24 University of California Publications in Zoology [Vou.% 
an interoccipital. A series of four or five temporal horns are 
found on each side. One row of peripheral spines fringes the 
small body. The tail is enlarged near its base and then narrows 
suddenly into a short cylindrical part. It is fringed by a row 
of conical scales and is covered dorsally and ventrally by the 
same sort of scales as are found on the back and belly. The 
nostrils are situated on the line joining the superciliary ridge 
with the end of the snout. The muzzle is almost vertical. The 
cular scales are of equal size (pl. 3, fig. 8). The head is obtusely 
triangular, broader than long, and the superciliary region is 
strongly marked. Seales of the row on the margin of the super- 
ciliary ridge are enlarged, the central one acting as a keystone. 
The infralabial seales are larger than the supralabials, the 
last four to six being enlarged and pointed, forming a row of 
subrictals. At the rictus is situated an enlarged, conical scale. 
The limbs are short. The enlarged dorsal scales are arranged in 
several rows but are not conspicuous. They are not surrounded 
at their base by a rosette. The abdominal scales are smooth and 
acute. Long series (usually sixteen) of conspicuous femoral 
pores approach the median line invading the preanal region. 
Males usually have enlarged postanal plates. See table of 
measurements for dimensions and proportions of the lizard. 
The coloration varies greatly, the commonest being ashy to 
brown with several rows of dark blotches. The neck patches are 
narrow and widely separated (pl. 1, fig. 1). The tail and limbs 
are obscurely cross-banded. A faint, central white lne runs 
from the occiput to the tail. The ventral surface is usually 
spotted as is also the gular region. For general color pattern 
see plate 3, figure 7. 
OSTEOLOGY 
Diagnostic Characters: Horns of occipital region rudimen- 
tary and widely separated; supratemporal horns extending pos- 
teriorly to them; nasals with short, obtuse processes over nostrils ; 
spines on jugal elements lacking; postorbitals with broad articu- 
lating processes turned at right angles to each other; quadrates 
long with deep conchs; the epipterygoids run along the petrosal 
