466 5. AN NIELLI DM 



a pair of large prefrontals. Behind large frontal, a single 

 very broad frontoparietal, its posterior margin notched to 

 receive a small interparietal with which it frequently unites. 

 On each side of interparietal, a small parietal, and behind 

 these usually two small occipitals separated by an interoccipi- 

 tal. A large supraocular precedes several smaller plates. 

 A large preocular with, usually, a smaller one below it. 

 Nasal large, sometimes divided, extending to margin of lip, 

 but small first supralabial plate may be seen below it. Sup- 

 ralabials usually six, second largest. Symphyseal large, 

 followed by several pairs of large sublabials. Infralabials 

 five to seven, smaller than supralabials. Dorsal, ventral, 

 lateral and caudal scales all similar, slightly largest on tail 

 and smallest on neck, strongly inbricate, rounded in poste- 

 rior outline, and perfectly smooth. Preanal scales not en- 

 larged, slightly enlarged, or twice as long as those preced- 

 ing them. Number of longitudinal series of scales around 

 body varying from 24 to 34. 



The color above is yellowish white or silvery or drab 

 gray, with one distinct longitudinal brown line down the 

 middle of the back, and one or more similar lines along 

 each side. Very narrow brown zigzag lines usually run 

 along the margin of the other series of dorsal scales. These 

 lines are sometimes quite yellowish, sometimes nearly black. 

 The lower surfaces are yellowish white, frequently suf- 

 fused with brown, slate or gray on the chin, throat and tip 

 of tail, and often showing narrow zigzag longitudinal lines. 

 The entire upper surface of a specimen from San Bernar- 

 dino is slightly suffused with olive-gray. 



Length to anus 84- 



Length of tail +4 



Width of head 4 



Head to interparietal 4 



Diameter of body 4 



