LACERTILIA— IGUANIDAE— SCELOPORUS CLARKII, CLARKII. 575 



Sceloporns spinosiis, Wiegmann, Heip. Mex., 1834, 50, pi. vii. — Bd., U. S. & Mex. 

 Bound. Snrv., pt. ii, 1S59, Rept., 5.— Id., P. It, R. Rep., x, 1853-54, Whipple's 

 Route, 38.— Cope, Check-List N. A. Batrach. & Rept., 1875, 49. 



Hab. — Arizona and Texas. 



Specimens secured in Arizona in 1871. Is not common. 



SCELOPORDS CLARKII, Baird & Girard, subspecies CLARKII, Baird & Girard. 



Plate XXIII, Figs. 1, la. 



Sceloporns clarkii, Baibd & GlEAED, Pioc. Acad. Nat. Sci. Phila., 1852, 127.— Bd., TJ. 



S. & Mex. Bound. Surv., pt. ii, 1809, Reptiles, 5. 

 Sceloporns magister, Hallow., Proc. Acad. Nat. Sci. Phila,, vii, 1854, 93. — Cope, Proc. 



Acad. Nat. Sci. Phila., 1S54, 93. 



Hab. — Sonoran and South Pacific Regions. 



In addition to the typical 8. clarkii, obtained by the expedition in 1873, 

 a variety was also collected, which has been described by Professor Cope as 

 follows : 



" Scales of the back large, keeled, and mucronate in twenty-eight 

 transverse rows from head shields to rump, and six longitudinal rows at 

 the latter point. Edges without or with one or two serrse near the apex. 

 Abdominal scales smaller ; lateral intermediate ; the former mostly entire ; 

 the gulars with one or two shallow notches. Head shields smooth, large ; 

 supraorbitals in one row only of transverse shields, separated only ante- 

 riorly from the frontals by a row of narrow scales. Eight intemasals, six 

 of them in a median row of three pairs ; five prefrontals, one broad and 

 median ; two frontals ; two fronto-parietals, each joined by a single parietal 

 on each side ; an interparietal as broad as long. Auricular scales not differ- 

 ent from those in front of them. Hind leg extended, bringing the end of the 

 outer toe to the humerus. Twelve femoral pores on each side. 



"Total length, m .166; length to vent, m .080; to auricular meatus, 

 m .019 ; to orbit, m .008 ; width between supercilia, (T.012. 



"Five or six blackish undulating cross-bands on an iron-gray ground; 

 behind, on an angle of each bar, on each side, is a yellow scale, thus making 

 two rows of small yellow spots. Below straw color ; throat brown, banded 

 lengthwise, with blue between. Sides with blue shades." 



The plate affords view of the entire animal, and a profile of the head. 



