142 Mr. O. Thomas on 
Asia Pithechirus, Hapalomys, and many others from the 
terrestrial forms found there. 
A second species formerly put in Mus is the curious white- 
tailed M. woosnami, Schwann*, of Bechuanaland, which 
is even more decidedly different from any Rattus than is 
Thallomys nigricauda. Its unusual proportions, with the 
tail only about equal to the length of the body without the 
head, the entire absence of supraorbital ridges, and the struc- 
ture of the molars, of which m’ is greatly reduced and 
simplified, all testify to its being an animal which could not 
by any possible stretch of the genus be nowadays put in 
Rattus. Nor is any other genus more nearly related to it, 
though there is about it a certain superficial resemblance 
to Saccostomus which a closer study soon shows to be 
deceptive. 
As Mr. Schwann has given a full description of the 
distinctive characters, with figure of the animal, I do not 
propose to redescribe it, but simply suggest for it the name 
derived from its general pallor and white tail of 
Ocnromys, gen. nov. 
Genotype, Ochromys woosnami (Mus woosnami, Schwann). 
XVI.—A new Taphozous from the Sudan. 
By OLDFIELD T'HOMAS. 
(Published by permission of the Trustees of the British Museum.) 
AMONG a number of small mammals collected in the Sudan 
by Major J. Stevenson Hamilton, and sent to the British 
Museum for determination by the Wellcome Research 
Laboratories, Khartoum, there occurs a specimen of the 
following new bat, which I have great pleasure in naming in 
honour of its discoverer :— 
Taphozous hamiltont, sp. n. 
A fairly large species of the group with a naked gular 
patch in the female—a pouch therefore probably present in 
the male. 
* P, Z. S. 1906, p. 108, pl. vi. (animal), 
