228 IGTJANID^. 



Sceloporus occidentalis, Baircl %■ Gir. Pi'oc. Ac. Phi/ad. 1852, p. 175; 

 Girard, U.S. Rrpl. Kxped., Herp. p. 383, pi. xix. figs. 8-14. 



frontalis, Baird S^- Gir. I. c. ; Gir. I. c. p. 384, pi. xix. figs. 1-7. 



longipes, Baird, Proc. Ac. Philad. 1858, p. 254. 



Head- shields smooth or rugose ; a series of four or five large 

 transversely dilated supraoculars ; two canthal scales ; occipital as 

 long as broad, or a little longer than broad, larger than the parietals ; 

 anterior border of ear with a denticulation of pointed scales not 

 larger than those preceding. Dorsal scales much larger than ven- 

 trals. strongly keeled, more or less strongly mucronate, entire, tri- 

 cuspid, or ver)^ indistinctly denticulated, forming parallel longitudinal 

 series ; thirty-three to forty scales between the occipital shield and 

 the base of the tail ; seven to nine (exceptionally six) scales cor- 

 respond to the length of the shielded part of the head ; lateral 

 scales keeled, directed obliquely upwards and backwards, nearly as 

 large as dorsnls ; vcntrals smooth, bicuspid : thirty-eight to fifty 

 scales round the middle of the body. The adpressed hind limb 

 reaches between the cervical fold and the orbit ; tibia as long as, 

 or longer than, the shielded part of the head ; the distance between 

 the base of the fifth toe and the extremity of the fourth exceeds 

 the distance between the end of the snout and the posterior border 

 of the ear. Thirteen to seventeen femoral pores. Caudal scales as 

 large as or a little larger than dorsals. Male with enlarged post- 

 anal scales. Grejdsh, brownish, or olive above, usually with un- 

 dulating dark brown bands across the back and fine lines across 

 the head ; sometimes a more or less distinct lighter dorso-lateral 

 band. Lower surfaces yellowish-white in the female, often spotted 

 with brown or with a brown median ventral line, and a bluish spot 

 on each side of the throat. Male with the throat and the sides of 

 the belly blue, edged with black, the p)ectoral and median ventral 

 regions yellowish ; the throat sometimes nearly entirely black, the 

 blue reduced to a round spot on each side. 



luillim. millira. 



Total length 155 Fore limb 29 



Head 16 Hind limb 44 



Width of head 14 Tail 85 



Body 54 



North America, Mexico, Guatemala. 



J. K. Lord, Esq. [P.]. 



M. Salle [C.]. 



Mr. F. Gruber [C.]. 



Dr. .T. Green [P.]. 



E. Doubledav, Esq. [P.]. 



Lord AmpthiU [P.]. 



Sir R. Murchison [P.]. 



O. Salvin, Esq. [C.]. 



