1 24 Bulletin of Laboratories of Denison University [Voi. xi. 
the series, keeled; rostral plate narrow, nearly rectangular; labials 
low, upper and lower subequal ; symphyseal plate large, pen- 
tagonal, followed by a series of plates larger than the gulars, 
not separated from the lower labials, the latter, however, in a 
double row ; gular scales smooth, flat, bicuspid, strongly im- 
bricated ; those of a median portion of the belly not toothed, 
toward the sides first becoming bicuspid, then strongly denti- 
culate ; passing gradually into the dorsals ; ear opening large, 
nearly vertical, protected by a small series of acuminate scales, 
only two of which are specially modified ; scales of back broad, 
equal, slightly keeled, short-pointed and serrate, in longitudinal 
series but converging backward toward the median line ; dorsals 
of the lumbar region, smaller than the caudal scales; scales of 
the sides pointing obliquely upward ; no longitudinal dermal 
folds ; a transverse gular fold behind the ear opening ; upper 
surfaces of limbs covered with strongly keeled and long-pointed 
scales ; scales on the posterior surfaces of thigh similar ; upper 
caudal scales not serrate, strongly spined, spines directed 
obliquely outward ; femoral pores varying from eleven to thir- 
teen or more ; six to ten dorsal scales equal in length to 
shielded part of head ; number of scales from the interparietal 
to a line drawn through the posterior surface of thighs about 
30; males with enlarged post-anal plates; tail as long as head 
and body. 
Color : upper parts olivaceous brown, head darker ; black 
collar in front of shoulders ; distinct, nearly complete rings of 
dark on tail ; back with dark, broad, irregular inconspicuous 
bands ; male much darker than female ; under side of throat 
bluish grey, in the male darker and more highly colored ; bluish 
longitudinal bands on either side of abdomen in both sexes, 
merging into a dark spot in front of the thighs ; under parts 
yellowish white ; spines of upper surfaces of limbs dark-tipped. 
Measurements: Total length, 215 mm.; Length to anus, 
105 mm.; Length of tail, no mm.; Snout to ear, 26 mm.; 
Width of head, 27 mm.; Fore leg, 42 mm.; Hind leg, 70 mm.; 
Base of fifth to end of fourth toe, 20 mm. 
This species has been found living upon rocks at an eleva- 
