BARBOUR AND NOBLE: THE GENUS CYCLURA. ' 145 



e^ Two large flat median f rentals; gular region white in strong 



contrast to rest of ventral surface inornata. 



d? Infralabials separated from the malar scales by several rows of small 

 scales; canthal scale about the same size as the precanthal. 



e^ Enlarged frontal shield separated from the posterior prefrontals 

 by two rows of scales; 37 spines in the back section of dorsal 

 crest macleayi. 



e^ Enlarged frontal shield separated from the posterior prefrontals 

 by five rows of small scales; 44 spines in the back section of 

 dorsal crest caymanensis. 



DISCUSSION OF THE SPECIES. 



Cyclura macleayi Gray. 



Plate 1, 2; Plate 13, fig. 5, 6. 



Gray Cat. lizards, British mus., 1845, p. 190. 



Diagnosis: — Nasals broadly in contact with the rostral. Pre- 

 frontal region covered by a pair of elongate supranasals, immediately 

 followed by two pair of large prefrontals, the posterior pair several 

 times as large as the anterior pair; both pairs of prefrontals broadly 

 in contact on the median line of the snout, all these scutes covering 

 the snout slightly swollen and convex. Frontal region between pre- 

 frontals and the scarcely indicated supraocular semicircles covered 

 by two irregular rows of scales, the anterior row formed of scales 

 several times as large as those in the posterior one, immediately fol- 

 lowing the posterior row a large rounded median scale. Supraorbital 

 semicircles scarcely differentiated from the supraocular disc, separated 

 by two, partly by three, rows of scales. Occipital region covered 

 with enlarged and swollen scales, about two rows of scales between the 

 occipital and the semicircles. Canthus rostralis consisting of three 

 large scales, the posterior one elongate and in contact with two supra- 

 ciliaries which are also elongate, — all these scales on the top of the 

 head swollen, slightly keeled, and, with the exception of the small 

 supraocular scales, uniformly enlarged. Dorsal crest low, the largest 

 spine scarcely over a centimeter high, interrupted on the shoulders 

 and rump, 37 spines between these two points. Color above, brown- 



