274 3. IGUANIDJE 



Vol. 48, 1915, p. 419 (part); RUTHVEN & GAIGE, Occas. Papers 

 Mus. Zool. Univ. Mich., No. 8, 1915, p. 21, pi. V, fig. i; VAN DEN- 

 BURGH & SLEVIN, Proc. Cal. Acad. Sci., Ser. 4, Vol. 5, No. 4, 1915, 

 pp. 100, 104, pi. 12, fig. 2; RUTHVEN, Bull. Amer. Geograph. Soc., 

 Vol. XLVII, 1915, pp. 950, 951; ELLIS & HENDERSON, Univ. Colo- 

 rado Bull., Vol. XV, No. 6, 1915, p. 260. 



Sceloporus gratiosus YARROW, Surv. W. looth Merid., Vol. V, 1875, P* 

 576; COUES, Surv. W. looth Merid., Vol. V, 1875, p. 596 (part); 

 BOULENGER, Cat. Lizards Brit. Mus., Vol. II, 1885, p. 230 (part); 

 BOULENGER, Proc. Zool. Soc. London, 1897, P- 57 (part); HERRICK, 

 TERRY & HERRICK, Bull. Sci. Lab. Denison Univ., Vol. XI, 1899, 

 p. 130; HERRICK, TERRY & HERRICK, Bull. Univ. New Mexico, 

 Vol. I, 1899, p. 130. 



Sceloporus gracilis YARROW, Surv. W. looth Merid., Vol. V, 1875, p. 



57 6. 



? Sceloporus consobrinus COPE, Ann. Rep. U. S. Geol. Surv. Terrs., 

 1871 (1872), p. 468; YARROW, Surv. W. looth Merid., Vol. V, 

 *875, p. 574 (part); YARROW, Bull. U. S. Nat. Mus., No. 24, 1883, 

 p. 61 (part); COPE, Proc. Acad. Nat. Sci. Phila., 1883, pp. 15, 16. 



Sceloporus consobrinus gratiosus YARROW, Bull. U. S. Nat. Mus., No. 

 24, 1883, p. 62 (part). 



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

 1898, 1900, p. 377 (part). 



Sceloporus graciosus graciosus STEJNEGER & BARBOUR, Check List N. 

 Amer. Amph. Rept., 1917, p. 54 (part); VAN DENBURGH & SLEVIN, 

 Proc. Cal. Acad. Sci., Ser. 4, Vol. XI, 1921, pp. 28, 33, 40, 43; PACK, 

 Proc. Biol. Soc. Washington, Vol. 34, 1921, p. 63. 



Description. Head and body somewhat depressed. 

 Nostrils opening nearer to end of snout than to orbits. Up- 

 per head-shields moderately large, smooth and slightly con- 

 vex; interparietal largest. Frontal usually divided trans- 

 versely. Parietal, frontoparietal, and frontal plates sep- 

 arated from enlarged supraoculars by a series of small plates 

 or granules. Superciliaries long, wide and strongly im- 

 bricate. 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 



