BODEN KLOSS: Rats and Mice. 119 
II. Mice. 
Dr. K. W. DAMMERMAN, Director of the Zoological Museum at Buiten- 
zorg, has submitted to me for determination a small collection of mice. 
I find amongst them two forms or species. 
1. Mus musculus homourus. 
Mus homourus Hodgson, Ann. & Mag. Nat. Hist, XV, 1845, p. 268 (Nepal). 
Specimens examined: 
2 9, Sabang, Poeloe Weh, N. Sumatra. Mammae 10 
1 0‘ 3 2. Koetaradja, Atjeh, En 5 Ee 8 
2 9. Fort de Kock, W, Sumatra. N 10 
2 o 12. Blinjoe, Bangka. : 10 
1 9. Serasan, S. Natoena Ids. a 8 
2 & 229. Buitenzorg, Pekalongan & Probolinggo, Java. 5 10 
2 © Pamekasan, Madocra. = — 
1 o 32. Lombok. 5 8 
Ick Bima, Soembawa. — 
1 o 12. Moena Id, S. E, Celebes. 3 8 
1 © 22. Taroena, Sangir Ids, N. Celebes. 2 10 
All these appear to be the common Asiatic house-mouse of which Mr. R. C. 
WROUGHTON (who has a better acquaintance with the European form than I have) says 
that it differs from the typical animal in having the lower parts strongly washed with 
ochraceous instead of being bluish grey there. !) 
The Asiatic animal, WROUGHTON states ?) should bear the name Mus urbanus 
HODGSON. But since WROUGHTON considers homourus te be synonymous with the latter 5) it 
cannot be called urbanus as homourus has page priority. I therefore use the name 
homourus here for I have no material to show whether the Malaysian mouse is different 
from the Indian one: but if it is it will probably have to be called Mus musculus rama 
CANTOR #). 
The specimens listed cannot be distinguished from each other: the mammae are 
probably always 3—2= 10; for in cases where only eight are recorded I expect the 
taxidermist has omitted to count the anterior pectoral pair. 
The feet vary considerably in colour: they are either dark or white throughout, 
dark with white digits, or pale brownish white. 
One finds in passing eastwards from the Malaysian sub-region a marked 
loss of teeth. In the 18 Malaysian specimens examined the posterior upper 
molar is missing on one side in one example only and both posterior lower 
molars in five examples. In the Lombok series both posterior upper molars 
have disappeared in three out of the four skulls and all the posterior lower 
molars are missing. In two of the Sangir specimens all the posterior molars 
are absent: in the Moena skulls only a single lower molar has been lost. 
The sockets for these teeth cannot be perceived. 
1) Journ. Bombay Nat. Hist. Soc,, XXVI, 1920, p. 958. 
2), AO Gli 931028: 
3) tom. cit, p. 959. > 
4) CANTOR in Blyth, Journ. Asiat. Soc. Bengal, XXXIV, part 2,1865, p. 194. Malacca . 
