., 1875, p. 46. 



Cnemidophorus melanostethus Cope, Proceeds. Acad. Phila., 1863, p. 104. 



The coloration of this subspecies is something like that of the C. vanoloszis, but 

 that is another species. The interparietal plate is narrower than in the C. t tessel- 

 lattcSy and the black breast and gular region are not seen in it. 



A number of young specimens accompany the two adults described. They have 

 two narrow stripes on each side of the middle line, and the spaces between them con- 

 tain each a row of pale spots. The thorax is not black. These resemble the young 

 of C. t tessellatus (C. gracilis), but the latter has brighter colors, and where the 

 spaces between the stripes contain marks there are delicate longitudinal lines (No. 

 3034, type of C. gracilis). 



This form is only known from the Colorado river of Arizona. 



A form very much like this subspecies has been named C. martyris by Stejne- 

 ger.* The two known specimens differ from the C. t melanostethus in their smaller 

 size and in the extension of the bl ack over the entire inferior surface. It is doubtful 

 whether it can be regarded as a subspecies. It is from the Island of San Martir, 

 Gulf of California. 



Cnemidophorus tessellatus ruhidus Cope. 



This elegant form is represented in the l^ational collection by seven individuals, 

 of which three are adult. To the usual characters of the species it adds some others. 

 Thus the scales are rather finer, being less than .5 mm. in diameter. The femoral 

 scales are more numerous. Femoral pores twenty-two. Small scales of collar bor- 

 der not granular. 



There are three parietals, and the longest toe reaches the auricular meatus. 

 There are the usual three anals, with one in front of the median, which is, with the 

 latter, bounded by a few scales on the sides. Median gular scales rather coarse. 



* Proceeds. U. S. Nat. Museum, XIV, 1890, p. 407. 



