Mem. Nat. Mus. Vict., viii, 1934. 
A NEW SPECIES OF MOUSE, PSEUDOMYS ( GYOMYS ), 
AND A RECORD OF THE BROAD-TOOTHED RAT, 
MASTACOMYS, FROM VICTORIA. 
By C. W. Brazenor, National Museum of Victoria. 
Plate XVIII, figs. a-e. 
Family MURIDAE Gray 1821. 
Subfamily Murinae Baird 1857. 
Genus PSEUDOMYS Gray 1832. 
Subgenus Gyomys Thomas 1910. 
Pseudomys ( Gyomys ) fumeus sp. n. 
A blue-grey mouse allied to the albocinereus group, but larger and slightly 
darker than other species. Dorsal fur long (15 mm.), soft, fine ; slate-grey 
for four-fifths of its length, tipped with mouse grey (Ridg.). Long hairs 
(20 mm.) numerous, black, imparting a cool tone to the whole. Sides of body 
lighter, with fewer long hairs. Ventral surface greyish-white ; fur slaty for 
three-fifths of its length, tipped with soiled white, the grey showing through. 
Line of demarcation not sharp. Head colouration as body but lighter on cheeks 
and muzzle ; upper lip greyish white ; a few dark hairs around eve. Ears 
long ; purplish-grey in freshly killed animal ; sparsely clothed with white and 
grey adpressed hairs. Mysticial vibrissae with longer hairs (39 mm.) bicoloured, 
base black, tips white ; shorter hairs white. Manus and pes white ; well 
clothed with silvery-white adpressed hair which forms a fringe around nails. 
Tail longer than head and body ; greyish-brown above, white on sides and 
below ; well clothed with hair 3 4 scales in length which, nevertheless, does 
not completely hide scales. 
Skidl. — Smooth, rounded, typical of genus. Muzzle long, narrow ; nasals 
slightly tapering, but articulation with frontal at least 2 mm. in extent. 
Zygomata diverging posteriorly, straight when viewed from above. Anterior 
edge of zygomatic plate sloping forward to its base ; very slightly concave. 
Pterygoidal region as described for subgenus, entopterygoids but slightly 
raised, ectopterygoids forming a raised bead only on anterior portion of floor, 
which is wide and flat. Palatal foramina diverge from narrow anterior to 
open posterior, which reaches well behind M 1 , though in many Murines these 
characters vary considerably in a series of skulls and have but little diagnostic 
value. Bullae small, anterior-posterior length about half that of diastema. 
Teeth. — Comparatively large and heavy. Laminae not tilted back ; no 
anterior cingular cusp on M 1 . Upper incisors orange, lower pale homy yellow. 
Dimensions of type measured in the flesh. — Head and body, 115 mm. ; tail, 
134 mm. ; hind foot, 29 mm. ; ear, 22 mm. 
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