Cope.] 262 [ 0cL le> 



tatvs, are entirely terrestrial in their habits. The genera are distin- 

 guished as follows : 



I. Premaxillary and symphyseal teeth conical. 

 a Posterior digits with separate combs. 



Tail with much of its length free from spines ; a gular fold, Cyclura Harl. 

 aa No separate combs on posterior digits. 



Tail with the basal half spinous ; a throat fold Ctenosaura Wieg. 



Tail short, spinous to the end ; a throat fold Cachryx Cope. 



Tail not spinous ; a throat fold Brachylophus Cuv. 



Tail not spinous ; a dewlap which has a crest of spines on its anterior 

 edge Iguana Laur. 



II. Premaxillary and symphyseal teeth trilobate ; no combs on the 



posterior digits. 



A throat fold ; tail not spinous , Conoloplms Fitz. 



No throat fold ; tail not spinous Amblyrhynchus Bell. 



CYCLURA Harlan. 



Journal Academy Natl. Sciences, i, p. 242, 1825. Dum. Bibr., Erp. Gen., 

 iv, 214, 1837. 3/etopocerus Wagl., Natiirl. Syst. d. Amphibien, p. 147, 

 1830. Dum. Bibr., Erp. Gen., iv, p. 210, 1837. ? Aloponotus Dum. Bibr., 

 Erpet. Generate, iv, p. 189, 1837. 



The species of this genus known to me are the following : 



I. Scales of muzzle all small ; combs on third toe only. 



Several rows of infralabial scuta ; five scales on canthus rostralis ; crest 

 interrupted at rump only C. carinata Harl. 



II. Large scuta on muzzle ; combs on third toe only ; one row of 



large infralabials. 

 Infralabials and other scuta in contact with each other and with labials ; 

 two scales on canthus rostralis ; crest low, much interrupted at nape 



and rump ; color uniform C. ba>olopha Cope. 



Infralabial and other scuta separated from each other and from labials by 



small scales ; four scales on canthus rostralis; green, with bands 



C. nub il> i Gray. 



III. Large scuta on muzzle ; one on middle line protuberant ; combs 

 on second and third toes ; several rows of large infralabials. 



Scales very irregular, often minutely granular on scapular regions ; a 

 trace of whorls on tail ; crest interrupted at nape and rump ; black. . 



C. cornula Daud. 

 The reputed species Oyclura maclcayi Gray, from Cuba, and O.lophoma 

 Gosse, from Jamaica, are unknown to me by autopsy. 

 Cyci/OBA carinata Harlan, Jour. Academy Philadelphia, iv. p. 250, 1885, 

 pi. 15. Cope, Proceeds. American Philosoph. Society, 1870, 

 American Naturalist, 1885, 1006. 

 Turk's island, Bahamas ; Harlan, Ebcll. 



