188.5.] 263 [Cope. 



Cyclura b^olopha Cope. Proceeds. Academy Philadelphia, 1861, p. 

 123 ; American Naturalist, 1885, 1006. 

 Andros island, Bahamas ; Wood. 



Cyclura nubila " Shaw." Gray in Griffith's Animal Kingdom, ix, 39 fig. 

 Cope, American Naturalist, 1385, p. 1006. Lacerta nubila Shaw, 

 (teste Gray) Zoology. Iguana cyclura Cuv. Cyclura harlani Cocteau, 

 Hist. S. l'lsle Cuba par de la Sagra Rep., p. 96. C. carinaia Wiegm., 

 Herpet. Mexicana, not of Harlan. 

 Cuba, 



Cyclura cornuta Dand. Iguana cornuta Daudin, Rept., p. 382. La- 

 treille Hist. Nat. Rept., ii, 2G7, iv, 294. Metopocerus cornutus Wagler, 

 Nat. Syst. d. Amphibien, 1830, p. 147. Wiegmann, Herp. Mex., 

 1834, i,"p. 16. Dura. Bibr., Erp. Gen., iv, 211, 1837. Giinther, Trans. 

 Zool. Soc, London, 1882, p. 218, Pis. xliii, xliv. Boulenger Cat., 

 Brit. Mus., ii, 1885, p. 188. Cyclura nigerrima Cope, American Nat- 

 uralist, 1885, p. 1006. C. onchiopsis Cope, loc. cit. 



This species has been until recently but little known, although its name 

 frequently appears in literature. The characters ascribed to it by Dumeril 

 and Bibron do not agree with those of any individuals which have come 

 under my notice. These authors distinguish the genus Metopoceros from 

 Cyclura by the presence of two rows of femoral pores, a character which 

 does not exist in either of the four specimens in the National Museum. 

 The genus Aloponotus of the same authors possesses, according to them, 

 the same peculiarity. M. Boulenger, in the last (1885) edition of the 

 British Museum Catalogue, describes this character as though it only 

 occurs "sometimes" in this species, evidently regarding it as inconstant. 

 My confidence in its constancy leads me to describe as new two forms, 

 which perhaps belong to the C. cornuta, under the names C. nigerrima 

 and C. onchiopsis. These differ from each other very much as the genera 

 Metopocerus and Aloponotus are said by Dumeril and Bibron to differ 

 from each other, *. e., in the character of the scutellation. In the C. niger- 

 rima the scales are distinct everywhere ; in the C. onchiopsis they are 

 minutely granular on the sides of the back and on the nape and withers. 

 In a third specimen (in alcohol, No. 9977), the characters are interme- 

 diate. Thus, in the type of C. onchiopsis, the masseteric protuberances 

 have larger scales set in a general surface of granulations ; in the third 

 specimen, the same surface is nowhere granular, but is scutellate. The 

 anterior dorsal region is less granular in this specimen. I therefore think 

 it necessary to unite my supposed species, as has been done by M. Bou- 

 lenger. 



If the presence of the second row of femoral pores is not constant in the 

 C. cornuta, then the genus Metopocerus cannot be distinguished from 

 Cyclura. M. Boulenger relies on the rather greater number of denticles 

 in the lateral teeth in the C. cornuta, but my specimens show a tendency 



