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lowing species of Squirrels have hitherto been recorded: Sciurus Mco- 
lor, alUceps, soricinus, notatus and insignis; and the supposition is 
allowed that in comparing it with these species its nearest ally can 
be pointed out. As its head and body measure about 145 Mm., we 
can let immediately the larger Sciurus Mcolor and alMceps out of con- 
sideration, meanwhile Sciurus soricinus is a much smaller form than 
our albino. Remain Sc. notatus and Sc. insignis; the skull of Sc. no- 
tatus is surprisingly broader between the orbits than that part of Sc. 
insignis, and our albino has that part of the skull not very broad 
but much more small like is the case in Sc. insignis. Notwithstan- 
ding its tail is somewhat longer than usually I can not fail in sup- 
posing that it in reality is an albino- variety of Sciurus insignis. Moreover 
the Java-Mammals are very well known, so that there would be but 
little room for the supposition that in Java is living an unknown 
species of Squirrel and that we have here a variety of an undescribed 
and new species! 
Mus. 
Mus setifer Horsfield. 
Java: Buitenzorg; skin: d ad. (608). 
This gigantic rat is the true Tikus-wirok of the Javanese described 
and figured by Horsfield. It perhaps may be the same species as Mus 
handicota Bechstein = M. malaLaricus and perchai Shaw = M. giganteus 
Hardwicke , but according to Hardwicke's description and figure (Trans. 
Linn Soc. 1804, Vol. VII, p. 307, tab. XVIII) M. giganteus has „the 
„last inch of the tail naked and differing in colour from the rest", 
a characteristic not mentioned in Horsfield's description of M. setifer, 
nor to observe in the adult cT from Buitenzorg under consideration. 
Dimensions of the adult cf in spirit: 
Head and body Mm. 325 
Tail „ 287 
Bar . „ 29X26 
Nose to eye „ 32 
Nose to ear „ 68 
Hind foot „ 54 
This specimen has been presented to Prof. Weber by Dr. F. H. 
Bauer from Buitenzorg. 
