76 UNIVERSITY OF COLORADO STUDIES 



lar, but not prominent. Infralabials increasing regularly in size to the posterior, 

 which are not very prominent. Gular scales equal. A strong prehumeral fold, in 

 front of which is a fossa, and in front of this a semicircular fold convex backward 



with a few larger tubercles on its border In life the color of this species is 



a light yellowish brown, sometimes with a shade of pink. A blackish spot begins 

 on each side of the nape and extends round to a point anterior to the humerus. 

 There is sometimes a sooty shade on each side from the middle to the groin, A 

 small blackish spot behind the vent on the middle line, and frequently a sunilar 

 spot on each side of the anterior border of the vent. There are no dorsal spots or 

 cross bars, but the tail is indistinctly annulate with blackish. Under surface 

 pale yellowish, immaculate, except the gular region, which is generally indis- 

 tinctly dusky spotted.— Rept. U.S.N.M., pp. 437 and 438, 1898. 



Family Teiidae 



The Striped Lizards 



This family of lizards, which contains a fairly large number of 

 species, is found only in the New World. Only a single genus is found 

 in the United States, Cnemidophorus. 



Genus CNEMIDOPHORUS Wagler 

 Cnemidophorus Wagler, Syst. Amph., p. 154, 1830. 



Dorsal scales rather small, ventrals large; gular fold present, 

 double; head plates large and regular; ear openings exposed ; femoral 

 pores present; scaled portion of the tongue heart-shaped or V-shaped 

 posteriorly; body elongate; size medium, length up to twenty inches, 

 of which the small, elongate tail makes up over half; range. United 

 States generally, south into South America. Three species have been 

 taken in Colorado. 



a. Under part of the throat with a band of scales distinctly and abruptly 

 larger than the adjoining scales. 



b. Femoral pores, 15 to 17; posterior margin of the frontal plate just 

 reaching the junction of the second and third supraocular plates, so that 

 the suture between second and third supraocular plates appears con- 

 tinuous with that separating the frontal and fronto-parietal plates; head 

 tapering rather uniformly to the snout; no large, post-antebrachial 



plates; size small C. sexlineatus (Linnaeus). 



bb. Femoral pores, 18 to 25; posterior margin of the frontal plate passing 

 the junction of the second and third supraocular plates; head rather 



