FASCICULI MALA TENSES 
3 1 
General colour grizzled fulvous, having a slightly darker area from the 
nose and down the middle of the back* Under parts pure white, somewhat 
tinged with ochraceous, the line of demarcation not being very distinct. Outer 
sides of all four limbs greyish-brown, inner sides of fore limbs white, of hind 
limbs dark brown. Feet dark brown. Tail slightly longer than the head and 
body, uniform black in colour, and covered with short stiff hairs. Ears some¬ 
what elongated and naked. 
SkulL The skull, which is elongated, is chiefly noticeable for the large 
bullae. The nasals, which are of a fairly level breadth throughout their length, 
end in a line with the posterior margin of the praemaxillae. The supraorbital 
ridges, which are not well marked, end about half-way across the parietal. 
The anterior root of the zygoma bends abruptly outwards about its centre. 
Viewed from below the most conspicuous features are the audital bullae, which 
are very large and rounded, compressing the basioccipital and making it narrow. 
Dimensions of type (measured in the flesh) -Head and body, 151 mm. ; 
Tail, 196 mm. ; Hind foot, 35 mm. ; Ear, 17 mm. 
SkulL Greatest length, 44 mm. ; Basal length, 33 mm. ; Palatal length, 
19 mm. ; Diastema, 11 mm. ; Length of incisive foramina, 7*5 mm. ; Length 
of nasals, 16 mm.; Zygomatic breadth, 19-5 mm.; Breadth of brain case 
at posterior roots of zygomata, 15 mm. ; Length of molar series, 7*5 mm. ; 
Length of bullae, 8 mm. ; Length between external and internal auditory 
meatus, 7 mm. ; Breadth of basioccipital anteriorly, 8 mm. 
Habitat. Sungkei, South Perak. 
Type. Adult female, collected on the 8th February, 1902. Original 
number, 223. 
This species must be considered as allied to the Mus rattus group, although 
the large size of the bullae give the skull a very distinct and easily recognizable 
appearance. Superficially it is somewhat like Mus validus> Mill., only con¬ 
siderably smaller ; whilst its nearest ally would appear to be Mus neglect us, 
from Borneo. 
* Trapped among old tree stumps near a patch of recently cleared jungle. 1 
1 append a list of names with references to original descriptions and type 
localities, showing the main groups into which some of these Oriental rats 
may be classed. The list has no pretence at being complete or exhaustive, 
but it may, perhaps, by rough subdivision, enable more competent workers to 
attack and put in order the unwieldly genus Mus . 
E 
