180 ON THE REPTILIA OF PERU. 



This whip-snake is allied to the Drymobius boddcertii, especially to the pale- 

 banded variety. It is a more slender species, with narrower head plates, espe- 

 cially the frontal and loreal. 



Obtained in the valley of Jequetepeque, Peru, by Doctor Edwin R. Heath, to 

 whom I take great pleasure in dedicating the species, as a testimony to his dis- 

 interested zeal in advancing natural history. 



61. Drymobius boddjErtii, Seetz. 

 From the lower Amazon. 



62. Spilotes piceus, Cope, Proceedings Academy Philada. 1868, 105. 



From the Maranon. Adult and young, the latter with narrow white cross- 

 bands, as in the species of Drymobius. 



63. Spilotes pullattts, Linn. 



64. Xenodon colubrinus, Gthr., Catalogue B. M. p. 55. 



65. Tachymenis ohilensis, Schleg. Giinther, Catal. p. 34. 

 From Lake Titicaca. 



66. Opheomorphus merremmii, Wied. 



67. Lygophis pcecilostomus, sp. nov. 



Scales in nineteen rows, poreless ; anal plate divided, dentition diacranterian. 

 Frontal shield with concave sides, nearly as wide behind as before, twice as long 

 as wide, its length one-half greater than that of the muzzle in front of it. Ros- 

 tral little visible from above ; postnasal higher than prenasal ; loreal oblique, 

 higher than long. Oculars 1-2, the preocular scarcely reaching frontal ; temporals 

 1-2. Superior labials eight (nine on one side), fourth and fifth in orbit. Inferior 

 labials nine, six in contact with geneials. Postgeneials the longer. Gastrosteges 

 206 ; urosteges 89. 



Color above ashen-brown, with a series of short, dark, brown cross-bands, 

 extending across seven or eight scales, and separated by two rows of scales. These 

 break and alternate on the middle of the length, and then form a serrate band, 

 which is on the tail a uniform longitudinal band. Lips and chin spotted with 

 brown ; belly ashey. 



Valley of Jequetepeque. 



This snake is somewhat like the Liophis chamissonis, but belongs to another 

 genus. 



68. Liophis regin^, Linn. 



69. Liophis almadensis, Wagler. 

 From the Solimoens. 



