156 bulletin: museum of comparative zoology. 



Material Examined. 



No. of 

 epeci- 

 M.C.Z. mens Age Sex Locality Date Collector Remarks 



10918 1 adult male Watling's Island 1909 W. W. Worthington Descrip. 

 9272 1 adult male Watling's Island 1903 J. H. Riley Para- 



type 



Cyclura nuchalis, nov. sp. 

 Plate 8, fig. 1, 2. 



Type, an adult, Acad. Nat. Sci. Phil. 11985, Fortune Island, Baha- 

 mas. Collection of Arthur Erwin Brown. 



Since this species is in general similar to C. rileyi no detailed descrip- 

 tion is necessary, the differences being expressed in the following 

 diagnosis. 



Diagnosis: — Nasals broadly in contact with the rostral. Scales 

 of the prefrontal and frontoparietal regions similar to those of C. 

 rileyi; enlarged frontal scale proportionately larger, surrounding scales 

 proportionally smaller than those of C. rileyi; supraorbital semicircles 

 distinct posteriorly, formed of slightly tuberculate scales. Occipital 

 scales more tuberculate than those of C. rileyi. Prefrontal scale 

 more elongate than that of C. rileyi. Dorsal crest very different from 

 that of any other Cyclura. This crest interrupted on the shoulders, 

 widely interrupted on the rump; nuchal section formed of fourteen 

 wide spines, the three central ones largest, about a centimeter high, 

 the rest grading off in size toward the extremities; of these three 

 central spines the most anterior one about half a centimeter wide at 

 the base, in other words about twice as broad as any of the others; 

 the crest running from shoulders to rump scarcely over a millimeter 

 high, composed of sixty-two spines; caudal crest slightly higher than 

 that of the back. Scales of the limiting row of each verticil only 

 slightly larger than other scales of the verticil; about five scales in the 

 bulge of each limiting row while C. rileyi averages four or less. The 

 type of coloration similar to that of C. rileyi but the ground color 

 brownish gray instead of blue-gray; general tonality of the head gray- 

 ish brown instead of straw color. 



Habitat: — Fortune Island, just to the south of Long Island, 

 Bahamas. 



Material examined. 

 The type only is known. 



