BARBOUR AND NOBLE: THE GENUS CYCLURA. 159 



series separated by a double row of rather large irregular scales. 

 Frontal and frontoparietal regions with small and irregular scales 

 very slightly keeled, each scale depressed so as to make the interstices 

 stand out like a network. Supraorbital semicircles differentiated 

 only posteriorly where they are formed of broad, slightly keeled scales. 

 Occipital region with a huge swelling on each side, each covered with 

 flat scales. Canthus rostralis formed of a group of three, medium 

 sized keeled scales. Dorsal crest not interrupted on either shoulder 

 or rump; largest spine about a centimeter in length; fifty spines in 

 the crest from shoulders to rump. Color above mud-gray washed 

 with green anteriorly; a series of straw color stipplings covering the 

 dorsal and lateral surfaces, these stipplings uniting into blotches 

 posteriorly. 



Habitat: — Jamaica, where it is now exceedingly rare, being only 

 found on a few islets off the coast where the mongoose has not been 

 introduced. The mongoose eats the eggs and the very young. 



Description: — Adult male, M. C. Z. 9397 Goat Island, near Old 

 Harbour, Jamaica, 1914, Arthur Perrin. 



Rostral wider than mental, separated from the nasals by several 

 rows of very fine granules; nasal large, ovoid and perforated on the 

 posterior half by a large semicircular nostril; immediately behind and 

 adjoining the nasal, a series of three large shields, slightly swollen 

 and a trifle convex; the series separated by a double row of rather 

 large irregular scales; the last pair of scales in the series about twice 

 as large as the anterior pair; the scales of each series broadly in contact 

 with each other without any intervening scales; a pair of large tri- 

 angular postnasals; scales of the frontoparietal region all small and 

 irregular, each scale depressed so that the interstices stand out like 

 network; supraorbital semicircles only evident posteriorly, formed of 

 broad, slightly keeled scales; scales covering the supraocular region 

 smaller than those of the frontal region, each scale very slightly 

 keeled; occipital smaller than nasals, located well forward between 

 the semicircles from which it is separated by three row^s of scales; 

 occipital region swollen out into a pair of huge humps, each covered 

 with a group of rather large, flat, slightly keeled scales; two rows of 

 strongly keeled supraciliaries; canthus rostralis consisting of a group 

 of three, medium sized keeled scales; a well-developed series of 

 strongly keeled suboculars continued backward as a supratympanlc 

 series to above the middle of the ear; six supralabials to the middle 

 of the eye; a series of very small scales separating the suboculars and 

 the supralabials; above the angle of the mouth and in front of the 



