77. XK50DON. 147 



*, l-m. $ (V. 14'.>. U7; Panama. Christiania Museum. 



C. 46, 44) & yg. (V. 



H:i: T. 49). 

 n. $ (V. 144 ; C. 39). San Geronimo, Qua- 0. Salvin, Esq. [C.]. 



temala. 

 o-o. Y*. CV. 131, 132; British Honduras. Dr. Giinther [P.I 



C. A 41). 

 q. Yg. (V. 132 ; C. 42). Amula, Guerrero. F. D. Godman, Esq. [P.]. 



2. Xenodon suspectus. 

 Xenodon suspectus, Cope, Proc. Ac. Philad. 18G8, p. 133. 



Maxillary teeth 14 + 2. Head moderately depressed. Rostral 

 shield once and one third as broad as deep, the portion visible from 

 above measuring one fourth its distance from the frontal ; internasals 

 a little broader than long, shorter than the praefrontals ; frontal a 

 little longer than broad, as long as its distance from the end of the 

 snout, as long as the parietals ; loreal deeper than long ; one prae- 

 and two postoculars ; temporals 1 + 2; eight upper labials, fourth 

 and fifth entering the eye ; four lower labials in contact with the 

 anterior chin-shields, which are a little larger than the posterior. 

 Scales in 19 rows. Ventrals not angulate laterally, 134-141 ; 

 anal entire ; subcaudals 35-40. Olive above, with broad dark 

 black-edged cross bars contracted or interrupted in the middle ; 

 upper surface of head with black dots ; sides of head black, with a 

 few yellow dots ; chin and throat black, spotted with yellow ; belly 

 dark brown, with yellow spots on the sides. 



Total length 650 millim. ; tail 100. 



Upper Amazon. 



a. J (V. 141 ; C. 40). Moyobamba, N.E. Peru. Mr. A. H. Roff [C.]. 



3. Xenodon gnentheri. (PLATE VII. fig. 1.) 



Maxillary teeth 13 + 2. Head moderately depressed. Rostral 

 shield as deep as broad, the portion visible from above as long as 

 half its distance from the frontal ; internasals broader than long, 

 shorter than the pnefrontals ; frontal longer than broad, as long 

 as its distance from the end of the snout, as long as the parietals ; 

 loreal deeper than long ; one prae- and two postoculars ; temporals 

 1+2 ; eight upper labials, fourth and fifth entering the eye ; four 

 lower labials in contact with the anterior chin-shields, which are 

 larger than the posterior. Scales in 19 rows. Ventrala obtusely 

 angulate laterally, 170 ; anal divided ; subcaudals 57. Above 

 with dark brown, blackod-edged, angular, transverse spots separated 

 by narrow pale interspaces ; nape with an elongate rhomboidal dark 

 brown spot with a central longitudinal light streak ; head with 

 three dark brown angular transverse bands, the middle one across 

 the interorbital space and passing through the eye ; belly yellowish 

 with largo black transverse spots. 



L2 



