n. COLUBRIDJE 



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. 



Length to anus -468 512 572 588 590 



Length of tail 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 A — 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 j the average in four females is 74.5. 



