12. SCELOPORUS 299 



Sceloporus undulatus undulatus COPE, Report U. S. Nat. Mus. for 1898, 



1900, p. 370 (part). 

 Sceloporus undulatus consobrinus COPE, Report U. S. Nat. Mus. for 1898, 



1900, p. 377 (part). 

 Sceloporus occidentalis occidentals CAMP, Univ. Cal. Publs. Zool., Vol. 



17, No. 7, 1916, p. 65; GRINNELL & CAMP, Univ. Cal. Publs. Zool., 



Vol. 17, No. 10, 1917, p. 159; STEJNEGER & BARBOUR, Check List 



N. Amer. Amph. Rept., 1917, p. 55. 



Description. Head and body little depressed. Nostril 

 opening much nearer to end of snout than to orbit. Upper 

 head-shields smooth, moderately large, and slightly convex} 

 interparietal much the largest. Frontal usually divided 

 transversely. Parietal, frontoparietal, and frontal plates 

 separated from enlarged supraoculars by a series of small 

 plates or granules. Superciliaries long, and strongly imbri- 

 cate. Middle subocular very long, narrow, and strongly 

 keeled. Rostral plate of moderate height, but great width. 

 Labials long, low, and nearly rectangular. Below lower 

 labials and behind large pentangular symphyseal, some 

 series of plates larger than gulars. Latter smooth, imbri- 

 cate, and usually emarginate posteriorly. Ear-opening 

 large, slightly oblique, with an anterior denticulation of 

 smooth, acuminate scales. Scales on back equal-sized, keeled, 

 pointed, and arranged in nearly parallel longitudinal rows. 

 Scales on sides similar to those on back, but smaller and 

 directed obliquely upward. No longitudinal dermal folds, 

 and no transverse fold on throat. Upper surfaces of limbs 

 provided with large, keeled scales. Posterior surface of 

 thigh covered with small, acuminate, keeled scales. Ventral 

 scales much smaller than dorsals, smooth, imbricate, and 

 usually bicuspid. Tail furnished with irregular whorls of 

 strongly keeled and pointed scales, much larger and rougher 

 above than below. Femoral pores varying in number from 

 thirteen to twenty on each thigh. Seven to twelve dorsal 



