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_ APRIL, 1914. MAmMALs oF NoRTHERN Perv — Oscoop 147 
theless, a rough hilly country separates Moyobamba from Balsapuerto. 
The climate is warm but not typically tropical and the nights are always 
delightfully cool. Work here was done chiefly about the flats along 
the river and in some rather heavy moist forest near the thermal springs 
a few miles west of the town. Altitude 2,800 ft. = 
Balsapuerto, Aug. 19. The hills and mountains are definitely left 
behind at Balsapuerto. Within a few miles to the westward is moun- 
tainous country and distant outlying hills may be seen elsewhere, but 
in general the region is a flat forested plain. Altitude 700 ft. 
Yurimaguas, Aug. 25—Oct. 5. Yurimaguas, situated on the Huallaga 
River at the mouth of the Paranapura, is well within the Amazonian 
plain wholly surrounded by unbroken forest. Mr. Anderson collected 
at three localities within a few miles of the town: Munichis, a small 
Indian village several miles west; Yane Yaku, a chacra or farm on the 
Paranapura River about 8 miles from Yurimaguas; and Puerto Arturo, 
a small place a few miles below Yurimaguas on the Huallaga River. 
Altitude 600 ft. 
Lagunas, Oct. 10-20. A small village on the east bank of the 
Huallaga River not far above the junction of the Marafion and the 
Huallaga. It is in the heavily forested rubber district. Collections 
from this locality were made only by Mr. Anderson. Altitude soo ft. 
Nazareth, Sept. ro. <A village at the edge of a rubber forest on the 
Yavari River some 20 miles above its mouth and opposite the Brazilian 
village of Remate de Males. 
Peramys peruvianus Osgood. Peruvian PeRAmys. 
Two specimens, Moyobamba. 
These were caught in mouse traps in relatively open forest where 
the undergrowth was limited. Unfortunately, both were attacked and 
badly mutilated by ants while in the traps. The skin of the type, 
_ however, lacks only part of the tail, ears, and feet and therefore suffi- 
ciently shows the coloration. The other specimen was preserved in 
alcohol. This is one of the smaller species of Peramys and appears 
very distinct from any previously described. 
Didelphis marsupialis Linneus. LINN2&AN Opossum. 
Two specimens: Moyobamba (1), Yurimaguas (1). 
One of these is in the light and the other in the dark phase and both 
agree in color with corresponding specimens from northeastern Brazil 
representing typical D. marsupialis. The skull of the larger specimen, 
