13 
usual in the genus, especially on the apical half, where the scales are 
hidden by them ; those at the point of the tail measure upwards of 
an inch in length, and at the distance of two inches from the point 
they average about an inch in length; on this part they have a rusty 
hue, but on the remaining portions they are black. On the upper 
parts of the body the shorter hairs are of a yellowish brown colour, 
but the longer interspersed hairs being numerous, and of a black 
colour, give a deep general tint to these parts. The under parts of 
the body are of a rusty yellow colour, tinted with brownish on the 
neck and chest, and having a more decided rust-colour on the abdo- 
men. 
The skull approaches that of Mus giganteus in general form, but 
is rather narrower and longer ; the palatal portion is broader, and the 
incisive foramina are shorter, terminating posteriorly, about one- 
eighth of an inch anterior to the foremost molars ; whilst in M. gi- 
ganteus these foramina terminate in a line with the front molars, or 
rather behind that line; the nasal bones are longer and rather nar- 
rower, and the occipital portion of the cranium is decidedly smaller. 
The principal dimensions, taken from the skeleton, are as follow :— 
in. lin. 
Length from tip of nasal bones to end of sacral vertebree 10 4 
MIE OT TAU) si oie nid 3) oie aa e'aye Say he aidando sei ERE OS * 
Length of tarsus and claws .......... Ad whsd tape thi 2 8% 
Meriear cae GUE ee es SURFS WP a ee Oe 2° 65 
UE UF 2 Rn ae Be Tae 1 3? 
Length of nasal bones .........- +--+ sees e eee 1 08 
Distance between incisors and molars of the upper jaw. O 94 
Width between molars ..... picitig ty x ty aot age dad ens si piven lis. ste 
Length of incisive foramina ............-+..05-+0% 0 5 
SEER GH OCCIDIG LS Stow va siels toe Peres oe SORE AU 0 8 
Mus pexicatutus. Mus supra pallide fusco-flavus ; corpore ad 
latera flavescente, subtis albo ; caudé mediocri supra fuscd, subtis 
ad basin albescenti ; auribus parvulis ; pedibus gracilibus, albis. 
‘ 
une. lin. 
Longitudo ab apice rostri ad caude basin.... 2 5 
CORE Aas wiv one ste eno 5: 2 2 
tarsi digitorumque.......... see S 
ab apice rostri ad basin auris .... O 8 
PRR S i She, 0 OWE wo oie Wa ato’ 0 32 
In colouring the present species greatly resembles the Mus syl- 
vaticus of Europe, but it is a trifle paler; its size is less than that of 
the common mouse (Mus musculus, Auct.). The fur is soft and 
short ; that on the upper parts of the body is of a pale yellow-brown 
colour. The sides of the body are of a delicate yellow tint, and the 
lower parts of the sides of the muzzle, the chin, throat, and whole 
under parts, as well as the feet, are pure white; along the mesial 
line of the abdomen and on the throat the hairs are of an uniform 
colour to the base. The feet are slender, and the ears are rather 
