136 Mr. O. Thomas on 



similarly directed forwards. Head dark rufous-brown, infer- 

 raniia and throat dull drabby or rufous ; a tetidency for an 

 ill-defined lateral line on the neck to be of tliis latter colour. 

 Tail broaflly grizzled with black and dull buffy. 



Skull strongly built, usually with peculiarly shortened 

 muzzle and widely expanded zyoomata. Teeth stout and 

 heavy, often very mucli so, the tliickening of the inner lobe 

 of m^ at a maximum. 



Dimensions of the tj'-pe : — 



Hind foot (dry) 81 mm. Skull : condylo-basal length 88; 

 zygomatic breadth 55; maxillary tooth-row 33; breadth 

 l)etween outer corners of carnassials 30 ; length of carnassial 

 on outer edge 8*3. 



IJah. Mountainous region of Eastern Sarawak, notably the 

 Earam district. Type from Mt. Dulit. 



7]/pe. Old male. B.M. no. 99. 12. 9. 26. Collected 17(h 

 December, 1896, and presented by Dr. Charles Hose. Four 

 sjiecimens examined. 



The Bornean material in the ]\Iuseum seems to indicate 

 clearly that two races of //. brachyurus occur there, the one 

 olivaceous blackish without waimer suffusion, and the other 

 more or less rufous or ochraceous. And, so far as exactly 

 labelled specimens are concerned, the former is a lowland 

 and the latter a mountain race. But far more specimens 

 with exact localities are needed before the respective ranges 

 of the two forms can be made out. 



XI. — A new Genus of Opos-um from Southern Patagoina. 



By Oldfield Thomas. 



(PuLlislied by permission of the Trustees of the British Museum.) 

 Among some small mammals collected by Mr. T. H. Hall at 

 Cape Tres Puntas, on the east coast of Southern Patagonia, 

 in south latitude 47% there occurs, most unexpectedly, a 

 small opossum, this locality beii;g fav to the south of any 

 hitherto recorded tor the fatnily, the previously known 

 southern limit having been the Island of Chiloe, 42°-43° S. 

 The collection was sent by Mr. Hall to the Perth Museum, 

 Western Australia, whence it has been transferred by ex- 

 change to the British Museum. 



The opossum is a small animal, externally very like the 

 Chilian opossum, Marmosa elegans, but close examination 

 reveals so many differences from that as from other members 



( 



