268 3. IGUANIDJE 



hhh\ — Adult males with upper surfaces more 

 yellowish especially on hind limbs and 

 base of tail 5 black patch in front of 

 shoulder with a distinct light borderj 

 median portion of belly usually white 5 

 chin and anterior gular region usually 

 whitish. 



S. zosteromus. — p. 348. 



eeee'. — Scales of anterior ear denticulation shorter 

 and less acuminate usually not extending en- 

 tirely across ear-opening; coloration largely 

 bluish or grayish above, in adult males. 

 S. clarkii.— p. 359. 



ddd'. — Scales smaller, 32 to 37 between interparietal 

 and base of tail; adult males dark, middorsal 

 region purple or bronze. 



S. Hcki.— p. 3 56. 

 cc'. — No or a less distinct black blotch or collar in front 

 of shoulder dorsal scales less distinctly keeled, or 

 smooth, with short points. 



S. orcutti.— p. 352. 



54. Sceloporus scalaris Wiegmann 



Orange-sided Swift 



Plate 19 



Sceloporus scalaris Wiegmann, Isis, 1828, p. 370 (type locality, Mexico); 

 Wiegmann, Herpetol. Mex., 1834, p. 50, pi. VIII, fig. 2; Fitzin- 

 GER, Syst. Rept., 1843, p. 75; Baird, U. S. Mex. Bound. Surv., 

 Vol. II, Rept. 1859, p. 6; Bocourt, Miss. Sci. Mex., Rept., 1874, 

 p. 202, pi. XVIII bis, fig. 9-9b; Cope, Bull. U. S. Nat. Mus., No. 1, 

 1875, p. 49; CouES, Surv. W. 100th Merid., Vol. V, 1875, p. 595; 

 Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, p. 62; Cope, Proc. 

 Amer. Philos. Soc, Vol. XXII, 1885, p. 394; Boulenger, Cat. 

 Lizards Brit. Mus., Vol. II, 1885, p. 234; Duces, La Naturaleza, 

 Ser. 2, Vol. I, 1887, p. Ill; Cope, Bull. U. S. Nat. Mus., No. 32, 

 1887, p. 36; Gunther, Biologia Centrali-Americana, Rept., 1890, 

 p. 73; Van Denburgh, Proc. Cal. Acad. Sci., Ser. 2, Vol. 6, 1896, 

 p. 341; 



