200 Fretp Museum or Naturat History — Zoétoey, Vor. X. 
the Amazon near Santarem for a time, the whole party returned directly 
to the United States. 
Notwithstanding the difficult climatic conditions and the limited 
time which was available for actual field work the collections obtained 
are of considerable size and importance, especially in view of the very 
small representation of the fauna of the region traversed which was 
previously possessed by North American museums. According to the 
generous plan of Mr. Collins and Mr. Day these collections are to be 
divided equally by the American Museum of Natural History and the 
Field Museum of Natural History, the types of new birds remaining 
with the New York institution and those of new mammals with the 
Field Museum. ve 
The collection of mammals numbers some 325 specimens belonging 
to 41 species and subspecies, of which four are new. In the brief 
account of this collection which follows, I am indebted to Mr. Collins 
for the notes on the hunting of guanacos and vicugnas. 
Marmosa elegans venusta Thomas. MousrE Opossum. 
Four specimens, Parotani. 
These topotypes are welcome additions to the collection of the Field 
Museum, as of course they would be to any other. An interesting 
character shown by two of them which are mature is a rather definite 
dark spot occupying a considerable space on the side just behind the 
shoulder. This is colored like the dark dorsal area and forms an inter- 
ruption in the lower half of the lighter lateral area which in its upper 
half separates this dark spot from the dorsal area. 
Bradypus tridactylus Linnaeus. THREE-TOED SLOTH. 
Three specimens, Santarem, Brazil. Collected by G. K. Cherrie. 
Hippocamelus antisiensis D’Orbigny. PERUVIAN GUEMAL. 
One specimen, Pampa de Arrieros, Peru. 
This is an immature male with milk dentition and short, stubby 
horns. The pelage is somewhat worn but in general the hairs of the body 
have buffy tips producing a rather pallid effect which is sharply con- 
trasted with a dark blackish brown area on the back and rump just 
anterior to the base of the tail. The tail itself is entirely white both 
above and below and the white areas on the inner sides of the legs 
extend to the hoofs, The dark facial markings, so well developed in 
the Chilian H. bisulcus, are reduced to brownish patches over the eyes. 
This species was found up to an altitude of 13,000 feet, in general 
ranging somewhat lower than the guanaco and vicugna. 
