1907.] MONKEYS OF THE GENUS CERCOPITHECUS. 735 



yellow, even at the base, speckled grey and black, the black pre- 

 dominating ; no lateral tuft of hair at its base, and no red hair 

 at its base beneath ; grey throughout on the under side. Under 

 side and inside of limbs greyish white, the middle line of the 

 belly sometimes tinged with yellow ; hairs round scrotum in male 

 and on pubic area in female yellowish grey. No coloured hair round 

 the callosities, which are pink. Scrotum in male slate-blue, as in 

 G. cethiops and G. tantalus. 



Log. W. Africa : south of the Congo, Brazzaville [Pousai^gues). 



NvTmerous examples of this species have from time to time been 

 exhibited in the Society's Gardens, but in no case has the exact 

 locality been known. The above-given description has been taken 

 from the skins of an adult male and female. Pousargues says the 

 hair round the scrotum and vulva is of the same colour as tlaat of 

 the belly. This, however, is not the case in the skins of two 

 males and two females that I have examined. He also says that 

 the hairs on the face are black. This also is not so in those 

 that I have seen. It can hardly be claimed as definitely estab- 

 lished that the species here described as G. cynosurus is the same 

 as the one to which Scopoli gave that name. Tradition, however, 

 seems to have fixed the name cynosarus on to the present species, 

 and there appear to be no valid reasons for setting aside the 

 identification. 



Cercopithecus pygerythrus Ouvier. 



Subsp. PYGERYTHRUS Cuv. (Plate XLII. fig. 4. Text-fig. 191, 

 p. 736.) 



Cercopithecus pygerythra F. Cuv. Hist. ISTat. Mamm. iii. pi. 24, 

 1821. 



Gercopitliecus jyygerithrceus Desmarest, Mamm. pt. 2, Suppl. 

 p. 534, 1822. 



Gercopithecus pygerythrus Lesson, Is. Geoff'r. St. H., and of 

 subsequent authors. 



Simia erythropyga Cuvier, Regn. Anim. nouv. ed. p. 92, 1829 ; 

 Fischer, Syn. Mamm., Addenda, p. 336, 1830. 



Gercopithecus pusillus Desmoulins, Diet. Class, vii. p. 568, 

 1825. 



Gercopithecus lalandii Is. Geofir. St. H. Diet. d'Hist. ISTat. iii. 

 p. 305, 1843. 



Face black, clothed with black hairs ; a very distinct white 

 brow-band continuous laterally with the white haii' clothing the 

 anterior portion of the cheeks, so that the face usually appears to 

 be encircled with a continuous ring of white. Whiskers long, 

 more or less concealing the ears, the ends of the hairs greyish and 

 speckled with black, so that there is no sharp line of demarcation 

 in colour between the whiskers and the top of the head. Head, 



Proc. Zool. Soc— 1907, No. XLIX. 49 



