102 IGUANID^. 



irregular, unequal, smooth, the enlarged ones sometimes feebly 

 keeled ; ventral scales moderately large, strongly keeled, imbricate, 

 arranged in transverse series. Limbs long, covered with very large 

 keeled scales ; the adpressed hind limb reaches the tip of the snout 

 or a little beyond. Tail more than twice as long as head and body, 

 slender, compressed, above with feebly keeled scales, interiorly with 

 larger strongly keeled ones. Olive- or reddish-brown above, with 

 irregular blackish-brown spots or cross bands ; a white spot on the 

 elbow and another at the base of the arm ; blackish streaks radiate 

 from the eye, extending down to the lo\\ er lip, one directed obliquely 

 towards the lower border of the tympanum and another to its upper 

 border ; lower surfaces pale brown, with a few darker spots. 



Total length 338 millim. 



Head (to extremity of helmet). 53 ,, 



Width of head 18 „ 



Body 73 „ 



Fore limb 52 ,, 



Hind limb 98 „ 



Tail 235 „ 



Guatemala to Costa Eica. 



a-b. J • * Vera Paz. O. Salvin, Esq. 



c. 5 . Costa Rica. O. Salvin, Esq. 



d, Yg. Costa Rica. 



C.l. 

 C.]. 



2. Corytliophanes percarinatus. 



Corythophanes percarinatus, A. Dum. Arch. Mus. viii. p. 518, pi. xx. 

 fig. 3 5 Bocourt, Miss. Sc. Mex., Rept. p. 120, pi. xvii. fig. 2. 



The upper surface of the head constricted behind the supraciliary 

 ridge ; the parietal ridges uniting only a short distance in front of 

 the extremity of the helmet ; nostril equally distant from the orbit 

 and the tip of the snout ; upper head-scales keeled or striated ; a 

 short series of enlarged keeled scales from the orbit to above the 

 tympanum, the posterior projecting, tubercle-like. Gular scales 

 elongate, strongly keeled, forming longitudinal series, separated by 

 granules ; a strong crest of triangular scales along the throat. 

 Nuchal crest with serrated edge, descending gradually from the 

 cranial crest to the serrated dorsal ridge. A more or less distinct 

 fold along each side of the back. Dorso-lateral scales irregular, 

 unequal, all the larger ones distinctly keeled ; ventral scales large, 

 strongly keeled. Limbs as in the preceding. All the caudal scales 

 strongly keeled. Olive-brown above, with irregular blackish-brown 

 spots or cross bands ; broad black bands radiating from the eye, not 

 extending beyond the orbit, except one which reaches the anterior 

 border of the tympanum ; lower surfaces whitish olive. 



Total length 300 millim. 



Head (to extremity of helmet). 42 „ 



