540 MR. OLDFIELD THOMAS ON [May 1 5, 



10. Macropus rupus Desm. 

 5 (young). Alexandria. 



11. Trichosurus vulpecula aenhemensis Coll. 

 $. 123, 133. Alexandria. 



12. Dasyurus hallucatus Gould. 



2 . 138. Alexandria, 800'. 



" Trapped near water. Lives in lakes under and in rocks." — 

 W.S. 



13. Phascogalb mimulus, sp. n. 



2 . Skinned from spirit. Alexandria. (B.M. N'o. 6.3.9.75.) 



A small species with a red patch behind each ear. No lower 

 secator *. 



Size small, the general bulk far less than in Ph. macdonnellensis, 

 with which alone comparison is needed. Fur short and fine ; 

 hairs of back only about 5 mm. in length, as compared with 

 8 mm. in the allied species. General colour above rather browner 

 than " smoke-grey," rather greyer than " broccoli-brown," but 

 some slight alteration may have occurred during the few months 

 the specimen has been in spirit. Under surface dull cream-bufF, 

 probably whiter originally, the hairs dark slaty for three-fourths 

 their length. Head clearer grey than back, a light line edging 

 the eyes above and below. Ears of medium length, their fine 

 hairs rufous brown. Behind each ear a large and prominent 

 patch of light rufous hairs, contrasting strongly with the genei'al 

 colour. Upper surface of hands and feet dull whitish ; soles with 

 the main pads arranged as in Ph. macdon^iellensis, but the general 

 surface less granulated and the foot itself markedly narrower, 

 measuring in the type only 3*4 mm. in breadth as compared with 

 5*2. Tail nearly the length of the head and body, slightly 

 incrassated at base, thinly haired, not tufted or crested, dull 

 rufous brown above, rather paler below. 



Skull considerably smaller than that of Ph. maGdonnellensis, 

 but of the same general proportions. Nasals rather shorter and 

 broader. Bullae conspicuously smaller. 



Teeth as in the allied species, with the remarkable exception 

 that the last premolariform tooth, the " secator " (p* of the 

 Catalogue of Marsupials), while similarly absent in the lower jaw, 

 is in the upper well developed, two-rooted, barely smaller than 

 the tooth in front of it, and slightly larger than p'. In Ph. mac- 

 donnellensis this tooth is minute and single-rooted above in the 

 usual correlation to its total absence below. 



* The secator is the changing premolar, "p*" of the Catalogue of Marsupials, but 

 probably more correctly homologised with the tritus, or p-* of other mammals : 

 cf. Ann. & Mag. N. H. (7) xvi. p. 425 (footnote) (1905). In that footnote the 

 words " or more probably mp^ " should be deleted. 



