REVISION OF AUSTRALIAN JERBOA MICE. 
lighter, upper lip white. Ears bluntly pointed at tips ; outer surface with 
numerous fine russet hairs, inner surface with a few silvery hairs at tip. Gular 
glandular area well defined ; clothed with solid, silky hair. Ventral surface 
yellowish-white, hairs basally a faded brownish-grey. Tail russet-brown above, 
white below to tip. Manus and pes white. Pes heavy (4.5 mm. at base of 
toes 2.3.4.). Hallucal pad present. 
Skull. — Similar to mitchelli ; large and heavy. 
Teeth. — Index of incisors 50°-56°. 
Habitat. — Central South and Southern West Australia. 
Type. — In National Museum, Melbourne, ?, No. C38, from Ooldea, South 
Australia. 
Dimensions of type (measured from spirit). — Head and body 98 mm. ; tail 
145 mm. ; hind foot 37 mm. ; ear 23 mm. 
Skull, Greatest length 32 mm. ; basal length 25.5 mm. ; greatest breadth 
16 mm. ; nasals 12 x 3 mm. ; interorbital breadth 5.3 mm. ; palate length 
15 mm. ; breadth outside m. a 6.5 mm. ; breadth inside M. 2 3.3 mm. ; palatal 
foramina 5.8 x 1.8 mm. ; diastema 7.3 mm. ; upper molars 5 mm. 
Ten specimens examined ; Ooldea, S.A. ; Central Australia ; West Aus- 
tralia. Nat. Mus. Nos. C38-42. 
Intensity of reddish colouration varies in the series of skins 
examined. The most deeply tinted specimen is reputed to be 
from West Australia, and taken in 1865. In this the basal half 
of the fur is a strong russet, as, to a lesser extent, is the general 
colour of the animal. The majority, however, have not this 
intensity of colour though they are warm in tone and lacking 
the ochraceous colouration of typical mitchelli. 
Notomys alexis Thomas. 
Notomys mitchelli Thomas (nec Ogilby), Proc. Zoo. Soc. Lond., 1906, 
p. 539 ; id . , Ann. Mag. Nat. Hist. (9), VIII, p. 539, 1921. 
Notomys alexis Thomas, Ann. Mag. Nat. Hist. (9), IX, p. 317, 1922. 
Ascopharynx fuscus Wood Jones, Rec. Sth. Aust. Mus., Ill, p. 3, 1925 ; 
id. Mamm. Sth. Aust., Ill, p. 344, 1925. 
Short-haired. General colour sayal-brown ; much more uniform and less 
grizzled than in any other species examined. Dorsal fur (11 mm.) slate for 
about basal half, then cinnamon with darker tips. Cheeks and upper lip white. 
Ears comparatively short ; tips bluntly pointed ; outer surface with a few 
brown hairs, inner surface with a few silvery hairs. Gular glandular area very 
variable, some specimens having a well-formed fold of skin along posterior 
border forming a pouch, others simply a flat area ; between these extremes are 
intermediate stages. Basal colour of hair on ventral surface white to base 
on anterior portion of body, grey basally on posterior portion ; in some speci- 
mens the basal grey is a very light tint and confined to inner side of hind 
limbs ; in others a darker grey extends to lower chest. Tail brown above, 
white below ; tip not as bushy as in other species. Manus and pes white! 
Pes comparatively stout (4 mm. at base of toes 2.3.4.). Pads either three or 
four, the hallucal being present in slightly less than half the number examined. 
[SO) 
