188 IGUANID^. 



Tympanum distinct. Body compressed ; a dorsal crest ; dorsal 

 scales small. A small gnlar pouch and a feeble transverse gnlar 

 fold. Digits compressed, with keeled lamellte interiorly. A long 

 series of femoral pores. Tail long, compressed. Lateral teeth den- 

 ticulated ; pterygoid teeth. 



West Indies. 



1. Metopoceros cornutus. 



? Aloponotus ricordi, Gray, Cut. p. 187. 

 Metopoceros cornutus, Gray, I. c. p. 188. 

 Lacep. Quadr. Or. ii. p. 493. 

 Iguana corniita, Daud. Sept. iii. p. 282. 

 Metopoceros cornutus, Waql. Si/st. Amph. p. 148 ; Dum. l^- Bibr. iv. 



p. 211 ; Cope, Proc. Ac. 'PhU'ad. 1866, p. 124 ; Gilnth. Trans. Zool. 



Soc. xi. 1882, p. 218, pis. xliii., xliv. 

 ? Aloponotus ricordii, Dum. ^ Bibr. p. 190, pi. xxxvii. 

 P Hypsilophus (Aloponotus) ricordii, Fitziny. Syst. Rept. p. 54. 

 Hypsilophus (Metopoceros) cornutus, Fitz. 1. c. 

 Cyclura uigerrima, Cope, Avi. Nat. 1885, p. 1006. 

 oncliiopsis. Cope, I. c. 



Head large, swollen below the ears, covered with unequal-sized 

 scales ; snout obtuse, with obtuse canthus rostralis, with three 

 enlarged scales, which in the adult male are conical, horn-like ; occi- 

 pital slightly enlarged ; nostril largo, oval, near the end of the 

 snout, pierced in a convex nasal which is either in contact with the 

 rostral or separated from it by small scales ; ten to twelve upper 

 and as many lower labials ; a row of enlarged scutes, conical in the 

 male, above the upper labials, from below the front of the orbit to 

 below the tympanum : a row of similar keeled scutes bordering the 

 orbit interiorly, and extending to above the tympanum ; latter large, 

 vertically oval. Gular region covered with very small keeled scales, 

 intermixed on the sides with enlarged tubercles ; a row of large 

 chin-shields on each side, the anterior in contact with the labials, 

 the others strongly keeled and separated from the latter by smaller 

 scutes. Dorsal crest formed of lanceolate lobes, the longest of which 

 (in the male) measure a little less than the diameter of the tym- 

 panum ; a nuchal crest of very low spines, widely separated from 

 the dorsal. Dorsal scales minute, flat, granular, surrounded by 

 finer granulations ; these scales sometimes very indistinct, the skin 

 appearing almost naked ; ventral scales a little larger, flat, smooth, 

 juxtaposed. Limbs strong ; digits rather short, the third toe 

 strongly denticulated along the inner side of the basal joint. A 

 series of thirteen to eighteen femoral pores on each side ; frequently 

 a second, somewhat shorter, parallel series of pores. Tail long, 

 compressed, crested above, with verticils of keeled scales forming 

 very indistinct segments. Blackish, uniform or with lighter varie- 

 gations. 



ceiitim. ceiitiin. 



Total length (tail broken) 98 Body 36 



Head 12 Fore limb 21 



Width of head 9 Hind limb 30 



