1 30 Bulletin of Laboratories of Denison University [Voi. xi. 
ScelopOrUS GratioSUS, Baird and Girard. 
Description : Head and body somewhat depressed; nostrils 
opening much nearer to the end of the snout than to the or- 
bits; uppear head shields smooth, moderately large, and slight- 
ly convex, interparietal largest; frontal usually divided trans- 
versely; parietal, frontoparietal and frontal plates separated 
from the supra-occulars by a series of small plates of granules; 
superciliaries long, wide, and strongly imbricated; middle sub- 
occular very long, narow strongly keeled; rostral plate very 
wide and rather high; labials long, low, and almost rectangular; 
below lower labials series of large sublabial plates; symphyseal 
arge, pentagonal; gulars small, smooth, imbricate, frequently 
emarginate posteriorly, about the size of the ventrals; ear open- 
ing large, slightly oblique, with an anterior armature of from 
four to seven accuminate scales; dorsal scales equal, keeled, 
pointed, and arranged in longitudinal parallel rows; scales on 
sides similar to those of the back, but directed obliquely up- 
ward; no longitudinal dermal folds; superior surfaces of the 
limbs with keeled scales; posterior surfaces of thighs with small 
smooth scales; ventrals smooth but usually bicuspid; caudal 
scales very much larger than the dorsals, heeled and strongly 
pointed; femoral pores varying in number from twelve to 
twenty; eleven to seventeen dorsal scales equal in number to 
the shielded portion of the head; scales in the longitudinal row 
from parietal plate to a line connecting the posterior aspects of 
the thighs varying from 45 to 66; males with enlarged postanal 
plates. 
Color : above, brown, olive or bluish or greenish gray ; 
with one dorsal and two lateral series of closely set brown spots 
on each side, spots sometimes more or less confluent, forming 
longitudinal bands separated by narrower bands of the lighter 
ground color; tail usually with trace of darks rings; males with 
a blue spot, sometimes bordered with black, on each side of the 
belly; throat more or less washed with blue which has a ten- 
dency to form narrow oblique lines. 
This species is closely related to S. consobrinus, but is 
smaller. It occurs in the mountains of California, Utah and 
