854 13. COLUBRID 
extends up behind the labials and temporals. The chin 
and throat are yellow or whitish. The belly is greenish 
yellow. 
A specimen from Tucson, Arizona, was colored in life 
as follows: The head above is clear olive. The supra- 
labials are straw yellow, the anterior and posterior ones 
tinged with olive, and all showing posterior edgings of black. 
The oculars are yellowish olive. The dorsal line is bright 
ochre anteriorly, becoming dull yellow on the posterior half 
of the body. The lateral lines are olive yellow on the neck, 
but posteriorly become grayish yellow and then cream or 
grayish white. Nuchal blotches are blackish, but are not very 
evident. The area between the dorsal and lateral lines is 
clear olive brown, with two rows of nearly concealed black- 
ish blotches separated by concealed light greenish white 
areas on the skin between the scales. The lower laterals 
and tips of the gastrosteges are olive brown, a little lighter 
than the area between the stripes. The lower surfaces are 
yellowish white on head and neck, grayish or olive white 
elsewhere, the gastrosteges with concealed black markings 
laterally. 
Men pthito vanes es oe 468 512 572 588 590 
enpthy of ital 152 152 184 168 
Variation.—In six specimens from Arizona the loreal is 
1—1 in all. The preoculars are 1—1 in all. The post- 
oculars are 3—4 in three, 3—3 in two, and 4—4 in one. 
The temporals are 1+2—1+2 in three, 1+3—1+3 in two, 
and 1+2—1+3 in one. The supralabials are 8—8 in four 
and 8—9 in two. The infralabials are 10—10 in all six. The 
scale-rows are 21—19—17 in five, 21—23—21—19 in one. 
The gastrosteges vary in number from 154 to 162; the 
average in five females is 158.8. The urosteges vary from 
72 to 77; the average in four females is 74.5. 
