Mammals from British East Africa. 529 



Dimensions of type (measured in the flesh) : — 



Head and body 120 mm.; tail 185; hind foot 25; 

 ear 22. 



Skull : greatest length 32*5 ; basilar length 25*5 ; condylo- 

 basilar length 27*5 ; eondylo-iueisive length 29*7 ; zygomatic 

 breadth 14'7 ; interorbital breadth 4*5; breadth of brain- 

 case (across squamosal region) 13 ; length of nasals 12 ; 

 palatilar length 11; post-palatilar length 11-7 ; width of 

 palate (inside m"") 2-5 ; length of palatal foramina 7-1 ; 

 length of upper cheek-teeth 4-7. 



Hab. South face of I\It. Elgon. Altitude 9000 feot. 



Type. Adult female. B.M. no. 10. 4. 1. 186. Original 

 number 433. Collected on November 13th, 1909. 



I have taken for the type of this new form a specimen 

 from a series collected by iNlr. Kemp in 1909 on Mt. Elgon ; 

 the only adult Rumruti example has an imperfect skull, but 

 it undoubtedly is the same form as that found at Elgon. 



The bright tawny colour of the dorsal surface and buffy 

 tint on the flanks readily distinguish this race from 

 T. ibeanus, a species that is noted for its dull olive-coloured 

 pelage. T. sur duster polionops, Osg., a more southern race 

 related to this Elgon form^ is less tawny on the sides of the 

 face and flanks ; and the general colour of the dorsal surface, 

 although distinctly reddish, is a good deal lighter. 



T. surdaster elgonis, Thos., geographically the nearest 

 ally of T. s. insiynis, is far paler and yellower in colour and 

 smaller in size. 



T. /o/'m^i, described by Heller in 1909 from Lake Nai- 

 vasha, is apparently quite unlike any other known member 

 of the genus, possessing dark facial stripes (like tiiose of 

 Epimys nigricauda^ and slate-grey bases to the hairs of the 

 belly. As regards T. surdaster, the general colour of the 

 dorsal surface and flanks is brighter and rather lighter in 

 colour than in this new form, a character that is especially 

 noticeable on the shoulders, neck, and head. In addition, 

 T. surdaster is a rather smaller animal, the hind foot 

 measuring only 22 mm, in length. 



Lophuromys zena, DoUm. 



S . 1524, 1529, 1546, 1551, 1558, 1560, 1573, 1574, 1576, 

 1586, 1653; ? . 1525, 1547, 1552, 1559, 1563, 1575, 1635, 

 1649. Solai, Mt. Kenia. 



This series of specimens is quite similar to the series from 

 the Aberdare Mountains, the type locality. 



Ann. & Mag. N. Hist. Ser. 8. Vol vii. 35 



