Anomalurus and Sciurus/>'om Tropical Africa. 71 



hairs on the flanks darker than those on the body, producing 

 an indistinct dark patch on the edge of the membrane ; general 

 colour of under surface dirty grey; throat strongly suffused 

 with " orange-rufous," passing into pinkish buff on the 

 stomach and hind limbs ; head silvery grey, cheeks and lower 

 jaw silvery white, a white patch on the crown between the 

 ears and a white band running along the shoulders ; under- 

 paid of forearms and sides of stomach dirty white ; outer edge 

 of membrane on upper surface behind forearms covered witli 

 stiff black hairs extending backwards for about 1^ inches ; 

 tail dirty grey. 



Dimensions of the type (measured in skin) : — 



Head and body about 385 mm.; tail 139; hind foot 

 (s. u.) 41. 



Skull : greatest breadth 36 ; length of upper tooth- 

 series 12'5. 



Hob. Abutsclii, River Niger, about 150 miles from the coast. 



Type. B.M. no. 2. 11. 10. 7. Collected Feb. 1902 by 

 A. J. Braham, Esq. 



This subspecies differs very considerably from the type of 

 Anomalurus Beecrofti from Fernando Po described by Fraser 

 both in general colour and skull- measurements. The latter, 

 however, in this group are so variable, even among members 

 of the same species, as to be of little value. As an example 

 two adult specimens, both undoubtedly Anomalurus Beecrofti, 

 differed by as much as 1*5 mm. in the length of the upper 

 tooth-series. In colour A. B. argenteus differs from Anoma- 

 lurus Beecrofti in being of a light silvery grey on its upper 

 surface instead of " yellowish grey." It is also much less 

 suffused with rufous on its under surface. 



Sciurus ritfobrachiatus ruwenzorii, subsp. n. 



Allied to S. Jcenice, Neum.*, but with a certain amount of 

 fulvous on its muzzle and feet and a pure white streak on the 

 under surface. 



General colour above " olivaceous," the hairs brown, 

 speckled with " ochraceous," without the marked rufous 

 suffusion found in S. nyansos. Base of the hairs " slate- 

 grey." Length of the underfur about 15 mm. and of the 

 long hairs 25 mm. Under surface " creamy buff," not 

 sharply defined, gradually passing into the "olivaceous" of 

 the sides. Middle line of under surface with a sharply defined 

 white streak about ^ inch broad extending from the inter- 

 ramia to the inguinal region, its hairs white to their bases. 



* SB. Ges. nat. Fr. Berlin, 1902, p. 176. 



