A NEW SPECTES OF MOUSE. 
near future, to clear up this point, and to gather further informa- 
tion regarding the habits of the animal. 
Dimensions of Victorian Specimens of Mastacomys fuscus 
Thomas. 
BODY MEASUREMENTS. 
Reg. No. 
C199 : 
R5715 : J 
C134 : 2 
R5713 : $ 
mm. 
mm. 
mm. 
mm. 
Head and body 
173 
172 
162 
110 
Tail 
124 
123 
119 
85 
Hind foot 
32 
34 
31 
30 
Ear 
21 
21 
20 
17.5 
SKULLS. 
Greatest length 
40 
39 
34 
Basal length 
35 
34 
29 
Greatest breadth 
22.5 
22 
19 
Nasals 
15.8 x 5.8 
15.5 x 4.8 
13 x 4 
Interorb. breadth 
4 
4 
4 
Braincase, width 
16.3 
16 
15 
Palate, length 
22 
22 
19 
Palatal foramina 
8 
7.5 
6.8 
Diastema 
10.3 
10 
7.5 
Upper Molars 
10 
10 
9.5 
Plate XVIII. 
Pseudomys ( Gyomys ) fumeus sp. n. 
a. dorsal, b. ventral, c. lateral views of skull, d. molar teeth, e. pes. 
a, b, c, and ex 2. dx 8. 
References. 
1. J. Gould. Five New Mammals. Proceedings Zoological Society of London, 
1845, p. 78. 
2. O. Thomas. On Mammals from Western Australia. Proceedings Zoological 
Society of London, 1906, p. 776. 
3. H. H. Finlayson. Preliminary Descriptions of Two New Mammals from 
South Australia. T ransactions and Proceedings Royal Society of South 
Australia, LVI, p. 170, 1932. 
4. O. Thomas. New Australian Muridae of the Genus Pseudomys. Annals 
and Magazine of Natural History, Eighth Series VI, p. 609, 1910. 
[Id] 
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