328 A memoir on the Rats and Mice of India. [No. 4, 
On careful comparison of numerous specimens from Afghanstan, 
Sindh, Upper Hindustan, Lower Bengal, Midnapore district, Madras 
Presidency, and Ceylon, I am satisfied that all belong to one and 
the same species; the differences which have been stated to exist 
being merely indicative of individual variation. 
A second species, however, inhabits Afghanstan,—the G. ERY- 
THROURA, Gray, Ann. Mag. N. H. X, (1842), p. 266: wide also 
J. A. 8. XV. 139, Dr. Gray states—“ Hab. India, Afghanstan.” I 
doubt if it inhabits India, any more than does his Alactaga indica, 
ibid. p. 262, from “ India, Candahar, at Quetta ;” or his Lagcomys 
RUFESCENS, zbid. p. 266, from “ India, Cabul;” these latter animals 
are not at all hkely to be found on the Indian side of the passes 
into Afghanstan, but are inhabitants of a region possessing essen- 
tially an European climate. 
Genus Nesoxia, Gray. 
Ann. Mag. N. H. X. (1842), p. 264. “ Cutting teeth very large, flat in front, 
and smooth ; grinders 3-3 ; front upper, large with three cross ridges ; the middle 
oblong, and the hinder much narrower behind, each with two cross-ridges ; hinder 
each with two ridges, the hindmost smallest, rather narrow behind ; tail short, 
thick, with whorls of scales and scattered bristles ; toes 4-5, moderate, the three 
middle sub-equal, long, the outer moderate; claws small, compressed ; front 
thumb tubercular, with a rudimentary claw; ears moderate, naked. 
«This genus is easily known from Mus by the large size of the cutting teeth 
and the comparative shortening of the tail; it appears to be intermediate to 
the Rats and Ruizomys,” (J. H. Gray). 
I have studied both Moroma and Ruizomys alive, in their indigenous haunts, 
and living examples of both of them ; and can perceive no particular approxima- 
tion in the instance of these two genera. 
N. 1nptca; Mus indicus, Geoffroy, Desmarest, p. 474; Lesson, 
Manuel, p. 266; Brandts Maz, p. 114, t. 85; Schinz, Synopsis 
Mammatlium, 11.174; Arvicola indica, Gray, Hardw. Ill. Ind. Zool. 
“M. supra cano-rufescens, subtus canescens; pedibus dorso concoloribus, 
cauda corpore paululum breviore ; auriculis magnis, rotundatis, fuscis, nudius- 
culis; cauda nigricante. Pili omnes basi cami. Magnitudine M. decwmani. 
Habitat. circa Pondichery.” 
In his Catalogue of the specimens of mammalia in the British Museum, Dr. 
Gray cites the name M. indicus, Geoffroy, as a synonym of his Mus Kok; the 
former name having the priority by many years; but in his subsequent Cata- 
logue of the specimens presented by B. H. Hodgson, Esq. to the British 
Museum, Dr. Gray gives M. indicus, Geoff., as a separate species, and refers to 
