200 BULLETIN 17 7, UNITED STATES NATIONAL MUSEUM 



rather larger and wrinkled on snout, more tubercular on frontal region, 

 and similar but smaller in interorbital space; supraocular semicircles 

 evident, though the component keeled scales hardly exceed the similar 

 scales that form the supraorbital disk; occipital region only slightly 

 elevated above supraorbital region; semicircles separated by about 

 four rows of smaller tubercular scales; occipital scale two-thirds 

 height of rostral, located between posterior borders of semicircles 

 from which it is separated by two rows of scales; a series of moderately 

 keeled suboculars continued backward as a supratympanic series to 

 above the ear; shields very small and tubercular above and below the 

 posterior half of this series; seven or eight supralabials to a point 

 beneath the center of the eye; a series of small scales separating the 

 suboculars and supralabials; tympanum elliptical, erect, large; seven 



Figure 63.— Cyclura ricordii: a, Side of head; b, top of head. U.S.N. M. No. 62557, from 

 Duverge, Dominican Republic. One-half natural size. 



or eight lower labials to center of eye; a series of enlarged malar 

 scales, the posterior ones moderately keeled and separated from the 

 lower labials by one or two rows of flat scales as large as the anterior 

 malars; dorsal and ventral scales rhomboidal, obliquely keeled, the 

 keels pointing toward the median line; dorsal scales very small, about 

 110 scales measured posteriorly from the axillary contained in the 

 distance from end of snout to anterior edge of tympanum; ventral 

 scales slightly larger than dorsals and more distinctly keeled; from 

 the occiput along the median line of the neck and back a series of 

 enlarged, strongly keeled scales forming a high serrated crest, which is 

 much reduced on the shoulders and on the rump but is continuous 

 with the caudal crest ; scales of nuchal crest narrower and appreciably 

 longer than those of dorsal crest; height of the crest scales on the 

 middle of the back one and one-quarter times the height of the rostral, 

 six to the distance from end of snout to anterior edge of tympanum; 

 about 35 scales in the dorsal crest between shoulder and rump; 



