MUS SETIFER. 
East India Company's Museum, in Colonel Mackenzie's collections. The Mus 
perclial is identified with the Mus giganteus by Fischer ; but GeofrYoy, in his Genus 
Ecliimys, distinguishes it with the specific name of perchal; and Desmarest has 
placed it in the second section of the genus Mus, to which likewise the Mus setifer 
belongs. 
The Tikus-wirok is found in Java at the confines of forests and woods, and, 
agreeably to my observations, it rarely approaches the villages and dwellings of the 
natives. It is very shy in its habits, and is with great difficulty surprised and 
seized. No with standing continued and careful research, I obtained but a small 
number of specimens, and by my inquiries I learned but few particulars as to its 
food and manners. The natives describe it as a bold and mischievous animal ; the 
robustness of its form, and the remarkable size and strength of its front teeth, agree 
with this character. In its more prominent features, our animal agrees with several 
species of the first section of this genus ; its nose is evidently employed in burrowing 
the ground in search of its food, and its tail has the character of those species which 
are in the habit of frequenting the water. 
A species of Rat, which greatly resembles the Mus setifer, and which belongs 
to the same section of the genus, is described and figured by Dr. Hamilton, with 
the name of Mus Iciua. It has, in a very conspicuous degree, the character of the 
projecting dorsal and anal bristles. In its size it somewhat exceeds the Mus decu- 
manus. It lives in the neighbourhood of lakes, and the native name of Icria is 
significant of its superior strength and size. 
