NEW PERUVIAN MAMMALS 
BY WILFRED H. OSGOOD. 
The mammals described below are those obviously new from a 
collection made during the past year in northern Peru by Mr. M. P. 
Anderson and myself. Doubtless there are further novelties, but since 
it is the first considerable collection of middle Andean mammals brought 
to the United States, this is not readily ascertained. A complete report 
on the entire collection is in preparation but its publication is neces- 
sarily delayed. Knowledge of South American mammals as yet 
is so imperfect that no general monographic work has been done and in 
many groups there is much confusion. Year by year, however, the 
task of settling individual problems becomes simpler and it is to be 
hoped that the day is not very remote when some of the important 
general questions of distribution and relationship may be studied with 
accurate and sufficient data. 
Peramys peruvianus sp. nov. 
Type from Moyobamba. Peru. No. 19362 Field Museum’of Natural 
History. Male adult. Collected July 21, 1912, by W. H. Osgood and 
M. P. Anderson. 
Characters. Size small; coloration dark and rich; hair short and 
close, 4-5 mm. long on back; head, shoulders, and back Vandyke brown, 
darkening to blackish seal brown on rump; sides of belly and entire 
inguinal region drabbish or broccoli brown; median throat, chest, and 
anterior part of abdomen light buff to bases of hairs; chin brownish 
drab; arms, legs, and feet slightly darker than body. 
Skull small, light, and devoid of angularity; interorbital region 
smoothly rounded with only a slight postorbital protuberance; nasals 
moderately expanded posteriorly, ending far back of premaxillz; last 
upper molar greatly compressed. 
Measurements. Type: Total length 173; head and body 118; 
tail vertebre 55; hind foot 16. Skull of type (lacking posterior half of 
braincase): Zygomatic breadth 15.3; nasals 14.5 x 3.8; interorbital 
constriction 5.7; palate 15.2; front of canine to back of M‘ 12.4. Skull 
93 
