32. ARIZONA 703 
top of head, a pair of internasals, a pair of prefrontals, a 
frontal, supraocular of each side, and a pair of large parie- 
tals. Anterior and posterior nasals usually distinct, but 
sometimes united above nostril. Loreal elongate. One or 
two preoculars and two or one postoculars. Temporals 
normally two followed by three, sometimes 2+4 or 2+5, 
lower scale of first row often elongate. Eight, or rarely 
seven or nine, superior and 11 to 15, usually 13, inferior 
labials, sixth or seventh superior and seventh or eighth in- 
ferior usually largest, fourth and fifth superior normally 
reaching eye, first pair of inferior meeting on median line. 
Two pairs of genials, posterior narrower and shorter or but 
little longer than anterior. Scales on body smooth, thin, 
in 27 to 31 rows. Anal plate not divided. Gastrosteges 
varying in number from 209 to 227. Urosteges in two 
series of from 45 to 59. 
The ground color is pale brown or yellowish gray, 
lighter near the middle of the back, along which is a series 
of dark-edged brown or gray blotches. The sides are marbled 
with similar but smaller blotches in more or less alternating 
rows. The tail is similarly colored. In young, a dark 
streak runs from the eye, to the corner of the mouth, and 
another between the eyes, crossing the posterior edges of 
the prefrontal plates as in Pituophis. These streaks are faded 
or absent in adults. The lower surfaces are a beautiful pale 
yellowish white, without markings. 
The colors in life of an adult male taken at Yuma, March 
19, 1912, were as follows: The head is light olive with 
darker olive markings. The lower surfaces and two or 
three rows of lateral scales are white. The scales between 
the blotches on the sides and along the middle of the back 
are yellowish with whitish edges and with reddish brown 
markings near the base of each scale. The dark blotches are 
in part blackish brown, in part deep olive. 
