On Two new Jerboa-rats. 315 
widest basally ; m—cu immediately beyond the fork of M, so 
the basal section of M; is almost lacking; petiole of cell M, 
equal to or a little shorter than the second section of M1, 
and in alignment with it; cell 2nd A broad. 
Abdomen with the basal tergite dark brown; remaining 
tergites black; sternites obscure yellow, segmeuts 6 to 9 
and the caudal margin of 5 infusecated. Male hypopygium 
inverted as in the genus, the ninth tergite occupying a 
ventral position, consisting of two rounded black lobes that 
are separated by a deep U-shaped notch. 
Hab. New Zealand (North Island). 
Holotype, &, Ohakune, altitude 2060 feet, October 10, 
1921 (7. &. Harris). 
XXAIX.—Two new Jerboa-rats (Notomys).. 
By OLDFIELD THOMAS. 
(Published by permission of the Trustees of the British Museum.) 
AMONG the mammals collected by the late Mr. W. Stalker 
in the neighbourhood of Alexandria, Northern Territory ot 
Australia, is a nice series of a jerboa-rat from Alroy, which 
in my account of the collection was recorded as Notomys 
mitchelli *—a determination which was accepted in my recent 
notes on the genus Notomys ft. 
There appeared, however, to be some doubt as to what tlie 
true Notomys mitchelli of the Lower Murray River was, and 
I appealed to Mr. Troughton at Sydney for information 
about the type, while in the meantime the characters of the 
species were drawn up from the Alroy series. 
Mr. Troughton now tells me that he has examined the 
incisors of the original specimens of ‘f Dipus mitchelli,” and 
finds that they are distinctly orthodont, not opisthodont as 
in our northern specimens and as stated in my description of 
the species. 
Since writing the paper on Notomys, I have had lent me 
by the Liverpool Museum a number of Australian Muride 
received by them from Mr. Gould, and among these there 
are two jerboa-rats (nos. 246 and 246a) from the Gawier 
* P. Z. 8. 1906, p. 539. 
+ Ann, & Mag. Nat. Hist. (9) viii. p. 586 (1921). 
21* 
