12. SCELOPORUS 269 



BouLENGER, Proc. Zool. Soc. London, 1897, P- S'S! Cope, Report 

 U. S. Nat. Mus. for 1898, 1900, p. 401, fig. 68; Stejneger, Proc. 

 U. S. Nat. Mus., Vol. XXV, 1902, p. 150; Ditmars, Reptile Book, 

 1907, p. 140; Van Denburgh & Slevin, Proc. Cal. Acad. Sci., 

 Ser. 4, Vol. 3, 1913, p. 391; Stejneger & Barbour, Check List N. 

 Amer. Amph. Rept., 1917, p. 56. 

 Tropidokpis scalaris Gray, Griffith's Anim. King., Vol. IX, Syn., 1831, 

 p. 44; Gray, Zool. Beechey's Voyage, 1839, p. 95, pi. XXX, fig. 3; 

 DuMERiL & BiBRON, Erpetologic Generale, Vol. IV, 1837, p. 310; 

 Gray, Cat. Lizards Brit. Mus., 1845, p. 210; Dumeril, Cat. Meth. 

 Mus. Hist. Nat. Paris, 1851, p. 77. 



Description. — (Of Arizona specimens) Size small. Head 

 and body a little depressed. Nostrils opening upward, much 

 nearer to end of snout than to orbits. Upper head-shields 

 rather small and irregular, with numerous small ridges or 

 striations. Frontal usually divided transversely. Parietals 

 and frontoparietals quite small. Four or five enlarged 

 supraoculars, separated from frontal, frontoparietal and 

 parietal plates by a series of small plates. Superciliaries 

 long and strongly imbricate. Middle subocular very long, 

 narrow and strongly keeled. Rostral plate very wide and 

 low. Labials very long and low. Symphyseal large. Two 

 or three series of sublabials, the two or three plates behind 

 the symphyseal being largest. Gulars thin, smooth, im- 

 bricate, frequently emarginate posteriorly, a little smaller 

 than ventrals. Ear-opening large, with an anterior dentic- 

 ulation of two or three scales not much longer than those in 

 front of them. Dorsal scales equal-sized, strongly keeled, 

 mucronate, denticulate, strongly imbricate, a little larger 

 than ventrals, and arranged in parallel longitudinal rows. 

 Scales on sides similar to those on back, but those nearest 

 ventrals a little smaller, strongly keeled to the upper edge 

 of the orange zone, below this smooth like ventrals, all in 

 nearly straight longitudinal rows parallel with dorsal rows. 

 No longitudinal dermal folds, and no transverse fold on 



