19S 
APPENDIX. 
their edges white, the contrast especially strongly marked on the feet, where a broad band of deep 
blackish brown passes along the centre, edged on each side with pure white. Sole-pads large, smooth, 
and prominent, the last one about three times as long as broad. Fifth hind toe, without claw, reaching 
to the end of the first phalanx of the fourth. Ears rounded, rather short, laid forward they barely reach to 
the posterior can thus of the eyes. Tail enormously long, evenly finely haired, the scales, which are 
large, averaging from seven to nine to the centimetre, uniformly dark brown above and below throughout, 
but the hairs black for the proximal two thirds above only, elsewhere pure white. Mammae 2-2 = 8. 
Dimensions of the type, an adult male, preserved as a skin :— 
Head and body 280 millim.; tail 340; hind foot 43*5; ear, above head 18; breadth 18 ; heel to front 
of last foot-pad 23; length of last foot-pad 7 , 0. 
Skull: tip of nasals to centre of fronto-parietal suture (“bregma”) 36 millim. ; nasals, length 21, 
greatest breadth 6'0 ; interorbital breadth 7*7 ; outer wall of infraorbital foramen, length 4*7; palate 
length 26'5 ; length of palatal foramen 7*9 ; diastema 13'6 ; length of upper molar series 9'4. 
Dimensions of a fine female in spirit, preserved in the Museo Civico, Genoa:—Head and body 230 ; 
tail 393 ; hind foot 49 ; ear 20; heel to front of last foot-pad 25 ; length of last foot-pad 8 - 8. 
This spirit-specimen was obtained by Signor Beccari at Sungei Bulu, W. Sumatra, thus affording 
another instance of the relationship between the mountain-faunas of Sumatra and Borneo. Its examina¬ 
tion, which I owe to the kindness of my friend the Marquis of Doria, has enabled me to add certain 
particulars, only observable in spirit-specimens, to the original description of this species. 
Mas sabanus belongs to a well-marked group of Rats which oontains Afits jercloni , Bly., M. niveiventer, 
Hodgs., M. coxingi, Swinh., M. edwardsi , Thos., AT. hellwaldi, Jent., AL alticola, Thos., and others. 
These specie's are, however, all very much smaller than it is, with one exception, AL edwardsi , which is as 
much larger, and not one of them has a tail of anything like the extraordinary length of that of 
Alas sabanus. 
One species, indeed, also a native of Borneo, has a certain superficial resemblance to the present one, 
although belonging-to quite a different group of Rats. This is M. muelleri, Jent., of about the same 
size, and with a nearly equally long tail; but it may be readily distinguished by its coarse Mus 
decumanus- like fur, yellowish instead of rufous coloration, the less sharply defined white underside, and 
by the quite uniformly brown-haired feet and tail. 
16. Mus lepturus, Jent. 
a. Ad. 
b. Imm. 3000 feet. 24/3/88. 
Described by Dr. Jentink from Javan examples now in the Leyden Museum. 
17. Mus alticola, sp. n., Thos. Ann. Mus. N. H. (6) ii. p. 408 (1888). 
a, b. <? ? . 8600 feet. 24/2/88. $ . Type. 
Fur mixed with flexible spines both above and below. General colour above a peculiar bluish grey, 
not speckled or grizzled, darker along the median line. Dorsal hairs and spines creamv white basallv, 
gradually darkening to grey terminally. Underside pale yellowish white, the hairs and spines uniformly 
of this colour to their bases ; the line of demarcation on the sides not very sharply defined. Hands and 
feet white, the hairs short and fine ; fifth hind toe (without claw) reaching nearly to the end of the first 
phalanx of the fourth. Tail finely ringed, the rings averaging about 10 or 11 to the centimetre; short- 
haired, sharply bicolor from base to tip, brown above, yellowish white below. 
Dimensions, $ :—Head and body (probably stretched), 177 millim.; tail 162; hind foot32; heel to 
front of last foot-pad 16. 
Skull : tip of nasals to lambda (junction of sagittal and lambdoid sutures) 34; nasals, length 15 ; 
interorbital breadth 7*4; palate, length 19; length of anterior palatine foramina 6 ; upper molar 
series 5'8. 
