10 Stejneger A New Species of Large Iguana* 



Cyclura rileyi, sp. nov. 



Diagnosis:. Combs on second and third toes; scales on muzzle large; 

 no median protuberances anterior to eyes; verticils on tail feebly devel 

 oped; a large patch of tubercular scales on side of throat below angle of 

 mouth; a small shield in contact with nasal between supranasal and 

 postnasal; dorsal crest represented by about 75 (71-79) enlarged strongly 

 keeled scales. 



Habitat. Watlings Island, Bahamas. 



Type. United States National Museum, No. 31,969; Watlings Island, 

 Bahamas, July 13, 1903; J. H. Riley, collector. 



Description. Adult female; United States National Museum, No, 

 31,969; Watlings Island; July 13, 1903; J. H. Riley, collector. Rostral 

 wide, much wider than mental, broadly in contact with nasal; nasal 

 very large, larger than any other shield on the head, broadly hexagonal, 

 forming a long suture with its fellow; nostril nearly ovoid, large, near 

 the upper posterior corner of the nasal; nasal in contact with a large 

 elongate supranasal, and two postnasals, the upper one small and squar 

 ish, the lower larger, both this and the nasal separated from the anterior 

 supralabials by two or three rows of small shields; supranasals broadly 

 in contact on the middle of the snout, each followed by two pairs of pre- 

 frontals, one behind the other, both larger than supranasals, and the 

 posterior pair larger than the anterior; the pref rentals are separated on 

 the median line by a few small and irregular shields; top of head behind 

 prefrontals covered by small irregular polygonal shields, those on outer 

 and anterior portion of supraocular region being smaller, but otherwise 

 without a clearly recogniza>ble arrangement into supraorbital semi-circles 

 and supraocular disks; all cephalic shields and scales smooth or slightly 

 tuberculate; occipital somewhat larger than the adjacent scutes; no dis 

 tinctly differentiated superciliary shields, only two of the anterior ones 

 adjoining the canthus rostralis being somewhat enlarged and elongated; 

 four small shields on canthus rostralis behind postnasals; shields cover 

 ing the loreal triangle numerous, flat, elongate, irregularly polygonal and 

 varying in size, anteriorly wedged in between the nasals and the supra 

 labials, two to three rows separating the latter from the postnasal; a 

 series of enlarged keeled suboculars separated from the supralabials by 

 about seven rows of small elongate hexagonal scales; scales covering the 

 temporal: region irregular in size and shape, some almost granular; a 

 group of larger tubercular shields or scales in front of the upper edge of 

 the tympanum, one being particularly prominent, and a single series of 

 similar ones along the anterior edge of the tympanum ; tympanum ovoid, its 

 vertical diameter less than diameter of eye; supralabials low and elongate, 

 six to under the center of the eye; lower labials higher than the supra 

 labials, but smaller than the malar shields; the three anterior malars in 

 contact with the lower labials, the posterior ones separated from them 

 by one and two rows of elongate polygonal shields but no granules or 

 small scales; the posterior malars with a blunt tubercle or keel at the 



