4 
160 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
lower edge of the ear three large tubercular shields in a horizontal 
row; above them along the edge of the ear three or four rows of smaller 
scales, strongly tubercular and grading off in size anteriorly; below 
the angle of the mouth a few scattered enlarged scales, each surrounded 
by a circle of granules; seven lower labials to the center of the eye; 
a row of enlarged malar scales, the posterior ones strongly keeled and 
separated from the infralabials by a single row of fairly large scales 
of which the posterior ones are also keeled; dorsal and ventral scales 
small, about thirteen contained in the vertical diameter of the tym- 
panum; from the nuchal fold along the median line of the neck and 
back a series of medium sized spines, not interrupted or greatly re- 
duced on the shoulders, and only decreased in size on the rump; the 
longest spines about a centimeter in length; fifty spines in the crest 
from the shoulders to the rump; upper surface of the limbs with 
slightly imbricated, keeled, posteriorly pointed scales somewhat larger 
than the dorsals; on the lower arm about eleven, on the upper about 
fifteen of these scales to the vertical diameter of the tympanum; a 
single series of eighteen femoral pores; inner side of second toe with 
one comb, of the third toe with two combs, each consisting of three 
large and two small lobes; tail compressed, covered with obliquely 
keeled scales in vertical rows forming distinct verticils; tail sur- 
mounted by a row of spines slightly larger than, but continuous with, 
those of the body-crest. 
Coloration: — Ground tone of dorsal surface brownish gray, almost 
a mud color; top of snout, sides of head washed with green; lower 
labials yellowish green; dorsal and lateral surfaces of the body faintly 
blotched with straw color, the blotches often breaking up into groups 
of small spots; upper surface of the thighs, sides of tail profusely 
blotched with the same color; ventral surface muddy gray; the legs 
tinged slightly with green. 
Material examined. 
The specimen described. 
CYCLURA CORNUTA (Bonnaterre). 
Plate 10. 
Bonnaterre, Tabl. encye. erpet., 1789, p. 40, pl. 4, f. 4. Stejneger, 
Rept. U.S. N. M. for 1902, 1904, p. 670, f. 122-126. 
