546 Mr. O. Thomas on new 
confirms Dobson’s views on the subject and also those I have 
expressed in connexion with Vampyrops*. 
Saccopteryx infusca, sp. n. 
Similar in all essential respects to S. (Palantiopteryx) 
plicata, Pet., but rather smaller and less thickly built, much 
darker in colour, with decidedly narrower ears, less hairy 
inteifemoral, and no white line along the posterior edge of 
the wing-membrane. 
Kars narrow, inner margin faintly concave in its upper 
half; tip narrowly rounded off; outer margin straight above, 
shghtly convex below. Interfemoral very thinly hairy as 
far as the exsertion of the tail. 
Colour (from a skin) dark chestnut-brown above, scarcely 
paler below. SS. plicata is slaty grey. 
Dimensions of the type (an adult male in spirit) :-— 
Forearm 41 millim, 
Head and body 42; tail 15; tail free from membrane 2°7 ; 
ear 11°3; tragus on inner edge 3:3; lower leg 16; calcar 14. 
flab. Cachavi, N. Heuador. Coll. W. F. H. Rosenberg, 
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, 
such as N. grandis, but the head, judged by the skull, seems 
to 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 decumanus. 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. Tail 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). 
