49. SCKL0P0RU3. 223 



larger than those preceding. Dorsal scales much hirger than 

 ventrals, usiialh' longer than broad, strongly keeled, denticulated or 

 tricuspid, and euding in a long spine posteriorly, formiug parallel 

 longitudinal series ; thirty-five to forty-seven scales between the 

 occipital shield and the base of the tail ; seven to ten scales corre- 

 spond to the length of the shielded part of the head ; lateral scales 

 keeled, directed obliquely upwards and backwards, gradually merging 

 into the ventrals and dorsals ; ventrals smooth, distinctly bicuspid ; 

 thirty-six to fifty-four scales round the middle of the body. The 

 adpressed hind limb reaches the shoulder or the ear : tibia about as 

 long as the shielded part of the head ; the distance between the 

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

 distance between the end of the snout and the anterior extremity 

 or the middle of the oblique cervical fold. Eleven to sixteen femoral 

 pores. Caudal scales as large as or a little larger than dorsals. 

 Male with enlarged postanal scales, Olive or green above, uniform 

 or with blackish spots ; a black scapular band, rarely meeting its 

 fellow on the nape, extending across the throat in the males ; the 

 latter have the greater part of the throat, the belly except a narrow 

 median whitish zone, and frequently also the pectoral region, dark 

 blue ; belly yellowish white in the females, the throat frequently 

 blue-green. 



millira. milliin. 



Total length 196 Fore limb 40 



Head 20 Hind limb 58 



Width of head 19 Tail 110 



Body 66 



Central America. 



a-b. c? and yg. Jalapa. Mr. Hoege [C.]. 



c. (5. Yzabal, Guatemala. O. Salvin, P]sq. [C,]. 



d-(/,7i-l,m-)i. J, $,&yg. Duenas, (luatemala. O. Salvin, Esq. [C.°. 

 o-q. S 2- Guatemala. 0. Salvin, Esq. [C.]. 



r-v. (S 2 ■ Irazu, Costa Rica. F. D. Goduian and O. 



Salvin, Esqrs. [P.J. 



This form connects aS. torquatus and S. undulatus. From the 

 former, it is easily distinguished by the smaller scales and the 

 longer digits ; from the latter, however, no absolutely constant 

 structural character appears to distinguish it, or, rather, I have 

 failed to detect any. lint the coloration and various minor pecu- 

 liarities permit its separation from its northern congener. 



5. Sceloporus yarrovii. 



Sceloporus jarrovii, Cope, in Wheeler s Hep, Explor. 11'. lOOf/i Mer. 

 V. p. 569, pi. xxiii. tig. 2, and Proc. Am. Philos. Soc. xxii. 1885, 

 p. .-^90. 



Head-shields smooth ; a series of large transverse supraoculars ; 

 two cauthal scales ; occipital as long as broad, much larger than the 



