808 ON SOME RODENTS FROM BRITISH souTH AFRICA. [Nov.17, 
underside including the upper lip and feet, pure white, line 
sharply defined ; ears and tail brown, naked, the latter paler on 
the underside. 
Type, No. 33, ¢, Essex Farm, Matabeleland; 8 Oct., 1895. 
General colour much like Mus sylvaticus, but with the smoky 
bloom peculiar to the genus. 
Skull, old male :—Greatest length 25°5 ; br. zyg.12°5; br. brain- 
case 11°3; nasals 10°5x%3; interpar. 3x85; basal length 21; 
bk. of ins. to bk. of pal. 12-5; pal. to foram. mag. 7; ins. foram, 
5°8; upper molar series 4; outside m.1 1-6; inside m.1 3:1; 
diastema 6°5. Mandible: gr. length (bone) 13:1; to tip of 
incisors 16. 
Near A. wilsoni, Thos., but larger. 
8. GEORYCHUS NIMRODI, sp. n. 
4 skins, 1 ad., 3 juv.; 5 skulls, 2 ad., 3 juv. All taken in Nov. 
Size much as in G. hottentottus, Less., and G. darlingi, Thos.: 
differing from the former in its drab colouring, and from the latter 
in the absence of the triangular white patch on the nape. The 
skull is at once distinguished from its allies by the ascending 
processes of the premaxillaries not extending backward beyond the 
nasals, so that the suture between these bones and the frontals 
forms a simple slightly bowed line, very distinct from the com- 
plicated dove-tail pattern found in most of the Georychi. The 
sagittal crest is only faintly developed, the interparietal bone being 
rounded. The zygomata are not so much bowed out, anteriorly as 
in G. hottentottus, and in this it resembles G. darling?, as also in the 
thickened outer walls to the anteorbital foramina. In the type 
specimen these foramina are very small, on one side indeed being 
little more than a pin-hole, but this is a somewhat variable character 
in this species. From the lachrymal projection the skull recedes 
abruptly to the narrowest part of the constriction, with no posterior 
lateral inflation of the frontals in the interorbital region. The 
postnarial aperture is rather wide, the back of the palate being 
slightly cut away on either side, leaving a projecting point in 
the middle line; the posterior opening of the alisphenoid canal 
is larger than in G. hottentottus. 
I select as the type a specimen marked by the collector, “ No. 46, 
Mole, 3, caught 18 Nov., 1895. Head and body 147 mm., hind 
foot 245. Kaffir garden, only appeared on surface since rainy 
season began. Locality, Essex Farm, Matabeleland.’”—J. C. S. 
Measurements of skull of type: basilar length 31; greatest 
breadth 27. 
This new species is unquestionably nearly related to G. darlingi, 
but outwardly as well as craniologically the two forms are easily 
distinguished. 
