458 Dr. E. Loniibevg on Snakes from 



Fortin Ci-fivaux. Bolivian Chaco near Pilcomajo : cliy 

 woods with spiny Mimosaceai &c. 



Tataienda, Caiza, Bolivian Chaco : on the border between 

 the dry woods and the subtropical forest, partly broken up in 

 groves separated by grassy areas, 



Drymohius bifossatus, Baddi. 

 Four specimens from Tatarenda, Bolivian Chaco. 



Lfptophis rostraViSj sp. n. 



A young specimen of this genus seems to represent a 

 hitherto unknown species, and I name it therefore, at least 

 provisionally. It does not agree with any of the descriptions 

 in the literature, but might perhaps turn out to be the young 

 stage of some other species, although that, too, does not seem 

 probable. 



The loreal is absent, the obliquely disposed scales are 

 smooth and arranged in fifteen rows. The ventrals are 

 distinctly angulate laterally. The rostral is broadly visible 

 from above. Already the combination of these characteristics 

 seems to suffice to distinguish it from the hitherto known 

 species of Lfptophis, but a full description will make the 

 distinction still more plain. 



Head moderately elongate, a little more than twice as long 

 as broad. Eye rather large, its length equalling its distance 

 from the nostril. Rostral broader than deep, the portion 

 visible from above almost equalling two thirds the length 

 of the internasals. Internasals much shorter than prse- 

 frontals, about equalling two thirds the length of the latter. 

 Frontal about once and a half as long as broad, longer than 

 its distance from the snout, but shorter than the parietals. 

 Kasal elongate, semidivided. No loreal ; prgefrontal in 

 contact with second and third labials. One prgeocular, not 

 reaching the frontal; two postoculars. Temporals 1 + 1. 

 Eight upper labials, fourth and fifth entering the eye. Five 

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

 are a little shorter than the posterior. Scales in 15 rows, all 

 smooth, although in the posterior part of the body a faint 

 trace of a keel may be discerned on some scales of the median 

 and adjoining rows, more seldom on others. Ventrals dis- 

 tinctly angulate laterally, 167 in number. Anal divided; 

 subcaudals 148. General colour bronzy above, because the 

 scales are densely mottled with bronzy or golden, so that the 

 bluish (green) ground-colour is not conspicuous unless under 

 a magnifying-glass, and then mostly at the base. On the 



