BARBOUR AND NOBLE: THE GENUS CYCLURA. 155 
broadly in contact in the middle line of the snout; immediately — 
following the supranasals and separated by a double row of scales, 
two large smooth prefrontals on each side, the posterior pair the 
larger; these scales between the prefrontals as large as the scales 
covering the frontal region; top of head behind the prefrontal region 
covered by small, irregular polygonal shields, those on the supraocular 
region much smaller than the others; three poorly indicated rosettes 
of larger scales, one on the frontoparietal region and one on each side 
of the occipital, each rosette consisting of a somewhat rounded scale 
surrounded by a circle of subrectangular scales; all shields on the top 
of head smooth or very slightly swollen, occipital somewhat larger 
than the adjacent scutes; superciliary shields slightly larger than the 
supraorbitals; the first two and the last two scales of this series some- 
what elongate, canthal scale preceded by a somewhat squarish pre- 
canthal of about the same size, a small subcanthal in contact with 
the canthal scale anteriorly; 2 loreal scales between precanthal and 
postnasal, squarish, not much smaller than precanthal; the rest of 
the loreal scales small and elongate, a series of strongly keeled subocu- 
lars not reaching the tympanum; temporal shields small; on the ante- 
rior edge of the tympanum just above the angle of the mouth a group 
of three or four large tubercular scales; below the angle of the mouth 
five regular rows of enlarged round scales, the series running obliquely 
forward; supralabials low, six to below the center of the eye. Lower 
labials larger than the supralabials, six to the center of the eye; two 
rows of large molar scales separated posteriorly from the infralabials 
by a single row of smaller scales; on each side of tlie jaws below the 
angle of the mouth five or six regular rows of rounded scales; dorsal 
crest interrupted on both shoulders and rump; nuchal section of the 
crest consisting of twenty spines all of about the same width, varying 
in height from one millimeter at the ends of the series to ten milli- 
meters in the center; back section formed of seventy-six spines scarcely 
over a millimeter in height, the last fourteen spines, however, over five 
millimeters in height; caudal section formed of heavy spines about 
four millimeters in height; scales on the upper side of the arms larger 
than the dorsal scales, those on the fore arm a trifle larger than those 
on the upper arm; a single series of twenty-three femoral pores; 
inner side of second toe with one “comb,” of third toe with two 
“combs” each consisting of three lobes; tail covered with faintly 
indicated verticils. 
Coloration:— Ground color bluish gray, heavily blotched with 
confluent tawny yellow markings; upper and lateral surfaces of head 
very pale yellow; tail and hind limbs darker than the rest of the body. 
