Bornean Species of the Genus Mus. 453 



ferred to M. Jerdoni, even among series from single localities, 

 is so great that it would at first sight appear impossible that 

 they should all belong to one species ; but the intergradation 

 seems to be so complete that I have for the present no alter- 

 native but to include them all under one name. Larger series 

 will, however, be necessary before a thoroughly sound con- 

 clusion can be arrived at.] 



10. Mus Margarettce, Thos. 



Size very small; hind foot about 19 millim. (16 in subsp. 

 pusillus). Tail very long, nearly twice the length of the 

 head and body, naked, unicolor brown. Fur soft, spineless. 

 Colour rich rufous, brighter on sides ; belly pure white. 

 Hands and feet whitish, but with brown metapodial patches; 

 claws very small ; thumb and great toe opposable. Mammae 

 1—2 = 6. 



Penrisen Hills [Everett). Subspecies pusillus, Mount 

 Kina Balu {Everett). 



11. Mus ephipjJi'um, Jent. 



Size as in M. Whiteheads. Tail rather longer than head 

 and body, unicolor brown. Fur coarse, rather spiny. Colour 

 dull grey, varying to rufous, especially in very old specimens. 

 Spines white, tipped with dark brown. Belly dirty greyish 

 white, the bases of the hairs grey. Hands and feet white. 

 Mammae 2 — 2 = 8. Bullae large, palatal foramina long. 

 Teeth normal. 



Sumatra (Leyden Museum) ; Kina Balu (Whitehead, 

 Everett) ; Labuan (Everett) ; Kayan Country, Upper Baram 

 River (Hose) ; Penrisen Hills (Everett) ; Palawan (Everett). 



[Lastly, there remains to be considered the group to which 

 the European house-rats belong, a group which has been the 

 bane of workers on Oriental Muridae, and which at present, 

 owing to want of material, it is quite impossible to bring into 

 any sort of order. Fortunately, so far as the present paper 

 is concerned, there is a Bornean name available, and this I 

 propose to use for the lowland rats of the group, without 

 expressing any opinion as to their relationship with extra- 

 Bornean species.] 



12. Mus neylectus, Jent. 



Size of Mus rattus • hind foot about 35-38 millim. Tail 

 ranging from a little shorter to a little longer than the head 

 and body, unicolor dark brown, fairly well haired, but not 



