540 On the AuslraUan Jerhoa-rats. 



The following appears to be (or, more probably, to have 

 been) a definable subspecies of A . miiclielli : — 



5 a. Notomys mitcheVi macropns, subsp. n. 



Essential characters of true mitcJielli, but the ?eet longer 

 and the fur longer and thicker; hairs of back about 8—9 nun. 

 General colour more bluej'-grey, not so brown as in mitcheUi ; 

 ihe type, however, considerably taded. Under surface uhitisli 

 with slatv b:ises. Feet more thickly haired than in mitchelU, 

 widte. Tail well-haired, pencilled, prominently bicolor. 



Skull of type, so far as remains, as in mitchelli. 



Dimensions of the type (measured on skin) : — 



Head and bod}' 120 mm.; tail 153; hind foot 37; ear 

 (wet) 26. 



Skull: nasals 11'3 ; iiiterorbital breadth O'l ; palatilar 

 lenuth 14 ; palatal foramina 6'2 ; upper molar series 5*1. 



llah. South Australia — believed to be Kangaroo Island. 



Tiipe. Adult. B.M. no. 55. 12. 34. 361. Collected bv 

 Dr. J. B. H;<rvey, who then lived in Kangaroo Island, and 

 presented by him in 1841 to the Zoological Society's Museum. 

 One specimen only. 



6. Notomys aquUo^ sp. n. 



A small pale species with thin fur. 



Size slightly less than in mitchelli. Fur thin, poor, not 

 woolly. General colour pale sandy brown above, white 

 below, the hairs white to their bases. A well-marked neck- 

 gland present in the type. Feet thinly haired, flesh-coloured. 

 Tail sandy brown, not conspicuously bicolor proximally. 



Skull delicately built. Interorbital region flat, more 

 parallel-sided than itsiial, less quickly broadening posteriorly. 

 Lacrymal bones unusually large in the type, though this may 

 be mainly due to age. Palatal foramina fairly large, well 

 open. Anterior end of mesopterygoid fossa narrow, parallel- 

 sided. Molars small. Incisors more or less orthodont, index 

 of type 70°. 



Dimensions of the type (measured on skin) : — 



Head and body 108 mm.; tail (imperfect); hind toot 

 (wet) 35 ; ear (wet) 16. 



Skull : back of pariotals to front of nasals 26'3 ; nasals 11*2 ; 

 inttrorbital breadth 6'2 ; palatilar length 13'2 ; ]ialiital 

 foramina 5'8 ; breadth of mesopterygoid fossa anteriorly I'G ; 

 upper molar series 5. 



Hub. Cape York, N. Queensland. 



Type. Old male with worn teeth. B.M. no. 67. 9. 17. 2. 

 Purchased of the dealer Higgins; collected by J. T. CockerelL 



