74 CALIFORNIA ACADEMY OF SCIENCES. 



c 2 . Males with one blue patch on center of throat; usually larger. 



S. biseriatus. p. 80. 



a 2 . Parietal and frontoparietal plates in contact with enlarged supraocu- 

 lars; scales on back of thigh not smaller than those in front of anus, 

 d. A strongly contrasted black blotch or collar in front of shoulder; 

 dorsal scales distinctly keeled, with long points. 



S. magister. p. 84. 



d 2 . No distinct black blotch or collar in front of shoulder; dorsal 

 scales less distinctly keeled, or smooth, with short points. 



S. orcutti. p. 86. 



18. Sceloporus graciosus Baird & Girard. MOUNTAIN 

 LIZARD. 



Sceloporus graciosus, B. & G., Proc. Acad. Nat. Sci. Phila., VI, 1852, 



p. 69 (type locality Valley of Great Salt Lake, Utah); and 



Stansbury's Kept. Exped. Gt. Salt Lake, 1853, p. 346, pi. V, 



figs. 1-3. 

 Sceloporus gracilis, BAIRD & GIRARD, Proc. Acad. Nat. Sci. Phila., 



VI, 1852, p. 175 (type locality Oregon); and GIRARD, U. S. 



Explor. Exped., Herp., p. 386, pi. 20, figs. 1-9. 

 Sceloporus vandenburgianus, COPE, Am. Nat., XXX, 358, Oct. 1896, 



p. 834 (type locality Summit of Coast Range, San Diego 



Co., Oal.). 



Description. Head and body somewhat flattened. 

 Nostrils opening much nearer to end of snout than to 

 orbits. Upper head-shields smooth, moderately large, 

 and slightly convex; interparietal largest. Frontal 

 usually divided transversely. Parietal, frontoparietal, 

 and frontal plates separated from enlarged supraoculars 

 by a series of small plates or granules. Superciliaries 

 long, wide, and strongly imbricate. Middle subocular 

 very long, narrow, and strongly keeled. Rostral plate 

 very wide and rather high. Labials long, low, and 

 almost rectangular. Below lower labials, some series of 

 large sublabial plates. Symphyseal large and pentan- 

 gular. Gulars small, smooth, imbricate, frequently 

 emarginate posteriorly, about size of ventrals. Ear- 

 opening large, slightly oblique, with an anterior dentic- 



