180 MESSRS. O. THOMAS AND H, SCHWANN ON [Feb. 2, 



decidedly greyer than in A . picmilio ; ears bright tawny as in the 

 typical form, but more strongly contrasted owing to the greyer 

 colour of the head and neck. 



Dimensions of the type, measured in the flesh : — Head and body 

 118 mm. ; tail 128 ; hind foot 28; ear 18. 



Skull — basilar length 24 mm. ; length of upper tooth-series 5. 



Hab. Klipfontein. 



Tppe. Female. Original no. 514. Collected 16 June, 1903. 



This Namaqua representative of the common A , ptctnilio may 

 be distinguished from its Cape ally by its paler, gi'eyer colour, 

 and especially by its much gi'eyer flanks. 



" ' Streep-muis ' of the Dutch. 



" Inhabiting the heaps of stones along the railway and the 

 stone walls of the native gardens. 



" Common and exclusively diurnal. It may frequently be seen 

 sunning itself on some flat rock or sandy patch in the heat of the 

 day. Its food, so far as I have seen, is entirely vegetable." — 

 C. H. B. G. 



21. Bathyergus janetta Thos. & Schw, (Plate VI. fig. 2.) 



Bathyergus janetta Thos. &, Schw. Abstr. P. Z. S. 1904, no. 2, 

 p. 6 (Feb. 9th). 



S . 551, 541, 562, 544. $ . 546, 548, 545, 552, 554, 564, 553. 

 Port Nolloth. 



Much smaller than B. mai'itimtis, the back with a dark median 

 band. 



General ground-colour not matei'ially different from that of the 

 Cape species, i. e. " drab-grey " ; but the whole dorsal area, for a 

 breadth of about 2 inches, is seal-brown, contrasting markedly 

 with the drab-grey of the shoulders and sides. Under surface 

 blackish- slaty, rather darker than in B. maritimus ; chin with 

 a white sharply-defined patch. Head wholly blackish, except 

 that there is sometimes a narrow white line along the top of the 

 nose. Area round ear white, bright colour of flanks commencing 

 just behind ear. Proximal part of limbs dark slaty ; hands and 

 feet white. Tail broad, flattened, its central part pale brown, its 

 fringing hairs dull whitish. 



Skull conspicuously smaller than in B. maritimus, its shape, in 

 fully adult examples, more like that of young specimens of the 

 Cape species. Brain-case smooth and rounded, the ridges and 

 crests at a minimum. Interorbital region broad, smoothly rounded. 

 Proportions of nasals as in B. maritimus. Palate less produced 

 backwards. Bullae rather more swollen. 



Incisors deeply and simply grooved as in B. maritimt(,s, their 

 breadth about as in half-grown specimens of that species. 



Dimensions of the type, measured in the flesh : — Head and 

 body 181 mm. ; tail 43 ; hind foot (s.u.) 34. 



Skull — greatest length 46*5 mm. ; basilar length 40'5 ; greatest 

 breadth 28*7 ; nasals 3*6 x 15"4 ; interorbital breadth 9*5 ; least 

 breadth behind zygomata 18'8 ; greatest mastoid breadth 24 ; 

 diastema 14*4; palate length 14'5; greatest diameter of bullae 



