670 Mr. O. Thomas on 
rounded. No tendency to the peculiar cranial inflation of 
S. arrogans. 
Dimensions of the type (measured on skin) :— 
Head and body 122 mm.; tail (doubtfully perfect) 106 ; 
hind foot (wet) 27; ear 16. 
Skull: greatest length 33°5; condylo-incisive length 30 ; 
nasals 12:6; interorbital breadth 5:8; breadth of brain-case 
14:2; zygomatic plate 2°4; palatilar length 14°8; palatal 
foramina 4°9 ; upper molar series 5°7. 
Hab. Saruwaged Mts., 4000 m. ‘From the highest 
oint.” 
: Type. Adult female. Original number 18. Collected 
August 1914 by C. Keysser. Presented by Lord Rothschild. 
T'wo specimens. 
The strong cinnamon colour of this mountain-rat is 
peculiar to it, all the other species being of a dark brown. 
The members of the genus Stenomys are characteristic of 
the New Guinea mountains, and are often the only Muride 
to be found at the higher altitudes. ‘The present one, from 
13,000 feet, occurs at a greater height than any as yet 
recorded. 
4, Pogonomys sylvestris, Thos. 
Two specimens. Rawlinson Mts., June 1911. 
Described on these examples in 1920. 
5. Macropus keysseri lanatus, subsp. n. 
3, R.M. 8 (Keysser No. 24), 10 (young). Saruwaged 
Mts., 3000-3800 m., August 1914. 
2, R.M. 6, 7, 14. Saruwaged Mts., 3000-3800 m., 
August 1914. 
Essential characters as in keysser of the Bulung region, 
but the fur much thicker, longer, and more woolly (hairs of 
hind back nearly 40 mm.), while the colour, instead of being 
nearly uniformly dark brown (face, nape, and back), is marked 
by there being a distinct nuchal mantle of lighter brown hairs 
separating the blackish crown from the dark brown back. 
General colour of back near “ cinnamon-brown,” the lighter 
tone, as compared with keysseri, being due to the greater 
development and prominence of the more or less cinnamon and 
very woolly underfur. Under surface much more strongly 
ochraceous than in keysser2, approaching “ochraceous-tawny.” 
Tail more heavily clothed than in keyssert, well-haired through- 
out ; bicolor, the upper side dark brown, the lower dull buffy 
whitish. 
