49. scELoPorvs. 223 
larger than those preceding. Dorsal scales much larger than 
ventrals, usually longer than broad, strongly keeled, denticulated or 
tricuspid, and ending in a long spine posteriorly, forming 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 tho 
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. 
millim millim 
Total length ...... 196 Fore-LIM: cua caters 40 
Cad erst sacha eee 20 Hind limb ........ 58 
Width of head 19 01 ae eee ee eee 110 
Body: ives vance ey 66 
Central America. 
Jalapa. Mr. Hoege [C.]. 
a-b. $ and yg. 
roi Yzabal, Guatemala. 
Duefias, Guatemala. 
Guatemala. 
Trazu, Costa Rica. 
ad. 
d-g,h-l,m-n. 3, 2,& yg. 
og dQ. 
rv. SQ. 
O. Salvin, Esq. [C.]. 
O. Salvin, Esq. [C.]. 
O, Salvin, Esq. [C.]. 
F. D. Godman and O. 
Salvin, Esqrs. [P.]. 
This form connects S. torqguatus 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. But the coloration and various minor pecu- 
liarities permit its separation from its northern congener. 
5. Sceloporus yarrovii. 
Sceloporus jarrovii, Cope, in Wheeler’s Rep, Explor. W. 100th Mer. 
v. p. 569, pl. xxiii. fig. 2, and Proc, Am, Philos, Soc. xxii. 1885, 
p. 896, 
Head-shields smooth ; a series of large transverse supraoculars ; 
two canthal scales ; occipital as long as broad, much larger than the 
