1911] Bryant: Horned Lizards of California and Nevada 45 
median line; peripheral spines in one row, disappearing poster- 
lorly ; back and tail with several rows of enlarged, weakly keeled, 
spinose scales set among finer scales and granules; ventral scales 
smooth; tail conical and attenuated and fringed with a row of 
conical seales; tympanum usually entirely covered with scales; 
femoral pores few (7-8). 
Description—The short wide head is somewhat smaller than 
is found in the other species (pl. 6, fig. 13). The two occipital 
horns are of medium size (4-9 mm.), flattened and grooved. 
An interoccipital is represented by an enlarged scale. The 
nostrils are situated above the lines joining the supercilary 
ridge with the end of the snout. The series of temporal horns 
numbers five to seven on each side. The posterior two or three 
are the best developed, the others being mere tubercles. The 
posterior ones point almost in the same direction as the occipitals. 
The head shields are small and flat, with the exception of three 
enlarged seales in front of the occipital horns, and are rough- 
ened by granules and ridges. The suprarorbital regions are 
swollen. The infralabials are nearly equal in size and are acutely 
angular. Below them and separated from them by a row or 
two of small scales is a series of large, spinose, sublabial plates 
which increase in size posteriorly (pl. 6, fig. 14). No enlarged 
subrictal spine is present. But one row of peripheral spines 
fringes the body. One row of enlarged gular seales, distant 
from the median line, is present (pl. 6, fig. 14). There are 
two groups of enlarged scales on each side of the neck, the lower 
being the larger. The back and tail are covered with several 
rows of large, weakly keeled, spinose scales, set among finer 
scales and granules. A rosette of scales surrounds these larger 
ones. The ventral scales are smooth. The conical tail is atten- 
uated and is fringed by a row of widely separated, conical spines. 
The limbs are long in comparison with those of other species, 
and the arm and thigh are fringed anteriorly by a row of en- 
larged, keeled scales. The tympanum is usually covered with 
scales, but this character is not constant. A row of widely sep- 
arated, conspicuous femoral pores, seven to ten on each side, 
invades the preanal region. Males have enlarged postanal plates 
(pl. 5, fig. 14). See table of measurements for dimensions and 
proportions of the lizard. 
