158 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
the suboculars; no tubercular or swollen scales in the temporal 
region, only a few enlarged scales below the angle of the mouth, 
eleven infralabials to the middle of the eye; a double row of small 
slightly keeled malar scales separated from the infralabials by one 
or two rows of scales of the small size; dorsal and ventral scales 
small; from the nuchal fold along the median line of the neck and back 
a row of blunt spines; on the neck the spines about half a centimeter 
high; the crest broadly interrupted on the shoulders and rump; 
forty-seven spines in the dorsal crest between these two points, the 
first four and the last four spines of this series very much reduced, 
the largest spine about three millimeters high; upper surface of limbs 
with slightly imbricated, keeled, posteriorly pointed scales consider- 
ably larger than the body-scales; on the upper arm about twenty on 
the lower arm about twelve of these scales to the vertical diameter 
of the tympanum; twenty-three femoral pores; inner side of second 
toe with one comb, of third toe with two combs each consisting of 
three prominent and two small lobes; tail compressed, covered with 
obliquely keeled scales in vertical rows, forming distinct verticils; 
the limiting row of each verticil formed of strongly keeled scales; 
tail surmounted by a serrated crest, similar to the body-crest but 
formed of larger and sharper spines. 
Coloration: — Ground tone of dorsal surface brownish gray; numer- 
ous but very faint yellow-brown reticulations extending from head to 
tail; these reticulations forming faint yellowish blotches on the head; 
tail uniformly yellowish gray; sides of head and gular region tinged 
with blue; chest smoky; rest of ventral surface the same color as tail. 
Material examined. 
The specimen described. 
CYCLURA COLLEI Gray. 
Plate 9; Plate 15, fig. 5, 6. 
Gray, Cat. lizards British mus., 1845, p. 190. Barbour, Mem. 
M. C. Z., 1914, 44, p. 298. 
Diagnosis: — Nasals separated from the rostral by several rows of 
fine granules. Prefrontal region covered by a series of three large 
shields on each side, each shield slightly swollen and convex; the 
