﻿10. UTA 209 



Uta tvrighti Schmidt, Amer. Mus. Novitates, No. 22, 1921, pp. 3, 6 

 (type locality, Grand Gulch, San Juan County, Utah, eleva- 

 tion between 4,000 and 5,000 feet). 



Description. — Head and body considerably depressed. 

 Snout rounded but rather narrow, with well-developed 

 canthi, above which the nostrils open much nearer to end 

 of snout than to orbits. Plates on head moderately large, 

 smooth and almost flat; interparietal largest. Frontal 

 plate usually divided transversely. Inner series of enlarged 

 supraoculars separated from frontal, frontoparietal and 

 parietal plates by one or two rows of granules. Superci- 

 liaries long, very slightly projecting laterally, and strongly 

 imbricate. Middle subocular very long, narrow, and 

 strongly keeled. Rostral very wide and moderately low. 

 Four to seven long low supralabials. Symphyseal plate 

 moderately large, followed by series of large plates in con- 

 tact with first pair of lower labials but separated from the 

 others by one or two rows of sublabials. Chin and gular 

 region covered with smooth subhexagonal granules, largest 

 centrally and becoming imbricate on the strong transverse 

 fold. Edge of fold with a series of projecting scales. 

 Ear-opening large, with a short anterior denticulation of 

 from two to five pointed scales of much variation in size 

 and shape. About two rows of medium-sized scales along 

 middle of back, bordered on each side by about two rows 

 of much larger strongly or feebly keeled or almost smooth 

 scales. Other dorsal scales very small except a row of 

 widely-separated enlarged tubercles on upper or dorsolateral 

 longitudinal dermal fold, where they often are but little 

 enlarged posteriorly and frequently are absent anteriorly. 

 Sometimes a few small tubercles on lower or lateral fold 

 and between the two folds. Tubercles on dorsolateral fold 

 of neck very short, if at all enlarged. Tail bearing whorls 



