THE HERPETOLOGY OF HISPANIOLA 195 



anterior extensions of the supraorbital semicircles are 4 to 13, with a 

 single row of scales usually separating the semicircles between the eyes 

 and with narrow contact between them in two cases. The occipital 

 is usually separated from the semicircles by two scales, rarely by one 

 or three irregular ones. Supralabials number six to nine, with the 

 fifth to the eighth coming under the center of the eye. Infralabials 

 are six to nine also, but the posterior ones are often very small. Malar 

 scales are usually in three subequal rows, sometimes in four. The 

 tail has four vertical rows between verticils as a rule, but sometimes 

 there are five rows in the proximal region, and in one instance only 

 three. Lamellae under the free part of the fourth toe are between 

 23 and 30. The largest male is the type, with a length of 58 mm.; 

 the largest female is 50 mm. long. Most of the larger ones are com- 

 pletely black above, without traces of the original pattern. The 

 younger ones may have four wide longitudinal sepia stripes on a 

 slate-gray ground, the median pair close together near the center of 

 the back, the outer pair dorsolateral in position. There is a narrow 

 slate-gray lateral stripe of the ground color, and below this the sides 

 are sepia, fading gradually into the ventral color. In some of the 

 specimens the dark longitudinal stripes are broken up with still darker 

 irregular transverse spots, which descend on the sides wherever the 

 sepia color occurs, although interrupted completely by the slate-gray 

 stripes. The anterior half of the chin is squarely marked off with pale 

 slate-gray in most of the younger ones. The top of the head frequently 

 shows dark transverse markings, while the paler ventral surfaces may 

 be heavily spotted with dark. 



Genus CYCLURA Harlan 



1824. Cyclura Harlan, Journ. Acad. Nat. Hist. Philadelphia, vol. 4, p. 250 

 (type, C. carinata). 



Hispaniola and its outlying islets support two species of ring-tailed 

 iguana. These may be distinguished by the following characters: 



Snout with conspicuously enlarged conical tubercles comuta (p. 195) 



No conspicuously enlarged scales on snout ricordii (p. 199) 



CYCLURA CORNUTA CORNUTA (Bonnaterre) 



Figure 62 



1789. Lacerta comuta Bonnaterre, Tableau encyclop^dique et m^thodique des 

 trois r^gnes de la nature . . . Erp6tologie, p. 40, pi. 4, fig. 4 (type locality, 

 "dans les mornes de I'hopital, entre I'Artibonite et les Gonaives," Santo 

 Domingo [now Haiti]). — Bechstein, Herrn De La Ccpede's Naturgeschichte 

 der Amphibien . . . , vol. 1, p. 499, 1801. 



1789. Iguana cornuta Lac^pede, Histoire naturelle des quadrupedes ovipares et 

 des serpents, vol. 2, p. 493. — Daudin, Histoire naturelle g6n6rale . . . des 

 reptiles, vol. 3, p. 282, 1802. — Latreille, Histoire naturelle des reptiles . . . , 

 vol. 2, p. 267, 1801. 



