622 Mr. O. Thomas on 



brown tone usually found in ansfralis. Ears sliorf, as in 

 austrah'f, not as \\\ auritus. 



Skull longer \\\^xi\\\ austroUs^ tlie interoil)ital region longer 

 and narrowei-, and more sliaiply square-edited. Palatal 

 foramina proportionally shorter, not or scarcely penetrating 

 between the molars, wiiile in anstralis they reach to the level 

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

 is some variation in this respect. 



Dimensions of the type (measured on skin) : — 



Head and body (no doubt stretched) 165 mm. ; tail 130 ; 

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



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

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

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

 foramina I'D ; ujjper molar series 6' 7. 



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

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



Ti/pe. Young adult. B.M. no. 47. 1. 20. 2. Purchased 

 of Pamplin. 



The rats variously termed Pseudomys, Mits, or Hapalotis 

 australis, iiuirinus, and Imeolulns 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 range, that individual having been 

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

 Museum, is quite like the Liverpool S))ecimen 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. 



LXLIL — New Hesperomys and Galea //'ow 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 



