On a new Snake from the Andes of Colombia. 523 
13. Melampus fasciatus, Deshayes. 
Both banded and plain varieties. 
Family Melaniide. 
14. Melania Mageni, Gassies. 
Fide the late Dr. Brot. 
Family Littorinide. 
15. Littorina obesa, Sowerby. 
16. Littorina undulata, Gray. 
17. Littorina intermedia, Philippi. 
LXIII.—Deseription of a new Snake from the Andes of 
Colombia. By G. A, BouLENGER, F.R.S. 
Leptognathus Pratt. 
Body strongly compressed. Eye moderately large, its 
diameter equalling its distance from the oral border. Rostral 
as deep as broad, just visible from above; internasals about 
half as long as the prefrontals; frontal as long as broad, 
shorter than its distance from the end of the snout, which 
equals the length of the parietals; nasal divided; loreal 
longer than deep, bordering the eye; preocular partially 
fused with the prefrontal; two postoculars ; temporals 2+3 ; 
eight or nine upper labials, fourth and fifth or fifth and sixth 
entering the eye; first two pairs of lower labials forming a 
suture behind the symphysial; two pairs of chin-shields, 
broader than long. Scales in 15 rows, vertebrals strongly 
enlarged. Ventrals 173; anal entire; subcaudals 71. Dark 
brown above and below, with paler brown cross-bars, one 
scale wide, disposed in pairs; belly with interrupted light 
longitudinal streaks. 
‘Total length 770 millim. ; tail 150. 
A single specimen (a female) was obtained by Mr. A. E. 
Pratt at Medellin, Republic of Colombia. 
35* 
