382 PROCEEDINGS OF THE NATIONAL MUSEVM. vol.xxi. 



larger ones; ninth is suddenly larger and tenth still larger, equaling the 

 largest; the spines are very compressed, about 8..) mm. (0.325 inch) iiigh 

 and 3.8 mm. (0.15 inch) wide at base, and falcate in shape; their base 

 is flexible and covered for about one-fourth of their height with two to 

 three rows of minute scales; the last 12 spines decrease gradually 

 in size, the last being equal to the first ones on the nape; about 10 

 small carinated scales follow until the caudal crest begins; three 

 transverse dermal folds across the throat, which, with a similar one 

 behind the ear, join two longitudinal folds on the side of the neck; 

 these extend backward over the shoulder for some distance; between the 

 anterior and posterior transverse gular folds a large compressed dew- 

 lap 32 mm. (1^ inches) from middle of base to top, the base along the 

 middle of the throat being about 38 mm. (1^ inches); scales on throat 

 and dewlap slightly smaller than the ventral scales, all smooth ; scales 

 on upper side of arm obtusely cariuate, those on lower arm slightly 

 larger, more distinctly carinate and somewhat spinous at tip; scales on 

 femur slightly larger than the ventral scales, those on the upper sur- 

 face obtusely keeled and with a small pointed tubercle at tip; scales on 

 upper middle portion of tibia greatly enlarged, more or less regularly 

 hexagonal, each with a falcate spine near center; scales on upper side of 

 hind feet toward toes enlarged, keeled and spinous; 7 large femoral 

 pores on each side; tail somewhat constricted at insertion, much de- 

 pressed at base, becoming subcylindrical posteriorly; caudal scales 

 above and laterally in whorls of large spinous scales, separated by a sin- 

 gle row of smaller flat scales, the central one being spinous, however; in 

 the spinous row the median scales are shortest, the lateral ones longest, 

 while in the smaller and smooth row the proportion is reversed, so that 

 the anterior outline of the large row is concave and the posterior out- 

 line of the srpall row convex ; the outlines of each pair of rows per- 

 fe(;tly straight; in the spinous row the scale on each side of the central 

 one is without a spine; the lateral spines are straight, the central ones 

 falcate; the median spines form a caudal crest, in the basal half of 

 which the spines alternate large and small, according to whether they 

 belong to the large or small row; caudal scales below much smaller, 

 three rows corresponding to each pair above, strongly keeled and 

 pointed posteriorly. 



Color, green with yellow variegations on throat, dewlap, and lateral 

 folds; dorsal crest pale yellowish; on the body several ill defined, 

 chevron-shaped blackish bands, which do not cross the dorsal crest, 

 but the posterior three of which reach the abdomen; tail marked with 

 broad bands of dull blackish brown. 



Measurements of type specimen of Ctenosaura palearis. 



mill, inches. 



Total length 429 = lb.9 



Tip of snout to front of ear opening 41^= 1.6 



Width of heart at front of ear opening 29= 1.15 



Lengtli of tail 231= 9.1 



Forelinib 69= 2.7 



Hind limb 216= 8.5 



