Bats and Rodents from America. 545 
Artibeus (Dermanura?) Rosenbergi, sp. n. 
Size small. Anterior end of nose-leaf free, its sides without 
extra lobes, its upright portion unusually broad, nearly or 
quite as broad as the horseshoe. Lars of medium length, 
their inner margin evenly convex, tip rounded, outer margin 
with two slight concavities separated by a convexity, an 
indistinctly marked convex lobe below. Tragus straight, 
sharply pointed, its outer side with four or five sharp pro- 
jecting points. Wings to the middle of the metatarsus. 
Interfemoral emarginate to the level of the distal third of the 
tibie, Distribution of fur much as in A. glaucus, but the 
hairs on the base of the pollex and the hinder limbs are 
much more sparse. 
Colour (in a spirit-specimen) apparently dull greyish above, 
slightly paler below. Four indistinct facial lines perceptible. 
Skull of somewhat the same general shape as that of 
A. quadrivitiatus, but decidedly narrower throughout. 
Upper inner incisors small, their cusps subequal ; outer 
incisors about half the height of the inner ones. Mbolars less 
broad than usual, the posterior one (m.*) scarcely more than 
one third the area in cross section of the first, which is itself 
only about one fifth broader than the posterior premolar. 
Lower incisors bicuspid, subequal, touching each other. 
Lower molars corresponding in size to those above, the second 
barely three fourths the length of the anterior one. An ms 
present on the left side only, so excessively minute that I 
am induced to consider the other side as the normal one. 
Dimensions of the type (an adult male in spirit) :— 
Forearm 37 millim. 
Head and body 54; ear from notch 14:5; tragus 4°7; 
nose-leaf, length 11, breadth of horizontal part 5°9, of upright 
part 5°8; length of lower leg 14; calear 5; depth of inter- 
femoral in centre 9. 
Skull: basal length 16°5; greatest length 215; zygomatic 
breadth 11:1; intertemporal breadth 5:2; palate, length 9:7, 
breadth outside m.’ 8:3, inside m.' 4°23 tip to tip of upper 
canines 4°5; front of canine to back of m.* 6°6; ditto in lower 
jaw 7; horizontal length of m, 2, of m, 1:5. 
Hab. Cachavi, N. Ecuador. Coll. W. F. H. Rosenberg, 
17th December, 1896. 
This little species may be readily distinguished from all 
others by its broad nose-leaf, narrow skull, and the unusual 
proportions of its molars. The presence of a third lower 
molar on one side and not on the other is interesting, as 
showing the entire unreliability of the presence or absence 
of such teeth as a character of generic rank, and strongly 
