622 Mr. 0. Thomas on 



brown tone usually found in ausfralis. Ears short, as in 

 austrah's, not as in auritus. 



Skull longer {\\iiXim ousti-alis^ tlie interorbital region longer 

 and narrower, and more sharply square-edoeJ. Palatal 

 foramina proportionally shorter, not or scarcely penetrating 

 between the molars, while in anstralis tliey reach to the level 

 of the middle of m^. Teeth averaging larger, though there 

 is some variation in this respect. 



Dimensions of the type (measured on skin) : — 



Head and body (no doubt stretched) 165 mm. ; tail 139 ; 

 hind foot (wet) 32 ; ear (wet) 20. 



Skull: tip of nasals to back of inteiparietal 34 ; condylo- 

 incisive length 31'5 ; zygomatic breadth 17*7 ; nasals 14 ; 

 interorbital breadth 3'6 ; breadth of brain-case 16 ; palatal 

 foramiiui 7'5 ; upper molar series G"7. 



Hah. Coast region of New South Wales. A specimen in 

 Liverpool Museum from the Hastings River (Gould Coll.). 



Type. Young adult. B.M. no. 47. 1. 20. 2. Purchased 

 of Pamplin. 



The rats variously termed Pseudonu/s, Muft, or Hapalotis 

 oustralis, murinus, and lineolatus 1 believe to be all one 

 species, and they certainly all come from one region — namely, 

 that of the Darling Downs and Liverpool Plains, on the 

 western side of the great dividing range. The present form, 

 on the other hand, as shown by a specimen (no. 409) in the 

 Liverpool Museum, occurs, or, at least, used to occur, on the 

 coast to the east of the rang(% that individual having been 

 collected on the Hastings liiver. The type, in the British 

 Museum, is quite like the Liverpool specimen in the peculiar 

 lengthening of the middle part of the skull and the compara- 

 tively short palatal foramina, the two specimens apparently 

 representing a definable geographical race. 



LXILL — New Hesperomys and Galea /row Bolivia. 

 By Oldfield Thomas. 



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



The British Museum owes to the generosity of the Marquis 

 de Wavrin a further small collection of mammals obtained 

 during his S.-American expedition — this time from the 

 Parapiti region of Eastern Bolivia, south of Santa Cruz de 

 la Sierra. With the exception of the mammals obtained by 



