Oil a new Snake from the Andes of Culombia. 523 



13. ^feIalnpus fasci'aiuftj Deshayes. 

 Hoth banJeJ and plain varieties. 



Family Melaniidse. 



14. Melania Mageniy Gassies. 

 FUe the late Dr. Brot. 



Family Littorinidae. 



15. Littorina ohesa^ Sowerby. 



16. Littorina vndulata, Gray. 

 17. Littorina intermedia, Philippi. 



LXin. — Description of a new Snake from the Andes of 

 Colombia. By G. A. BoULENGEU, F.E.S. 



Leptognathus Pratti. 



Body stroiif];ly comj)resse(l. Eye moderately large, its 

 diameter equalling its distance from the oral border. Rostral 

 as deep as broad, just visible from above; internasals about 

 lialt" as long as the pra3frontals ; 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; prseocular partially 

 fused with the prajfrontal ; 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. Ventralsl73; anal entire : subcaudals 71. Dark 

 brown above and below, with paler brown cross-bars, one 

 scale wide, disposed in pairs ; belly with interrupted liglit 

 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 



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