472 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Rostral forming a trifle more than a right angle behind; nostril 
between the two nasals; anterior pair of nasals moderately in contact 
behind rostral; frontonasal longer than wide in contact with the loreal; 
 prefrontals also moderately in contact; frontal in contact with only 
the first two supraoculars; a pair of frontoparietals separated, except 
anteriorly, from the third supraocular by one or two rows of granules; 
three large occipitals in a transverse row, with a pair of intercalated 
scales between the outer pair and the frontoparietals; five and six 
supraciliaries, the third very long; three supraoculars the first in 
contact with the two anterior supraciliaries, separated from the loreal; 
two posterior supraoculars separated from the supraciliaries by a 
single, partly double row of granules; last supraoculars separated 
from the outer occipitals by two, partly three rows.of granules; six 
and seven supralabials; five and six large infralabials; between 
infralabials and chin-shields a wedge of two rows of scales, extending 
anteriorly as far as the middle of the second chin-shield. Chin and 
throat covered with granules, a band of larger ones extending across 
the middle, a group of ten or a dozen very large ones in the mid-region 
of which no one scale is much larger than another; on the area between 
the two throat folds a single row of large scales; under side of the 
body with eight longitudinal and twenty-eight transverse rows of 
plates; preanal plates in a median longitudinally arranged pair and a 
marginal transverse pair, the former larger. On the lower arm one 
row of very large antebrachials becoming double proximally; on the 
upper arm one row of very large brachials continuous with the ante- 
brachials; on the posterior side a group of small postbrachials; under 
side of the thighs covered distally with three rows of very large plates 
resolving proximally into six or eight rows; twenty-four and twenty- 
five femoral pores; on the under side of the tibia two, part three rows 
of very large shields; upper side of the wrist covered with three large 
scales and several smaller ones; inner and outer toe reaching approxi- 
mately the same point; tail covered with keeled scales, the keels 
parallel with the longitudinal axis but the scales oblique; each whorl 
of caudal scales raised strongly on the sides, giving the tail a peculiar 
flattened appearance; about twenty-two scales in the fifteenth ring 
from the base. 
Coloration: — Dorsal surface dark olive-brown, on each side, 
covering nearly the entire surface of the flanks a series of large vertical 
bars of black; these spots somewhat confluent, with the between 
spaces gray instead of brown like the back; indistinct mottlings of 
gray on the upper surfaces of the legs; ventral surface milky tinged 
with straw-color; outer ventrals, under surfaces of the legs reticulated 
with blue-gray. 
Variation: — A half grown male M. C. Z. 9932 is not so distinctly 
marked as the adult, but the general pattern is the same. 
