LACER.TILIA IGUANIDAE SCELOPORUS CLARKII, CLARKII. 575 



Sceloponts spinosus, WIEGMANN, Herp. Mex., 1834, 50, pi. vii. BD.. IT. S. & Mex. 

 Bound. Snrv., pt. ii, 1859, Kept., 5. Id., P. 11. 11. Rep., x, 1853-54, Whippic'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. 



SCELOPORUS CLARKII, Baird & Girard, subspecies CLARKII, Baird & Girard. 



PLATE XXIII, FIGS. 1, la. 



Sceloporm darltii, BAIKD & GIEAED, Proc. Acad. Nat. Sci. PLila., 1852, 127. BD., U. 



S. & Mex. Bound. Surv., pt. ii, 1859, Reptiles, 5. 

 Sceloporus magister, HALLOW., Proc. Acad. Nat. Sci. Phila., vii, 1S54, 93. COPE, Proc. 



Acad. Nat, Sci. Phila., 1854, 93. 



HAB. Sonorau and South Pacific Regions. 



In addition to the typical S. clarJiii, 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 mncronate 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 serrae 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 internasals, 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, O m .166 ; length to vent, CT.OSO ; to .auricular meatus, 

 O m .019; to orbit, CP.OOS ; width between supercilia, O m .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 anirntil, and a profile of the head. 



