188 IGUANIDZ. 
Tympanum distinct. Body compressed; a dorsal crest; dorsal 
scales small. A small gular pouch and a feeble transverse gular 
fold. Digits compressed, with keeled lamelle inferiorly. A long 
series of femoral pores. ‘Tail long, compressed. Lateral teeth den- 
ticulated ; pterygoid teeth. 
West Indies. 
1. Metopoceros cornutus. 
? Aloponotus ricordi, Gray, Cat. p. 187. 
Metopoceros cornutus, Gray, 1. c. p. 188. 
Lacép. Quadr. Ov. ii. p. 493. 
Iguana cornuta, Daud. Rept. iii. p. 282. 
Metopoceros cornutus, Wagl. Syst. Amph. p. 148; Dum. & Bibr. iv. 
p. 211; Cope, Proc. Ac. Philad. 1866, p. 124; Gitinth. Trans. Zool. 
Soc. xi, 1882, p. 218, pls. xliii., xliv. 
? Aloponotus ricordii, Dum. § Bibr. p. 190, pl. xxxvii. 
? Hypsilophus (Aloponotus) ricordii, Fitziny. Syst. Rept. p. 54. 
Hypsilophus (Metopoceros) cornutus, Fitz. 1. c. 
Cyclura nigerrima, Cope, Am, Nat. 1885, p. 1006. 
onchiopsis, Cope, l. ¢. 
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 large, 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 inferiorly, 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. 
centim. : centim. 
Total length (tail broken) 98 Body vine ces 36 
Head oii ssiie wily meas 12 Fore limb ...... 21 
Width of head ........ 9 Hind limb ..... 30 
