54 Bulletin American Museum of Natural History [Vol. XL VII 



present collection, with not a single intermediate in a joint series of 

 eighty-four specimens, it is evident that their status is that of distinct 

 species. Yet in measurements and proportions and in the coloration of 

 the upperparts (front and sides of head and lateral line excluded) the 

 two forms are practically indistinguishable. In respect to measurements, 

 two series of adults, comprising 13 specimens of niapu and 14 of akka, 

 afford the following data: 



External Measurements 



Total Head and Tail Verte- Hind Foot Ear 



Length Body bras 



F. anerythr us niapu 345 184 161 45.9 17.4 



F. pyrropus akka 345 186 159 46.7 17.5 



Skull Measurements 



Greatest Length Zygomatic Breadth 

 F. anerythrus niapu 47 .4 25 . 2 



F. pyrropus akka 46 . 8 24 . 2 



The measurements and proportions are thus practically identical in 

 the two forms, the averages in external measurements (taken from speci- 

 mens in the flesh by the collectors) varying from to 2 mm., and those of 

 the skulls from 0.6 to 1 mm. 



Funisciurus pyrropus akka de Winton 



Sciurus pyrrhopus Thomas, 1888, Proc. Zool. Soc. London, p. 9. Two specimens. 

 Type locality, Tingasi, Monbuttu, Belgian Congo. 



Sciurus emini be Winton, 1895, Ann. Mag. Nat. Hist., (6) XVI, August, p. 197. 

 Not Sciurus emini Stuhlmann, 1894. 



Funisciurus akka de Winton, 1899, Ann. Mag. Nat. Hist,, (7) IV, December, 

 p. 357. To replace Sciurus emini de Winton, preoccupied. 



Funisciurus akka Thomas, 1915, Ann. Mag. Nat. Hist., (8) XVI, December, 

 p. 473. Medje (4), Poko (7 specimens). 



Represented by 32 specimens, taken at 7 localities, as follows: 



Boyulu, 1 ( & adult), September 22, 1909. 



Avakubi, 1 (cf adult), July 16, 1914. 



Gamangui, 4 (3 c? adult, 1 9 immature), January 28, February 7, 

 18, 1910. 



Medje, 7 (2 cf, 5 9 —4 immature), January 23, March 25, April 1, 4, 

 September 4, 29, 1910, June 24, 1914. 



Niapu, 13 (5 cf , 8 9, all adult), November 12-30, December 27, 

 1913. * 



Akenge, 3 (1 d\ 2 9 ), September 29, October 10, 11, 1913. 



Niangara, 3 (1 cf, 2 9 , all adult), November 9, 10, 1910. 



