FASCICULI MALATENSES 
29 
Skull. Greatest length, 40 mm. ; Basal length, 32 mm. ; Palatal length, 
19 mm. ; Diastema, ii mm. ; Length of incisive foramina, 7 mm. ; Length 
of nasals, 1 4 mm. ; Combined breadth of nasals: Anteriorly, 4 mm.; Posteriorly, 
1*5 mm. ; Zygomatic breadth, 19 mm. ; Interorbital breadth, 6 mm. ; Breadth 
of brain case at roots of zygomata, 14 mm. ; Length of molar series, 7 mm. 
Habitat. Ban Sai Kau, Nawngchik, and in the neighbouring State of 
Jalor. Also found in Perak and Siam. 
Type. Adult female. Ban Sai Kau, Nawngchik, collected on the nth 
September, 1901. Original number, 148. 
This rat may be easily recognized by its dark and uniform upper surface, 
short tail, black feet, and white under parts. In Mus rufescens the back is much 
lighter and not so uniform in colour, tail rather longer, and feet white. Mus 
rufescens has also a considerable longer ear. 
The series of eight individuals in the present collection is very uniform, 
and the Museum also contains specimens from Siam, so that it would appear 
to range from Burmah eastwards. 
Series received in present collection. 
Cyb. 2 $ ad. Ban Sai Kau, Nawngchik. nth September, 1901. 
(one of these is the type). 
c. $. Biserat, Jalor. 17th July, 1901. 
d-h. 2 $ y 39. Telom, Perak-Pahang boundary, alt. 4000'. January, 1902. 
Average measurements compared with M. rufescens : — 
Mus jalor ensis. Head and body, 145 (13 7- 15 2) mm. ; Tail, 165 
(151-177) mm. ; Hind foot, 30 (29*5-3i‘5) mm. ; Ear, 17*5 (19-17) mm. 
Mus rufescens (Siam). Head and body, 170 mm.; Tail, 184 mm.; 
Hind foot, 32 mm. ; Ear, 24 mm. 
Skull 
Greatest 
Basal 
Palatal 
Diastema 
Length 
Breadth of nasals 
Zygo- 
Inter- 
orbital 
breadth 
Breadth 
of brain 
case 
Molar 
length 
length 
length 
of nasals 
Anterior 
Posterior 
breadth 
series 
MM. 
MM. 
1 
MM. 
1 
1 MM. 
MM. 
MM. 
MM. 
MM. 
MM. 
MM. 
MM. 
M. jalorensts 
(Av. of 7 spms.) 
00 
>-ri 
317 
18 
1 
IO’2 
13 
4 
2 
i8-5 
6 
H 
7 
M. rufescens 
43 
34 
20 
12 
16 
5 
3 
20 
6-5 
15 
8 
‘ Not a house rat ; the Telom specimens came from deep jungle ; and the 
others were trapped in the rice-fields.’ 
