Art. VI.] Herrick-Terry-Herrick, New Mex^co Lizards. 135 
uted; a single row of sharp spines along the sides; tail with a 
lateral and two dorsal rows of spines; scales on the breast, belly 
and proximal aspect of the tail smooth, but those on the ter- 
minal part of tail keeled; in a large specimen the latter bands, 
as well as the blotches of dark on the back often indistinct; 
lower surfaces pure white. 
Measurements: Length of anus, 40 mm.; tail, 20 mm.; 
snout to eye, 10 mm.; width of head, 16 mm.; length of oc- 
cipital spine, 3 mm.; fore leg, 25 mm.; hind leg, 35 mm.; base 
of fifth to end of fourth toe, 10 mm. 
Sp. 2. Phrynosoma Cornutum, (Harlan) Gray. 
Plate XIX, Fig. i6. 
This seems to be the commoner form in the valley of the 
Rio Grande. 
Description : Head as broad or broader than long; nostrils 
opening the canthi rostrales; tympanum naked; gules scales 
keeled, with a longitudinal series of enlarged pointed scales on 
either side of neck; gular folds several, irregular, a series of 
very large projecting sublabial scales; infralabials head spines 
large, the occipital being much larger than the three temporals 
and directed obliquely upward and outward; interoccipital and 
postorbital present. 
Back with very large erect spinose tubercles, the longest 
of which form a series of three or four on either side the ver- 
tebral line; two lateral series of spines of which the upper are 
longest; pectoral and ventral scales more or less distinctly 
keeled; femoral pores twelve on a side not extending upon the 
preanal' region; no enlarged postanal scales. The body is one 
and a half times as long as the tail. Scales of head pustulose 
or longitudinally striate, spines ribbed. 
Dorsal surface of head isabelline brown, mottled with white 
with two black cross bands between the canthi rostrales, a band 
from the eye to the angle of mouth, another black band from 
eye to temporals, about the mouth and cheeks ochraceous 
brown; under parts of head mottled with black as also the lat- 
eral margins of body below; dorsal surface with 4 longitudinal 
