1906.] MAMMALS FROM WESTERN AUSTRALIA. 765 



10. ISTyctixomus planiceps Peters. 

 Xyctinomus ivilcoxi Kreflft ; N'. 2)etersl Leclie. 

 12 from Dwaladine and Dale River. 



"The specimens obtained were always flying over water." — 

 G. C. >S'. 



This Bat is an addition to the West Australian list, all previous 

 examj)les having come fi-om the south and east. 



It diflers by "its flattened head from N. norfolcensis Gray, to 

 which Dobson assigned it. He stated at the same time that 

 Gray's species had six lower incisors, but this is not the case in 

 any of these small Australasian Nyctinomi, as I have proved by 

 the examination of a considerable number of specimens, including 

 Gray's type of norfolcensis, a typical example of wilcoxi, and a 

 co-type of 2'>stersi. 



11. Oanis dingo Blum. 



'.'Apparently occurring throughout the South-west, but very 

 much thinned out in the fai-ming districts on account of their 

 being very destructive to stock. 



" Native names, ' Yarging,' ' Dwert.' " — G. C. S. 



12. Hydromys fuliginosus Gould. 



3 from Dale River. 



" Very plentiful throughout the South-west, near rivers and 

 swamps, not extending very far inland. It seems to feed to a 

 large extent on freshwater crayfish and shell-fish, the former 

 when used as a bait being very successful. 



" Native name, ' Wamp wamp.' " — G. C. S. 



The increase in the length of the hind feet with age is well 

 exemplified by these Dale River specimens, No. 194 having the 

 feet only 59 mm., while in No. 198, an old male, they are no 

 less than 72 mm. in length. 



13. MUS RATTUS L. 



" Plentiful around Albany, where it seems to be the common 

 house-rat. I did not obtain any specimens of Mus noroegicus in 

 the district." — G. C. S. 



14. Mus FUSCiPES Waterh. 



" A water-rat, frequenting the banks of rivers and reedy 

 swamps ; plentiful around Albany." — G. C. S. 



15. Mus shortridgei, sp. n. 



S. 542. Woyaline, east of Pinjelly, 970', 27 April, 1906. 

 B.M. No. 6.8.1.73. Type. 



" Trapped near water." — G. G. S. 



Size rather smaller than in Mtbs lineolatus, about three-fourths 

 that of Mus ratt'us. Fur long, soft and loose ; ordinary hairs of 

 back about 17, longer hairs about 22 mm. in length General 



