OLDFIELD THOMAS A^D E. C. WEOUGHTON— MAMMALIA. 515 



nasals 12 ; diastema lO'S ; palatilar length 17-5 ; palatal foramina 7-6 ; length of upper 

 molar series 7. 



Type. Female. B.M. no. 6.7.1.75. Original number 38. Collected 16th January, 

 1906, by Mr. K. E. Dent. 



No species of Basymys have been hitherto described from this part of Africa, 

 the nearest being the Lower Congo B. hentleyce, from which the present animal diilers 

 by the characters above mentioned. From the D. montanus of the higher altitudes of 

 Ruwenzori it is, of course, at once distinguishable by its shorter coarser fur and much 

 longer tail. 



[Numerous on Euwenzori from 6000 ft. up to 9000 ft. They inhabited chiefly the 

 bottoms of the valleys near streams, but were also caught occasionally on the drier 

 ridges.— E. B. W.] 



77. Aevicanthis massaicus Pagenst. 



6 . 26, 60, 64, 85, 208, 210, 631. S . 8, 58, 281. Mubuku Valley, E. Ruwenzori. 

 6000-6600 ft. 



6 . 298. Mokia, S.E. Ruwenzori. 3400 ft. 



6 . 683. Fort Beni, Semliki Valley. 



3 in spirits. Mpanga Forest, Fort Portal. 



$ . 317. Lake Kivu. 4900 ft. {Douglas Carrathei's.) 



[Very numerous both on Ruwenzori up to 7000 ft. and on the plains below the 

 mountains. This species is apparently both diurnal and nocturnal. Native name, 

 " Naruberi."— R. B. W.] 



78. Aevicanthis macculus, sp. n, (Plate XXIV.) 



d . 304. ? . 303, 679. Mokia, S.E. Ruwenzori. 3400 ft. 



An Arvicanfhis of the A. pulcliellus group, but smaller than that species. 



Colouring very much as in A. piilchelhis or A. massaicus, but the pale spots 

 smaller ; the yellow marking on the face, so noticeable in A. massaicus, almost 

 entirely wanting. 



Dimensions of the type : — • 



Head and body 105 mm. ; tail 111 ; hind foot 22 ; ear 17. 



Skull: greatest length 28; basilar length 22-3; greatest breadth 13-4; brain-case 

 breadth 11'6 ; interorbital breadth 4-9 ; diastema 7 ; length of upper molar series 4-8. 



Type. Adult female. B.M. no, 6.12.4.57. Original number 679. Collected by 

 Mr. R. B. Woosnam. 



The male is rather younger than the type, and the other female is still younger, but 

 allowing for this they correspond in all essential characters with the type. This is 

 the smallest form of spotted (as distinguished from the striped, A. harbarus group) 

 Arvicanthis yet described. 



3t2 . 



