1911] Bryant: Horned Lizards of California and Nevada 55 
back and tail with several rows of large, weakly keeled, spinose 
scales set among fine granule-like scales; ventral scales smooth; 
tail flat, acute and bordered by a single row of conical spines, 
every second spine being of smaller size; tympanum entirely 
concealed with scales; femoral pores in long rows (17-20 on each 
side) invading the preanal region. 
Description.—The head is somewhat smaller than is found in 
other species (pl. 7, fig. 15). The snout is separated from the 
frontal region by a very prominent angle. The two occipital 
horns are long, smooth and conical, and are set close together. 
The nostrils are above the line joining the superciliary ridge 
with the end of the snout. There are five or six temporal horns 
on each side. The two posterior on each side are sharp and of 
about equal length. The head plates are polygonal, irregular 
in size and shape, with two enlarged plates just back of the 
pineal eye and one large one between the occipital horns. A 
eroup of enlarged scales is found on the front of the head at 
the angle with the snout. The supraorbital regions are swollen. 
The supralabials are somewhat spinose, giving a serrate appear- 
ance. The infralabials are small and flat; the sublabials large 
and acutely spinose (pl. 7, fig. 16). Those in the middle of the 
rows are usually the broadest and longest. No enlarged sub- 
rictal spine is present. One row of slightly enlarged gular 
seales, not reaching to the apex of the jaw, is found on each 
side of the gular region (pl. 7, fig. 16). Two small groups of 
conical spines are situated on each side of the neck. The back 
and tail present a much smoother appearance than that found 
in the other species. Several rows of large, weakly keeled, spi- 
nose scales are set among small granule-like seales. The en- 
larged scales are surrounded by a rosette of smaller ones (pl. 7, 
fig. 15). The ventral scales are smooth. The tail is very flat 
and tapers gradually to the tip. It is fringed by a row of conical 
spines, every second one of which is smaller than the preceding 
one. <A short row is also formed on the tail just behind the 
thigh. The arm and thigh are bordered anteriorly with a row 
of enlarged keeled scales. The tympanum is entirely covered 
with seales. The femoral pores are numerous (17-20) and the 
rows nearly meet medially (pl. 7, fig. 16). Males have enlarged 
