608 Mr. O. Thomas on 



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

 below. 



ISkull as usual in the restricted subgenus FseudomySf 

 lar<rer than in any other species. The teeth tairly broad. 



Dimensions : — 



Head and body (sluffed) 130 mm. ; tail (o£ another 

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



Skull : molar series of type 6*4. 



Another skull from same locality : greatest length 3o*o ; 

 basilar length 30; greatest breadth 2'S'5 ; nasals li'S; 

 interorbital breadth 4"5 ; breadth of brain-case 15'2 ; })alatilar 

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



Hah. South Australia. Type from Lake Albert. 



Type. Adult. B.M. no. 53. 10. 22. G. 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 IJa}>aIotis vnirinus^ Gould, was described 

 from New South Wales on a specimen now in the Museum 

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

 identical with, the far earlier Pseudomys (nisfralis, 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 sott and fine as 

 in Ps. alboci'nerei(S, 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 buffy. Under surface soiled 

 greyish, the bases of the hairs slat}', the ends dull creamy. 

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

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

 blackening towaids the tip, \\ hitish on sides and below. 



Skull aLout as large as that of Ps. gouldi or ylaucus, but 

 difl'ering from the latter by the undercut anterior zygoma- 

 root and the anterior supplementary cusp of m' characteristic 



