214 Mr. O. Thomas on some 



well-marked ridges and slight postorbital projections. Palatal 

 foramina narrow, parallel. Mesopterygoid fossa fairly wide. 



Dimensions of the type (measured on the spirit-specimen) : — 



Head and body 265 mm. ; tail 272 ; hind foot 61 ; ear 25. 



Skull : greatest length 66'6 ; condylo-incisive length 62 ; 

 zygomatic breadth 32*2; nasals 24*2 x 8*2; interorbital 

 breadth 10 ; mastoid breadth 21 ; palatilar length 335 ; 

 palatal foramina 7*3x3 - 3; width of mesopterygoid fossa 5; 

 upper molar series 12*2. 



Bab. Haveri, 9° 25' S., 147° 35' E. British New Guinea. 

 Alt. 700 m. 



Type. Adult male in spirit. B.M. no. 97. 8. 7. 67. Col- 

 lected by Dr. L. Loria, and presented by the Museo Civico, 

 Genoa. 



This species is distinguished by its long foot and long 

 slender skull ? with convex frontal region and long molar 

 series. 



Of the smaller forms of Uromys there seem to be a con- 

 siderable number of species, all closely allied and distin- 

 guishable merely by size and slight differences in colour. 

 The following appear to be undescribed : — 



Uromys arcium, sp. n. 



Size comparatively large, the skull larger than in any of 

 the other small species. General colour above dull rufous 

 brown (specimen skinned from spirit) ; below whiter through- 

 out, not very sharply defined laterally, the hairs white to 

 their roots. Hands and feet whitish, the metapodials 

 browner. Tail unusually short, shorter than the head and 

 body, practically naked, the few scattered hairs less than a 

 scale in length ; with about fourteen rings of scales to the 

 centimetre * ; blackish above, inconspicuously lighter below. 



Skull strongly built, heavier than in the few species of the 

 U. levipes-moncktoni group which equal it in length. Inter- 

 orbital edges with fairly well-marked beads, which are less 

 divergent posteriorly than in U. levipes and its allies. 



Dimensions of the type (measured on the spirit-specimen) : — 



Head and body 138 mm. ; tail 127 ; hind foot 28 ; ear 18. 



Skull : greatest length 40 ; condylo-incisive length 38*1 ; 

 zygomatic breadth 21 ; nasals 13*6 ; interorbital breadth 6'8; 

 mastoid breadth 14*7; palatilar length 18*1; palatal fora- 

 mina 6*2 ; upper molar series 7*1. 



* Caudal scale-rings are always counted about the middle of the tail ; 

 they become more numerous towards the tip. 



