386 Mr. 0. Thomas 071 



Uromys naso^ sp. n. 



Near U. lorentzii, but skull longer and more compressed. 



Size slightly larger than in tJ. lorentzii, the hind foot 

 decidedly longer. Fur ciisp and velvety; hairs of back 

 between 8 and 9 mm. in length. General colour above as 

 usual brown, becoming more rufous on rump. Under surface 

 greyish white, the hairs slaty basally, dull greyish white 

 terminally; line of demarcation on sides rather well defined. 

 Head grey. Hands and feet dull whitish. Tail black, its 

 under surface inconspicuously marked with dull whitish — 

 equally different from the sharply bicolor tail of lorentzii and 

 the wholly black one of the next species. 



Skull longer and narrower than that of U. lorentzii, the 

 greatest si)read of the zygomata at their anterior end, instead 

 of posteriorly. Muzzle high, narrow and compressed late- 

 rally, the nasals long and narrow. Maxillary part of zygo- 

 mata broadened vertically, so that the vertical diameter, 

 opposite the back of m', is nearly 3 mm., the broadest in a 

 series of lorentzii being under 2 mm. Palatal foramina 

 rather longer than in lorentzii. Molars comparatively narrow. 



Dimensions of the type (measured in flesh) : — 



Head and body 188 mm.; tail 132; hind foot (s. u.) 36; 

 ear 21. 



Skull : gieafest length 45'0 ; condylo-incisive length t 

 41*3; zygomatic breadth 20*2; nasals 17x5; interorbital 

 breadth 7 ; breadth of brain-case 16"5 ; height of crown from 

 alveolus of m^ 11*6 ; palatilar length 21 ; diastema 12*7 ; 

 palatal foramina 7 X 3'2 ; upper molar series 8"6. 



Hah. Kafari River, S.W. New Guinea. Type from 

 " Whitewater Camp." Alt. 400'. 



Type. Adult female. Original number 2512. Collected 

 19th October, 1910, by C. H. B.Grant on the B.O.U. Expe- 

 dition to New Guinea. Presented by the Subscribers. 



Compared with a series of skulls of what I refer to 

 Uromys lorentzii, Jent., that of the present animal is at once 

 distinguishable by its more elongate shape^ compressed 

 muzzle, and by the peculiar broadening of the maxillary part 

 of the zygomatic arch. Externally tiie animals are closely 

 similar, though U. naso has not the conspicuously bicolor tail 

 of U. lorentzii, and its foot is longer. 



"t From the back of the condyle to the most anterior point on the 

 convex front surface of the incisors. This measurement, which I have 

 already used in the case of shrews, I believe to be a better one for rodents 

 than any other that has been proposed. 



