_NEW-GUINEA MAMMALS. 237 
with dirty white tips; upperparts of head of a sooty black; 
hairs generally much shorter than in Lorentzii, although 
not at all adpressed like in Nouhuysii. Tail with adpressed 
rather short brownish hairs, its basal part however adorned 
with a sharply defined ring of much longer hairs for about 
ten millimeters. Hairs of hands and feet of a sooty color, 
extending over the small curved claws. The anterior pair 
of upper incisors is separated from the other incisors 
by a very conspicuous interval; they are rather sloping; 
the second and third upper premolars are of the same size 
and shape, meanwhile in Lorentzii and Nouhuysii the third 
upper premolar is a good deal smaller than the second 
one; in the lower jaw likewise the second and third premolars 
are of the same size and shape, meanwhile in Lorentzi 
and Nouhuysii the third lower premolar is very small, the 
second being more than twice longer and broader. Nasalia 
broadly crested and slightly curved, so that a kind of small 
ram’s nose is imitated, giving to the head of the animal a 
peculiar aspect, quite different from that of the other Phasco- 
gale-species; therefore I propose the specific title »naso’. 
Anisomys imitator O. Thomas. 
This large rat has very peculiar lower incisors; they 
are so different from the incisors of all other rats, that 
this character alone is sufficient to recognize the species 
among thousends others; these lower incisors combined are 
of only the same breadth in front as a single upper one, 
while in depth the lower teeth exceed the upper ones 
by a third. The type-specimens are a male and a female, 
collected by Meek in British New-Guinea, Avera, Aroa- 
river; other specimens have never been found. Now it is 
very interesting that I detected among a rather large lot 
of lower jaws belonging to different Mice and Marsupials 
procured January 23, 1910, by the Lorentz-expedition from 
the indigenous Pesegem-tribe (1500 M.), on the Oroh, a 
branch of the Lorentz-river, a right and a left jaw, together 
INotes from the Leyden Museum, Vol. X XXIII. 
