540 On the Australian Jerhoa-rats. 



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

 been) a definable subspecies of A', mitckelli : — 



5 a. Notomys mitckelli macropus, subsp. n. 



Essential characters of true mitchelli, but the ?eet longer 

 and the fur longer and thicker; hairs of back about 8-9 mm. 

 General colour more bluey-grey, not so brown as in mitchelli ; 

 the type, liowever^ considerably tadcd. Under surface whitish 

 witli slaty bases. Feet more thickly haired than in mitchelli, 

 white. 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 body 120 mm.; tail 153; hind foot 37; ear 

 (wet) 26. 



Siaill: nasals 11*3; interorbital breadth o'l ; palatilar 

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



Hah. South Australia — believed to be Kangaroo Island. 



Type. Adult. B.M. no. 55. 12. 34. 361. Collected hv 

 Dr. J. B. Harvey, who then lived in Kangaroo Island, and 

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

 One specimen onl}'. 



6. Notomys aquilo, 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 usual, 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 foot 

 (wet) 35 ; ear (wet) 16. 



Skull : back of parietals to front of nasals 26-3 ; nasals 11-2 ; 

 interorbital breadth 5*2 ; palatilar length 13-2 ; palatal 

 foramina 5-8; breadth of mesopterygoid fossa anteriorly 1*6 ; 

 upper molar series 5. 



Hah. 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. 



