670 REPORT OF NATIONAL MUSEUM, 1902. 





Genus CYCLURA« Harlan. 



1824. CycJura Harlan, Journ. Phila. Acad., IV, p. 250 (type C. carinata). 



1830. Metopoceros Wagler, Nat. Syst. Amph., p. 147 (type Iguana cornuta). 



1845. Metapoceros Gray, Cat. Liz. Brit. Mus., p. 188 (errore). 



1866. Metapocerus Cope, Proc. Phila. Acad., 1866, p. 124 (emended). 



CYCLURA CORNUTA'; (Bonnaterre). 



1789. Lacerta cornuta Bonnaterre, Tabl. Encycl. Erpet., p. 40, pi. rv, fig. 4 (type 

 locality, Santo Domingo). — Metopoceros cornutus Dumeril and Bibron, 

 Erpet. Gen., IV, 1837, p. 211. — Guenther, Trans. Zool. Soc. London, 

 XI, 1882, p. 218, pis. xliii-xliv (locality unknown). — Boulenger, 

 Cat. Liz. Brit. Mus., II, 1885, p. 188.— Meerwarth, Mitth. Naturh. 

 Mus. Hamburg, XVIII, p. 26 (Mona Island, Haiti). — Cydura cornuta 

 Cope, Proc. Amer. Philos. Soc, XXIII, 1885, p. 263. 



There are certain indications that the large rock iguana which lives on 

 Mona Island is different from what is usually considered typical Cydura 

 cornuta from Haiti, but lack of specimens from the latter island for 

 direct comparison with our four Mona specimens makes it impossible 

 to prove it at present. These lizards are scarce in collections, and in 

 no one museum is there at present material enough to decide the ques- 

 tion; in fact, there is only one museum which has specimens both 

 from Haiti and from Mona, one from the former and two from the 

 latter island. 



The first character to attract my attention was the absence of an 

 intercalary row of scales between rostral and nasals in all the known 

 specimens from Mona Island, six in all, namely, four in the U. S. 

 National Museum and two in the museum at Hamburg. Moreover, 

 all our Mona specimens have a double row of scales between the 

 median frontal horn and the last one of the prefrontal shields or 

 horns. 



In the Haitian or Santo Domingan specimens which I have seen, or 

 of which I have record, these features are as follows: In the type 

 (from Santo Domingo) described by Dumeril and Bibron the series 

 of scales between rostral and nasal is well developed; so I found it in 

 the specimen in the Hamburg Museum (No. 1047); so also in the spec- 

 imen from Gonaives, Haiti, in the Vienna Hof Museum (collected by 

 Erber in 1878); and so Prof. S. Garman writes me that it is in the 

 Haitian specimen in the Museum of Comparative Zoology (from 

 Jeremie, Haiti, collected by Dr. D. F. Weinland). But according to 

 a recent letter from my friend, Dr. Siebenrock, there is another spec- 

 imen in the Vienna Museum from Haiti in which "the rostral is sepa- 

 rated from the nasals by a series of scales only laterally but not 

 medially." Consequently, out of six Mona specimens and five from 



a kvkXoz, ring; ovpd, tail. b Latin = horned. 



