On Mammals from N.E. New Guinea. 669 
LX XXII.—On Mammals collected by C,. Keysser in the 
Saruwaged and Rawlinson Mountains Region of N.E. 
New Guinea. By OLDFIELD THOMAS. 
(Published by permission of the Trustees of the British Museum.) 
By the kindness of Lord Rothschild I have had the opportunity 
of working out a number of mammals which were collected 
some years ago in the projecting eastern part of what was then 
German New Guinea by the Dutch Missionary, C. Keysser. 
The British Museum had never received any mammals at all 
from this region, while the few that have been recorded are 
themselves mostly from Mr, Keysser’s collections, determined, 
and in some cases described, by Prof. F. Forster, sometimes in 
conjunction with Lord Rothschild. 
The present collection is mostly from the great mountain 
mass known as the Saruwaged Mountains, of which the better- 
known Rawlinson Mountains are said to be mere outliers. 
But from the mammal point of view, the Saruwaged and 
Rawlinson Mountains are almost equally unworked, so that 
the present collection is of very great interest, and adds 
materially to our present imperfect knowlege of New Guinea 
mammals. 
1. Mallomys hercules, Thos. 
3, R.M.9. Saruwaged Mts. 
Only the second known specimen of this fine rodent, the 
first, the type, having been given to the Museum by Lord 
Rothschild in 1912. 
2. Anisomys tmitator, Thos. 
3, R.22 (imm.). No exact locality. 
3. Stenomys rufulus, sp. n. 
R.M. 18,19. Saruwaged Mts., 4000 m., August 1914. 
A small species of a reddish colour. 
Size and essential characters as in S. niobe, but colour 
strongly rufous. Upper surface uniform strong cinnamon- 
brown, sides scarcely paler, under surface sayal-brown, the 
hairs slaty for about two-thirds their length. Head and ears 
quite like body. Hands and feet darker brown, Tail 
apparently shorter than in niobe, but doubtfully perfect in 
the type. 
Skull apparently as in niobe, the supraorbital edges smoothly 
