CROCODILIANS, LIZARDS, AND SNAKES. 



815 



Fig. 182. 

 Zamenis t^niatus Hallowell. 



= 1. 



Little Colorado River, Arizona. 



Cat. No. 43*4, U.S.N.M. 



ZAMENIS TiENIATUS Hallowell. 



Zamenis ianiatus Boulenger, Cat. Snakes Brit. Mus., I, 1893, p. 390. 

 Leptophis tcemata Hallowell, Proc. Acad. Nat. Sci. Phila., VI, 1852, p. 181. 

 Masticophis tceniatus Baird and Girard, Cat. N. Amer. Kept., 1853, p. 103. 

 Bascanium twniatum Cope, Check-list N. Amer. Batr. Kept., 1875, p. 40. 



Form very slender ; head distinct. Muzzle not elongate nor decurved, 

 somewhat flattened; the apex slightly protruding. Eye rather large. 

 Tail a little less than 

 one-third the total 

 length. Eostral plate 

 slightly recurved on 

 the summit of the muz- 

 zle. Internasals wider 

 than long. Frontal at 

 the narrowest part 

 equals one half the 

 width of the supercili- 

 ary. Parietals openly 

 emarginate, truncate 

 behind. Loreal longer 

 than high ; postoculars 

 two; temj)orals 2-2-2. 



Superior labials eight, the fourth and fifth bounding the orbit below ; 

 the sixth snbtriangular, the apex sometimes reaching the inferior pre- 

 ocular; the seventh largest. Inferior labials nine, the fifth the largest. 

 Postgeneials a little larger than pregeneials. Scales in fifteen longi- 

 tudinal rows, those on the anterior two-thirds of the body elongate, 

 those following, wider. 



Baird and Girard give the following scutal formuljB and measure- 

 ments, the latter in inches: 



California; gastrosteges, 209 -{- 1 ; urosteges, 157; total length, 108; tail, 14. 



I add the following, measurements in millimeters: 



Provo, Utah; gastrosteges, 207 + 1 ; urosteges, 138; total length, 1100 ; tail, 337. 



A longitudinal dorsal band, six and two half-scales wide, olive-brown, 

 each scale with a rather deeper spot in the center; the four and a half 

 scales on each side of this band yellow, each row with a narrow brown 

 stripe through its center, fading out in the tail. There are thus five 

 (lark stripes on each side, the fifth above margining the dorsal band. 

 Of these stripes, the first and third are narrow, each showing a stripe 

 of yellow of the same size on each side of it; the second and third are 

 closer to eacli other and broader. Beneath yellowish, with a distinct 

 dark stripe on each side, just witliin the external row of dorsal scales. 

 The scutellne otherwise immaculated, except a few scattered dots 



