154 bulletin: museum of comparative zoology. 



Cyclura rileyi Stejneger. 

 Plate 7; Plate 15, fig. 3, 4. 

 Stejneger, Proc. Biol. see. Wash., 1903, 16, p. 129. 



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

 of the top of head flat or only slightly swollen. Prefrontal region 

 covered by a pair of elongate supranasals in contact with the nasals 

 and also in contact with each other, each supranasal followed by two 

 large prefrontals, the posterior the larger, the prefrontals of each 

 side in contact with each other but separated from the series of the 

 opposite side by two rows of large scales. Top of head behind pre- 

 frontals covered with numerous small scales; the scales of the supra- 

 ocular region much smaller than the others; except for a grouping 

 of a few large scales on each side of the occipital, and a semirosette 

 of enlarged scales in the frontoparietal region, these scales without 

 a definite arrangement. Canthus rostralis consisting of a group of 

 three scales, the canthal and precanthal about the same size and larger 

 than the third scale. Dorsal crest interrupted on both shoulders 

 and rump, formed of scales of varying height; nuchal section formed 

 of about twenty spines about the same in width and varying from 

 one to ten millimeters in height, according to the proximity to the 

 extremities of the series, back section formed of seventy-six spines, 

 scarcely over a millimeter in height, except for the last fourteen spines 

 which average about 5 millimeters; caudal section formed of heavier 

 spines than those of the back, about 4 millimeters in height. Limit- 

 ing row of each verticle clearly differentiated. Ground color, bluish 

 gray, heavily blotched with confluent tawny yellow spots except on 

 the posterior ventral surface, which is uniform yellowish gray; head 

 very much paler, tail darker than the rest of the body. 



Habitat: — Two small cays in the large salt water lagoon on Watlings 

 Island. 



Description: — Adult male, M. C. Z. 10918, Watlings Island, Baha- 

 mas, April, 1915, \\. W. Worthington. 



Rostral as wide as the mental broadly in contact with the nasals; 

 nasals vtry large, about the size of the posterior prefrontals, broadly 

 hexagonal, in broad contact with each other; each nasal perforated 

 posteriorly by an elongate nostril; each nasal in contact with an 

 elongate supranasal and two postnasals; nasals and supranasals 



