BARBOUR AND NOBLE: THE GENUS CYCLURA. 145 
e? Two large flat median frontals; gular neee white in strong 
contrast to rest of ventral surface. . Nisley Soo SUL Oh 
d? Infralabials separated from the malar eeales by sev aa 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. Cea ee Ns Hee ecULTG ZiT Oe 
e irdaeped eorieal Geield Remaevind teh fe posienion enaniais 
by five rows of small scales; 44 spines in the back section of 
orsale crests cesta cece eas HATES Cees HOR ois COUMUAIIENSIS: 
DISCUSSION OF .THE SPECIES. 
CYCLURA MACLEAYI Gray. 
Plate 2; 2: Plate 13, Gg. 5.6. 
Gray Cat. lizards, British ae | 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- 
