22-4 IGUANIDiE. 



parietals ; two large auricular scales. Dorsal scales larger than 

 ventrals, weakly keeled, shortlj' mucrouate ; about forty-three scales 

 between the occipital shield and the base of the tail ; ten scales cor- 

 respond to the shielded part of the head ; ventrals smooth, bicuspid; 

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

 reaches the ear ; tibia as long as the shielded part of the head ; the 

 distance between the base of the fifth toe and the extremity of the 

 fourth slightly exceeds the distance between the end of the snout 

 and the posterior border of the ear. Seventeen (or fifteen) femoral 

 pores. Caudal scales a little larger than dorsals. Olive above ; a 

 black, light-edged collar ; two light bands on the side of the neck, 

 the upper from the eye and continuous with the anterior border of 

 the collar, the lower commencing at the tip of the snout and passing 

 through the ear ; gular region and sides of belly blue ; chin and 

 middle of belly greenish-white. (Male above bluish-black ; dorsal 

 scales all with yellow centres.) 



millim. millim. 



Total length 103 Fore limb 32 



Head 17 Hind limb 45 



Width of head 15 Tail 95 



Body 51 



Arizona ; Xorth- western Mexico. 



a. 5 . Ciudad, Mexico. Hr. A. Forrer [C] 



6. Sceloporus ornatus. 



Sceloporus ornatus, BaircJ, Proc. Ac. Philad. 1858, p. 254 ; Cope, 

 Proc. Am. Philos. Soc. xxii. 1885, p. 396. 



Dorsal scales in about sixty-four transverse series, with but slight 

 carination, mucronation and deuticulation. Femoral jDores twelve. 

 A well-marked black cervical collar, complete above and margined 

 with yellowish. Colour dark green above, nearly black towards the 

 median line ; back with small j'ellowish spots. 



Coahuila, N. Mexico. 



7. Sceloporus diigesii. 



Sceloporus dugesii, Bocourt, Miss. Sc. Me.v., Rept. p. 188, pi. xviii. 



fig. 7 ; Cope, Proc. Am. Philos. Soc. xxii. 1885, p. 396. 

 intermedius, A. Dugcs, La Naturaleza, iv. 1876, p. 29, pi. i. 



figs. 21-32. 



Head-shields smooth ; supraoculars scarcely enlarged transversely; 

 two canthal scales ; occipital as long as broad, much larger than 

 the parietals ; anterior border of ear with a denticulation formed by 

 four pointed scales, which are not larger than those preceding. 

 Dorsal scales a little larger than ventrals, broader than long, keeled, 

 obtuse, not denticulated, converging to the middle line posteriorly ; 

 forty-four to forty-eight scales between the occipital shield and the 



