38 PROCEEDINGS OF THE NATIOITAL MUSEUM vol. 73 



CTENOSAURA BAEERI Stejneger 



Plates 21, 22 

 Ctenosaura bakeri Stejneger, 1901, Proc. U. S. Nat. Mus.. vol. 23, pp. 467-468. 



Type.— Cat. No. 26317. U.S.N.M., male. 



Type locality. — Utilla Island, Honduras, 1900; Dr. J. E. Jarnigan, 

 collector. 



Diagnosis. — A noticeable dewlap hanging from posterior part of 

 throat; caudal whorls of spines separated by two rows and one row of 

 flat scales. Dorsal crest high over neck and shoulders and gradually 

 becoming shorter caudad, not continuous with caudal crest; upper 

 sides of tibia with somewhat enlarged keeled scales; spines of median 

 caudal crest subequal, much longer than the other caudal spines. 

 - Distribution. — This species is confined to Utilla Island, Honduras. 

 This island is only 7 miles long and is situated just off the north coast 

 of Honduras, in the Caribbean Sea. It is located within the 100-fathom 

 line of the mainland. It may occur on Bonacca and Ruatan Island 

 also. 



Description.— Cht. Nos. 26317, U.S.N.M., adult female, type; 25324, 

 adult female paratype. Head normal in length, covered with small 

 hexagonal scales having slightly decurved muzzle. Head scales 

 slightly rugose in adults. Supraoculars small, being separated from 

 each other by four rows of scales; parietal scales smaller than those on 

 top of muzzle; nostrils large, much nearer tip of snout than orbit, 

 almost tubular, opening obliquely backward; rostral larger than men- 

 tal; lores flat; 10-12 enlarged supralabials; 9-11 enlarged sublabials; 

 ear opening as large or almost as large as orbit; dorsal scales small and 

 smooth, hardly more than half the size of ventral scales, being almost 

 granular on neck and gradually increasing in size posteriorly; dorsal 

 crest well developed over neck and shoulders, the spines gradually 

 diminishing in size posteriorly until at sacrum they become lost, the 

 dorsal crest not being continuous with caudal crest. Spines and scales 

 of dorsal crest 45 to 50 in number, beginning immediately behind head, 

 the first scale is smallest, while the crest is highest over neck and 

 shoulders, gradually diminishing in size posteriorly, until over small 

 of back (loins) it consists merely of a median dorsal row of enlarged 

 and slightly carinated scales. The spines are very compressed. 

 Maximum height of dorsal crest scales is 3.5 mm., maximum width 

 2.5 mm. They are falcate in shape; their base is very flexible, 

 A fairly large compressed dewlap hangs from posterior part of throat, 

 10 mm. from middle of base to top, the base along middle of throat 

 being about 30 mm.; scales on throat and dewlap smaller than ven- 

 tral scales, all smooth; scales of fore limbs normal; those of hind 

 limbs larger, some of those of femur and tibia enlarged and slightly 

 spiniferous. Femoral pores 9-9; tail not constricted at insertion; 

 caudal scales above and laterally in whorls of large spinous scales, 



