1907.] MONKEYS OF THE GENUS CERCOPITHECUS. 713 



Three adult specimens from the Benito River taken at sea-level, 

 20 miles from the coast, gave the following measurements in the 

 flesh :— 



(S . Head and body 525 mm., tail 750 mm. 



d. „ „ 547 „ „ 870 „ 



$. „ „ 440 „ „ 785 „ 



According to Bates the Fang name is " Sliunie." 

 Judging from some skins, without definite locality, in the col- 

 lection of the Zoological Society, the under side and inner surface 

 of the limbs are much whiter, in some cases, indeed, almost 

 untinged with yellow in immature forms. 



Subsp. NiGRiPES Du Chaillu. 



Cercoplthecas myripes Du Chaillu, P. Bost. N. H. Soc. vii. 

 p. 360, 1860. 



Log. Gaboon {Da (Jhailla, 61.7.29.16 in B.M.). 



The single skin of this foi-m that the British Museum possesses 

 is only distinguishable from typical rejiresentatives of C. grayi, as 

 exemplified by the specimens from the Benito River, by the 

 greater amount of black over the lumbo-saciul area. In this par- 

 ticulai- C. nigripes is nearly intermediate between the typical 

 C. grayi and C pogonias ; but in the latter the black shield is 

 sharply defined along its edges and relatively much longer as 

 compared with its width. 



Cercopitiiecus pogonias Bennett. 



Oercopithecus pogonias Bennett, P. Z. 8. 1833, p. 67 ; and of 

 most subsequent authors. 



Allied to C. grayi. Xo lateral white or yellowish-white stripe 

 on the head above the temple- stripe. Head, neck, shoulders, fore 

 legs, and sides of body speckled yellow and black, with more grey 

 in the hair on the sides of the body than on the slioulders. The 

 entire dorsal area behind the shoulders covered with a broad band 

 of jet-black hair, imperceptibly blending with the speckled hair of 

 the shoulders in front, but very sharply deiined from the greyish - 

 speckled hue of the sides of the body. Outer side of thighs 

 greyish, tinged with yellowish red. The entire under surface and 

 the inside of the limbs are rusty red. The basal half of the tail 

 is red beneath, black above, and the terminal half is wholly blatck. 



Loc. Exact locality unknown. Said to be Fernando Po. 



The above-given description is taken from two flat native- 

 pi-epared skins in the British Musei\m. They appear to agree 

 with the example described by Bennett, a very young thick-coated 

 specimen mounted in the British Museum, except in the definition 

 of the dorsal black ai'ea. In Bennett's specimen the shield is 

 smaller and only sharply defined on the sacral area. 



Pousargues records a specimen referable either to typical 

 C. pogonias or to C. grayi nigripes from Oette Gama. 



