608 Mr. 0. Thomas on 



feet silvery white. Tail well haired, brown above, white 

 below. 



Skull as usual in the restricted subgenus Pseudomys^ 

 larger than in any other species. The teeth fairly broad. 



Dimensions : — 



Head and body (s luffed) 130 mm. ; tail (of another 

 specimen) 125; hind foot 32 ; ear (dry) 26. 



Skull : molar series of type 6*4. 



Another skull from same locality : greatest length 35*5 ; 

 basilar length 30; greatest breadth 2&5 ; nasals 14*8; 

 interorbital breadth 4'5 ; breadth of brain-case 15*2 ; palatilar 

 length 18; palatal foramina 9*2; upper molar series 6'3. 



Hah. South Australia. Type from Lake Albeit. 



Type. Adult. B.M. no. 53. 10. 22. 6. Collected by 

 F. Strange ; purchased of Mr. Gould. Two specimens and 

 a separate skull. Also two from " S. Australia," presented 

 by Sir George Grey, and one presented by Lord Derby. 



The original Hapalotis murinus, Gould, was described 

 from New South Wales on a specimen now in the Museum 

 (no. 53. 10. 22. 4). This specimen is allied to, if not 

 identical with, the far earlier Pseudomys oustralis, Gray, 

 and Gould was clearly in error in assigning to the same 

 species the series collected by Mr. Strange at Lake Albert, 

 S. Australia. The former has the ears of about the normal 

 size, while in the latter they are conspicuously larger than 

 usual, and afford a ready means of identifying the present 

 species. No doubt Gould's beautiful plate, which is as 

 nearly perfect as an}' illustration can be, was drawn mainly 

 from his fresh series from Lake Albert. 



Pseudomys {Thetomys) prceconis, sp. n. 



A medium-sized blue-grey species with long tail. 



Fur rather loose and shaggy, not so soft and fine as 

 in Ps. albocinereus, to which this species has a superficial 

 resemblance. Hairs of back about 14 mm. in length, the 

 longer bristles and hairs reaching 18. General colour above 

 " drab-grey,''' the median dorsal area browner, the sides 

 clearer grey. Flanks slightly huffy. Under surface soiled 

 greyish, the bases of the hairs slaty, the ends dull creamy. 

 Ears long, dark brown. Hands and feet dull whitish. Tail 

 long, well haired, slightly tufted terminally, brown above, 

 blackening towards the tip, whitish on sides and below. 



Skull about as large as that of Ps. gouldi or glaucus, but 

 differing from the latter by the undercut anterior zygoma- 

 root and the anterior supplementary cusp of m 1 characteristic 



