TWO NEW RATS FROM CENTRAL AUSTRALIA 
7 
ring the whole,” but this is not the case in a dry skin though 
it applies to wet (spirit) specimens. 
The subspecies may therefore he described as being a small, 
brightly-coloured, long-haired, desert form of the northern 
species. 
Also present amongst the additions to the Spencer mam- 
mals are two examples of a new Jerboa Mouse. Equally as 
large as Podanomalus longicaudatus, the new species has a 
glandular area as in Notomys (5). Its large size, compara- 
tively short tail, and extremely long ears, at once separate it 
from all known species except possibly N. mordax, which was 
described from a skull only. With the latter it does not agree 
either in character or dimensions, and is therefore described 
as 
Notomys ampins sp. nov. 
Size . — Largest of the genus. General colour about sayal brown 
scarcely grizzled with darker hairs and almost uniform over the whole of 
the dorsal surface. Dorsal fur (16 mm.) deep mouse grey for a little more 
than half its length, then cinnamon-buff darkening to clay at the tip. Head 
paler; cheeks and upper lip almost white. Ears very long and bluntly 
pointed ; sparsely clothed on outer surface with adpressed tawny hair, inner 
surface with a few scattered silvery hairs towards the tip. Gular glandular 
area well marked but without a fold of skin at the lower border. Sides of body 
very little lighter; well marked line of demarcation between the dorsal and 
ventral colouration. Ventral surface yellowish white; hairs basally smoky- 
grey, paler on chest and throat. Tail yellowish-brown above almost to tip ; 
underside and tip white. Manus and pes white; poorly clothed with silvery 
adpressed hair. Pes heavy (6 mm. at base of toes 2.3.4) ; hallucal pad 
present. 
Skull . — Generally conforming to generic characters, but with a heavy 
muzzle and a small narrow braincase. Bullae medium (anterior-posterior 
length three-fourths of diastema). 
Teeth . — Crown pattern of molars typical of genus. Incisors heavy and 
markedly opisthodont (index of incisors 50°). 
Habitat . — Central Australia. Type locality, Charlotte Waters. 
Type . — In National Museum, Melbourne; female, C.512. 
Dimensions of Type (measured from spirit). — Head and body, 143 mm.; 
tail, 153 mm. ; hind foot, 43 mm. ; ear, 35 mm. 
Skull . — Greatest length, 41 mm. ; basal length, 35 mm. ; greatest breadth, 
21 mm; nasals, 15-5 X 4 mm.; interorbital breadth, 6 8 mm.; palate length, 
18 mm.; breadth outside M^ 8 8 mm.; breadth inside M^, 4 mm.; palatal 
foramina, 7 5 X 2 mm.; diastema, 9-3 mm.; upper molars, 7 5 mm. 
The second specimen, also from Charlotte Waters, is a female. 
The species should be easily identified by its large size 
and extremely long ears. 
