378 Messrs. 0. Thomas and R. C. "Wrougliton on 



general shape, much shorter than in F. Bbhmi. Upper 

 incisors \iv\ pale yellow in front. 



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



Head and body 104 mm.; tail 126; hind foot 25; ear 12. 



Skull: greatest length 31'0; basilar length 24-2; greatest 

 breadth 19"4; interorbital breadtli 9'6 ; palatilar length 12'2 ; 

 length of upper tooth series (exclusive of the minute jo^) 5'1. 



Eah. Ponthierville, above Stanley Falls, Upper Congo. 

 Alt. 2000^ 



7]y/)e. Adult female. Original number 351. Collected 21st 

 February, 1907, by Douglas Carruthers. Two specimens. 



This beautiful little squirrel is no doubt most nearly allied 

 to F. Alexandri of the Welle, but in colour it almost exactly 

 mimics the much larger F. Bohmi Emini which occurs 

 with it. 



Tatera lacustris, sp. n, 



A Tatera of the Emini group, paler coloured than that 

 Bpecies and with smaller bullae. 



Size about the same as Emini; fur long and fine, length 

 on the back 15 mm., against 10 mm. in Emini; general 

 colour above a rusty buff, pure on the flanks, much grizzled 

 with black on the back, below pure white. Basal three 

 fourths of dorsal hairs a silvery grey, tips buff, but in a 

 certain percentage of the hairs of the back the terminal 

 fourth is black. Cheeks^ a patch above the eye and one 

 behind the ears, and the whole of the under surface and inner 

 sides of the limbs pure white. Tail above coloured like the 

 back, below a silvery bufi"; hairs of terminal third length- 

 ened to form a tuft, which is markedly darker than the rest 

 of the body. 



Skull almost as in Emini, but the nasals a shade longer 

 and narrower, giving the skull a lighter appearance, and the 

 interparietal more horizontal, making the skull slightly 

 longer. The bullse appreciably smaller than in Emini. 



The following are measurements of some specimens : — 



No. 14, 



d,type. 3 $. 6 $. 7 $. Emini. 



Head and body 118 123 119 94 140 



Tail 153 150 153 138 155 



Hind foot 30 30 29 29 29 



Ear 19 19 19 19 



Greatest length of skull . 37 35 36 34 35 



Basilar length 27 27 27 25 27 



Brain-case, width 15 15 15 14 14 



Interorbital width 6-5 6 6-5 6-1 6 



Nasals 15 14 .. 14 13 



Upper molar series .... 55 5o 5-3 5-3 5-2 



Bull* 9 9 91 9 10-4 



