Stejneger A New Species of Large Iguana. 131 



lower edge; throat covered with small uniform juxtaposed scales; on 

 each side below the angle of the mouth a patch of larger, more rounded 

 tubercles separated by scales corresponding to the other throat scales; a 

 strong transverse fold across the lower neck joined by numerous longi 

 tudinal folds on the sides of the neck and a high (about 25 mm.) dewlap 

 on the median line; back covered with small uniform squarish scales in 

 tolerably regular series, 10-12 scales in the long diameter of the tym 

 panum; a curved nuchal crest consisting of about 20 spines, the longest 

 about 25 mm. high and slightly falcate; a series of 79 enlarged, elongate, 

 keeled scales forming a slight crest on the median line of the back; 

 scales on underside similar to those on back, those on upper side of arm, 

 especially forearm, somewhat larger, those on hind legs even more so 

 (about 6 in the long diameter of the ear) and with indication of keels; a 

 single series of about 20 femoral pores; inner side of second toe with one 

 "comb," of third toe with two "combs," each consisting of three lobes; 

 tail compressed, covered with obliquely keeled scales in vertical rows 

 forming but faintly indicated verticils, about five rows of the larger 

 scales to a verticil where such can be made out; tail surmounted by a 

 series of enlarged, pointed, triangular scales forming a strongly serrated 

 edge. 



Color, which according to Mr. Riley has not changed materially in the 

 preserving fluid, dull "smoke gray, "on the upper surface irregularly 

 and obscurely marked with variously anastomosing blotches and mar- 

 blings of "tawny-olive." 



Dimensions. Total length (tail regenerated), 597 mm. ; tip of snout to 

 vent, 272; tip of snout to orbit, 24; tip of snout to ear, 51; width of head, 

 35; fore limb, 106; hind limb, 161; vertical diameter of tympanum, 9. 



In No. 31,966 which has the tail complete the dimensions are as fol 

 lows: Total length, 558 mm.; tip of snout to vent, 208; vent to tip of 

 tail, 350. The tail is consequently more than 1-J times the length of 

 head and body. 



Variation. The individual variation displayed by the seven specimens 

 collected is surprisingly small. The scutellation is essentially as in the 

 type specimen described above, with here and there an additional 

 small shield intercalated where two sutures meet, the only greater devi 

 ation being that of No. 31,970 in which the anterior prefrontals are 

 devided transversely. The anterior superciliaries are also better defined 

 in some of the specimens than in the one described, and the arrange 

 ment of the supraorbital ridge is also occasionally better defined. The 

 number of enlarged keeled scales forming the dorsal crest, or rather 

 ridge, varies between 71 and 79, one each having these numbers, one 

 each having 73, 76 and 77 and two 75 scales. The color is also fairly 

 uniform throughout the series. 



Remarks. This new species, though probably nearest related to the 

 Cuban C. cyclura, shows certain leanings towards C. cornuta in the small- 

 ness of the scales covering arms and legs and the undeveloped condition 

 of the caudal verticils. The similarity to the other Bahaman species is 



