266 MR. O. THOMAS ON RODENTS FROM S.wW. AFRICA. [Feb. 21, 
4. Saccosromus Laprparivs. (Plate XIV. fig. 2.) 
Saccostomus lapidarius, Peters, Reise n. Mossamb., Saug. p. 167 
(1852). 
Three specimens. Exact localities and dates not preserved. 
This rare species has hitherto been recorded only from Mozambique, 
where Prof. Peters collected his types. 
5. Mus (Isomys) pumIttio, Sparrm. K. Vet.-Ak. Handl. 1784, 
p- 236. 
Two specimens. a,2, Table Mountain, November 30; and 4, ¢, 
‘‘between Aamhouf and Hountop,” Great Namaqualand, June 8, 
1862. 
6. Mus (LeGGapa) MINuUTOIDEs, Smith, S. Afr. Quart. Journ. 
ii. p. 157 (1834). 
One specimen. Damaraland. 
7. Mus sttaceus, Wagn. Arch. f. Naturg. 1842, 1. p. 11. 
Four specimens. a & 6, Otjimbinque, August 19 and 27, 1866 ; 
e & d, no exact localities. 
8. Mus NIGRICAUDA, Sp. n. 
One specimen. 6, Hountop R., Great Namaqualand, June 1, 
1862. 
For description see below. 
9. Mus coucua, Sm. App. Rep. Exp. p. 43 (1836). 
One specimen. Elephant’s Vley, October 30, 1859. 
10. Mus, sp. 
One specimen. No exact locality. 
There is thus one new species, No. 8, in the collection: and No. 10 
might also turn out to be new; but it is represented by such a very 
indifferent specimen that I cannot determine this point with certainty. 
The following is a description of No. 8, a very well-marked species, 
quite distinct from any other African Rat. 
Mus niericaupa, sp.n. (Plate XIV. fig. 1.) 
Fur rather long and coarse, composed of but one kind of hair, 
there being no under-fur. Centre of back mixed yellow-and black, 
the greater part of the hairs having yellow distal halves, while others 
are wholly black. Sides of the head and body mixed white and 
black, the separation from the upper yellowish colour fairly well 
marked. Belly-hairs pure white to their bases. Ears rather large, 
thinly covered with short greyish hairs. Feet white above, the 
hairs longer at the ends of the toes, so as to conceal theclaws. Tail 
slightly shorter than the head and body, nearly naked at its base, 
but thickly covered for its distal half both above and below with 
rather long shining black hairs, which form more or less of a pencil 
at the tip. Hind feet proportionally short, the six pads large and 
