lints and Rodents from Americi. .'!>45 



Artihtus (Dermanura?) Roscnbergi^ 3[). n. 



Size sniall. Anierior end of nose-leaf free, its sides without 

 extra lobes, its upright portion unusually broad, nearly or 

 quite as broad as the horsL'shoe. Ears of niediuui leii'^tli, 

 their inner margin evenly convex, tip roundeil, outer margin 

 with two sliglit 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 tlie metatarsus. 

 Interfenioral einaririnate to the level uf the distal third of the 

 tibia?. Distribution of fur much as in A. f/Iaucus, but tiie 

 hairs on the base of tlie poUex 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. 



iSkull of somewhat the same general shape as that of 

 A. quadrivittafus, but decidedly narrower throughout. 



Upper inner incisors small, their cusps subequal ; outer 

 incisors about half the height of the inner ones. .Molars less 

 broad than usual, the posterior one (w.*) scarcely more than 

 one third the area in cross section of the tir.st, 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 W3 

 present on the left side only, so excessively minute that I 

 am induced to consider the other side as the normal one. 



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



Forearm 37 millim. 



Head and body 54 ; ear from notch l-4*5 ; tragus 4*7 ; 

 nose-leaf, length 11, breadth of horizontal part 5'9, of upright 

 part 0"8; length of lower leg 14; calcar 5; depth of inter- 

 femoral in centre 9. 



Skull: basal length 16"5 ; greatest length 21; zygomatic 

 breadth 11"1 ; intertemporal breadth 5 2 ; palate, length 9'7, 

 breadth outside m.^ 8'3, inside ni} 4"2 ; tip to tip of upper 

 canines 4"5 ; front of canine to back of tn.^ &Q ; ditto in lower 

 jaw 7 ; horizontal length of m^ 2, of W2 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 



