CROCODILIANS, LIZARDS, AND SNAKES. 



805 



inferior surface does not generally take part in the darkened color 

 indicates a normal color type. 



Zamenia flagellum picetia Cope. 



ZAMENIS SEMILINEATUS Cope. • 

 Bascayiiiim semiUnealiim Cope, Proc. U. S. Nat. Mns.. XV, 1892, pp. 622-626. 



This is a remarkable form, as it oc(;upies a position between several 

 of the species. Thus it has the scale formula and shape of head of 

 Z. Jiagellum, the head coloring of Z. schottii, and part of the coloration 



Fig. 176. 



ZAMENIS SEMILI;.EATns COPE. 



Colorado River, Arizona. 



Cat. No. 1981, U.S.N. M. 



between those of Z. twniatuni and Z. lateralis, and part like that of 

 Z.flaf/elhon. Its adult characters ally it most nearly to the last named, 

 but its appearance is quite distinct. 



The scales are in seventeen rows, and there are eight superior labials. 

 The posterior part of the frontal is only half as wide as the superciliary 

 plate at the same point. The temi)oral scales are 2-2-2. The fourth 

 and fifth labials bound the orbit below. The loreal is larger than liiiili. 

 The postgeneials are a little larg^er than the pregeiieials. The muzzle is 

 not decurved, and is moderately protuberant, viewed in profile; from 

 above it is elongate wedge-shaped. The tail is long, entering the total 

 length in the specimen before me (Cat. No. 1981) three and one-seventh 

 times. 



The general color is a light brownish clay-color (in spirits), the free 

 border of each scale with an elongate whitish spot on each side. The 

 color becomes darker anteriorly so as to be on the anterior fourth of 

 the length, a plumbeous green, with the top of the head light brown. 



