African small Mammals. 105 



Dimensions of the type (measured in tho fl isli) : — 



Head and body 283 mm. ; tail 283; hind toot 47. 



Skull: greatest lengtli 50; zygomatic breadth 30; length 

 of upper cheek-tooth series 9. 



ILib. R. Ubanghi. Type from the Roman Catliolic Mission 

 situated at 19°3(y E. on the lJI):uighi ; another specimen from 

 Koango, a little higher up the river. 



Type. Old female. li.M. no. 7. 7. 8. 83. Original num- 

 ber 34. Collected 7ih November, 100'), by Capt. Boyd Alex- 

 ander, and presented by the Alexander-Gosling Expedition. 



In this form buffy is present on the feet and not on the tail, 

 the converse of the case in subsp. omensis. The general 

 colour is much darker than in [uteris, and the muddy-coloured 

 belly is also distinctive. 



Para.rerus j icksoni capitis, subsp. n. 



Similar to true jacksoni, but colour paler and more greyisii 

 green on the body, and on the extremities ochraceous replaced 

 by buffy, and buff by whitish. General colour above pale 

 greyish olivaceous, indistinct light flank-lines generally 

 perceptible. Under surface soiled whitish or creamy white, 

 the corresponding part in true jacksoni cream-buff or buff. 

 Upper surface of hands and feet yellowish buff instead of 

 ocliraceous buff. Tail with the terminal rings, when un- 

 bleached, similarlv yellowish, as compared with ochraceous, 

 buff 



Skull as in true Jacksoni. 



Dimensions of the type (measured in flesh) : — 

 Head and body 180 mm. ; tail (broken, in another specimen 

 of similar size 187) ; hind foot 41 ; ear 21. 



Skull: greatest length 43; condylo-basal length 40; 

 uj)per tooth-row exclusive of/)' 7. 



Hab. Nairobi Forest, British East Africa. Alt. 5600'. 

 Tt/pe. Old female. B.M. no. 0. 2. 1. 11. Collected 19th 

 July, 1899, by Prof. II. J. Mackinder, Fourteen specimens 

 examined. 



The considerable number of squirrels hitherto referred to 

 P. jacksoni proves t3 be readily divisible into two sets 

 according to the intensity of the buffy or ochraceous suffused 

 through their general colour, and on their under surfaces, feet, 

 and tail. Specimens from Munisu and Smara, to the north 

 and eastward of Kenia, agree precisely with the type in these 

 respects, while the Nairobi series are all of the paler and more 

 yellowish character above described. 



It is to be noticed that in this animal, as in P. aruscensis^ 

 Ann. (Jfc Maff. N. Ilist. Ser. 8. Vol. iv. 8 



