isai.] «^^y [Cope. 



cies does not occur in half the iadivicluals. On the other hand, the wide 

 supraocular plates are never divided. 



Subspecies smaragdinus Cope, Report U. S. Expl. Surv. W. of 100th 

 meridian. G. M. Wheeler, Vol. v, Zoology, p. 573, pi. xxiv, fig. 2. 



Differs considerably from the typical *5. undulatus in color, being either 

 green above, or brown with large green spots transversely arranged. 



Great Basin ; Utah, Nevada and Oregon, Nemerry, Heashaw, Cope. 



SCELOPORUS sprNOsus Wiegmann, Isis, 1828, p. 369 ; Tropidums spinosus, 

 Wagler, Syst. Amph., 1830, p. 146 ; Tropidolepis spinosus, Gray, 

 Synops. Kept, in Griffith's Anim. Kingd. t. ix, 1831, p. 43 ; Sceloporus 

 spinosus, Wiegmann, Herp. Mex. pars 1, 1834, p. 50, tab. vii, fig. 3; 

 Tropidolepis spinosus, Dumer. et Bibron, Erp. Gen. t. iv, 1837, p. 304 ; 

 Sceloporus spinosus, Fitzinger, Syst. Rept., 1843, p. 75 ; Tropidolepis 

 spinosus, Gray, Cat. Liz., Brit. Mus., 1845, p. 209 ; Aug. Dumdril, Cat. 

 meth. coll. Rept., 1851, p. 77 ; Sceloporus spinosus, Boucourt, Miss. 

 Sci. du Mexique. iii, Rept. p. 174, pi. xviii, fig. 2, 2a, 26. 

 Guanajuato, Duges. 

 The >S'. spinosus approaches ilie S. undulatus very closely, differing 



principally in size and in color, and the smaller number of femoral pores. 



A Texan form appears to connect the two. 



Sceloporus zosteromus Cope, Proceeds. Acad. Phila., 1863, p. 105. S. 

 clnrki subsp. zosteromus Cope, Check-list, 1875, p. 49. 

 Lower California, Xantus, Belding ; Southern Arizona. 

 Sceloporus melanorhinus Bocourt, Ann. des Sciences NaturelleSj iii, 

 1876, p. 85. 

 Tehuantepec, Sumiclirast ; Colima, Xantus. 



Sceloporus t^niocnemis, sp. nov. 



Scales of the back in nearly parallel series, twelve of them equaling the 

 length of the head, keeled and mucronate. Two canthal scales. Anterior 

 frontal not longitudinally divided. Supraocular scales in two larger rows, 

 of which the inner contains four or five scales, and the outer three or two 

 shorter ones. One parietal scale. All the head scales smooth. Scales of 

 sides equal dorsals, their keels directed upwards and backwards ; those of 

 belly smaller and entire. Thirteen femoral pores. 



Color above bluish olive, with numerous small irregular black spots. A 

 vertical black spot rises vertically from the shoulder, and is separated from 

 that of the opposite side by a space equal to its length. Inferior surfaces 

 brassy, the sides blue-tinged in front of the groin ; chin blue ; no black 

 collar on throat or nape. Two black bands, separated by a brown one on 

 the posterior face of the thigh. 



Length of head and body to vent, M. .040 ; length of head to line of 

 auricular meatus, .011 ; length of posterior leg, .030 ; of posterior foot, 

 .016; of tibia, .008. 



Guatemala, Hague. A single specimen. 



