546 Mi: O. Thomas on neio 



confirms Dobson's views on tlie subject and also those I have 

 expressed in connexion with Vampyrops *. 



Saccopteryx infusca, sp. n. 



Similar in all essential respects to S. {Balantiopteryx) 

 plicata^ Pet., but rather smaller and less thickly built, much 

 darker in colour, \vitli decidedly narrower ears, less hairy 

 interfemoral, and no white line along the posterior edge of 

 the wing-membrane. 



Ears narrow, inner margin faintly concave in its upper 

 half; tip narrowly rounded otF; outer margin straight above, 

 slightly convex below. Interfemoral very thinly hairy as 

 far as the exsertion of tlie tail. 



Colour (from a skin) dark chestnut-brown above, scarcely 

 paler below. 8. plicata is slaty grey. 



Jjimensions of the type (an adult male in spirit) : — 



Forearm 41 millim. 



Head and body 42; tail 13; tail free from membrane 2"7; 

 ear 11*3; tragus on inner edge 3"o ; lower leg 16; calcar 14. 



IJab. Cachavi, N. Ecuador. Coll. W. F. II. Eosenberg, 

 5th Jan., 1897. 



S. plicata ranges northwards from Costa Rica to Sinaloa, 

 W. Mexico, while the new form apparently extends also to 

 Guatemala, as two bad specimens in the Museum from the 

 neighbourhood of Coban (coll. F. C. Sarg) seem to be refer- 

 able to it. 



Nectomys saturatus, sp. n. 



General size about as in the larger species of the genus, 

 f-uch as N. grandis, but the head, judged by the skull, seems 

 lo be larger and heavier. Colour above dark smoky grey- 

 brown, much darker than in any of the other species, espe- 

 cially along the centre of the back, where it approaches black, 

 owing to the very large number of shiny black-tipped hairs 

 mixed with the fur. Sides clearer grey, not unlike the dorsal 

 colour of Mus decumaiius. Belly rather more sharply defined 

 than usual, pale buffy, the bases of the hairs slate. Centre 

 of face blackish, continuous with the dorsal dark colour. 

 Ears rather short, their hairs blackish. Hands and feet 

 brown above, a few whitish hairs intermixed, the digits 

 nearly naked ; claws whitish. ^I'ail long, uniformly blackish 

 and thinly hairy above ; below, the longer swimming-hairs 

 along the middle line are white. 



Skull very stout and heavily built. Nasals broad in 

 front, evenly tapering backwards to a point barely as far 

 back as the level of the lacrymals, and but little surpassing 

 * Ann. & Mag. Nat. Hist. (6) iv. p. 169 (1889). 



