Mammih from Lake Ngamiy cfcc. i^99 



It is interesliiig to note that Mr. Woosnam obtained four 

 8})cciiiH'iis of this species near the ^Iolo|)0 River, not very far 

 north of Kuruniaii, iho ty|)i' k)cality of S. Iiiilf, Scliwanii. 

 S. hiIJa', compared with this new series of .S. anderssoin\ 

 appears as a very much darker animal, especially noticeuMe 

 in the yourtg specimens, the young of S. anderssoni being 

 rather paler than the a«hilts, while in S. hi/die tliey arc a 

 good deal daiker. 



*' 1 found this mouse plentiful on the locky banks of the 

 Molopo River and at several jjlaces in the Kalahari up to 

 Ngainiland. One was caught on an island in tho middle of 

 the C)kovango marshes. They feed largely on the beans 

 of the kameel-thorn (Acacia) trees." 



24. Arvicanth'is pumilio deserti^ subsp. n. 



? . l;{. Lehutitung, Kalahari. 



? (in spirit). Kakia, Kalahari. 



A pale sandy-coloured form allied to Arvicajithis pumilio 

 griqiKf, Wrought. 



8ize and general proportions as in A. p. r/riqiuc. General 

 colour of upper surface pale sandy yellow (between putty- 

 colour no. 3 and |)ale ecru no. 3, 'Repertoire de Couleurti'), 

 rather j)aler on the flanks and sides of head. Dorsal stripes 

 much fainter and less evident than in ^1. p. gri(jucB, light 

 orange-brown in colour ; the two median stripes not pro- 

 longed forwards on to head. Ears covered with short 

 orange-coloured hairs ; no well-marked dark margin to ears. 

 Backs of hands and feet yellowish white. Entire underparts 

 white, w ashed with greyish buff. Tail light brownish yellow 

 above; underside white. 



tSkull larger than that of A. p. griqiia;^ with rather larger 

 auditory l^ulloe, flatter and broader Lrain-cjise, and broader 

 nasal?. Molar teeth rather larger than in A. p. griqucf. 



Dimensions of the type (measured in the Hesli) : — 



Dead and body 115 mm.; tail IIG ; hind foot 22-25; 

 ear 14. 



Skull: greatest length 2y-0 ; basal length iQ] condylo- 

 basal length 27*9; basilar length 24 "3 ; condylo-basilar 

 lengtb 26; zygomatic breadth 14'9; breadth of brain-caso 

 across squamosal region 12'6; interorbital breadth 4*7; 

 nasals, greatest length 11, greatest breadth 3-6, least 

 breadtii lb; jialatal length 14*5; palatilar length 12'5; 

 width of palate inside??/' 2*5; width of palate outsido m' 

 5*9 ; length of palatal foramina (] ; ]i03t-palatal 1< n-rtji 

 11*3; length of upi>er cheek-teeth 5. 



