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. 



