South- American Murida. 495 



dwarf representative of 0. laticeps^ I have named in honour 

 of Dr. Goeldi, to whose exertions, both as collector and 

 author, we owe much of our knowledge of the fauna of 

 Brazil, and to whose generosity the British Museum has been 

 frequently indebted. 



Hohchilus na7ius, sp. n. 



General characters and colour very much as in the large 

 H. vulpinus and sciureus^ but scarcely half the bulk of the 

 latter, the smallest previously known species of the genus. 

 Colour coarsely mixed black and rufous, darkest on the 

 middle line, clearer rufous on the sides, becoming quite bright 

 rufous along the edges of the belly. Belly whitish, strongly 

 washed with rufous, but the under-fur slaty grey basally. Face 

 blackish brown, rather darker than the back ; cheeks mixed 

 with rufous. Ears rather short, hairy, their inner surfaces 

 mixed rufous and brown, their outer brown anteriorly, rufous 

 posteriorly. Arms rufous, metacarpals brown, fingers whitish 

 brown. Hind feet whitish brown ; soles naked, strongly 

 fringed with the bristles of the edge of the feet. Tail rather 

 shorter than the head and body, uniformly well haired, dark 

 brown above, scarcely or not lighter below. 



Skull with the essential characters of that oiH. sciureus'^ ^hxxi 

 much smaller, and with the interorbital region flatter and less 

 compressed. Anterior edge of zygoma-root slightly concave, 

 less so than in H. vulpinus. Supraorbital ridges less promi- 

 nently marked than usual and not standing up vertically 

 above the general level, very inconspicuous on the anterior, 

 and not extending at all on to the posterior half of the 

 parietals ; the interorbital region anteriorly is as usual narrow 

 and compressed, but posteriorly it broadens more than is 

 usual in this group. Anterior palatine foramina narrow, 

 ending just in front of m^. Molars as usual. 



Dimensions of the type (measured as a spirit-specimen, 

 before skinning) : — 



Head and body 122 millim. ; tail 112; hind foot 32; 

 ear 14. 



Skull: basilar length 26*6; greatest breadth 19; nasals 

 12-5x3*8; interorbital breadth 4-6; interparietal 2*6x11; 

 palate length from henselion 16*7 ; diastema 9*7 ; palatal 

 foramina 6*7 X 2"3 ; length of upper molar series 6*5. 



It is interesting to notice that while the external and cranial 

 dimensions are much less than in //. sciureus, the length of 

 the molar tooth series in the two species is almost identical. 



• Figured by Winge under the name of Siymodon vulpinus, E Mas. 

 Lundii, i. pt. iii. pi. ii. fig. 5 (1888). 



