7iew Species of Manyabey. 209 



beliii)il the inaininto, Tail entirely greyish white. Outside 

 of upper arm greyish white tinted with brown, of forearm 

 bh\ekisli iron-grey between the elbow and wrist ; inner side of 

 forearm infiiscate. Hands yellowish grey above, the j)alm3 

 and nails pinky flesh-coloured. Outer and inner side of legs 

 and upper side of feet greyish white. ISoles of feet and Jiails 

 pinky tlesh-colourod. Coat thick, almost woolly, the long 

 hairs glistening. 



Head and body about 16 English inches ( = 400 mm.) ; 

 tail about 20 inches ( = 500 mm.). 



Locaiity. Upper Congo, exact area unknown. 



The above-given diagnosis is taken from a living female 

 specimen, still with milk-dentition, brought to London with 

 an example of Wolf's guenon [Gtrcopithecus Wulfi) and of 

 Brazza^s guenon (C. ne(jlectu!<). 1 am indebted to J\Ir. J. D. 

 Hamlyn, the well-known importer of wild animals, for the 

 opportunity to describe it, and I have great pleasure in 

 associating the new species of which it is the type with his 

 name. 



With its {)()intrd iiead-erest and long whisk(n's this species 

 falls into the category typified by Cercocebus albigena^ ^jrray, 

 subsp. Rothschildi , Lydd., and C. comjicus, 8clater. From 

 the former it may be distinguished by its yellowish or 

 greyish-while coloration. To the latter it has many points of 

 resemblance, notably the pink fleshy hue of the face, hands, 

 and feet, the white throat, cheeks, and tail. But whereas in 

 C. congicus the arms, the legs down to the knees, and the 

 entire body with exception of the chest are black, in 

 C JJamlyni the hind-quarters are entirely whitish grey, the 

 arms are merely ashy grey (especially between the elbow and 

 wrist), and the entire body is whitish gi'ey except for tlie 

 ashy tint of the back and chest. 



It is regrettable that only one specimen of each of these 

 two species, namely C. congicus aud 6'. Hamlgni^ has been 

 seen, and also that no exact locality is known for either. 

 That the difference between the two specimens is not sexual 

 is proved by the feminine gender of both ; that it is not 

 assignable to age is rendered probable by the approximate 

 similarity in coloration betwei^n young and adult examples of 

 other species of Cercvctbus, namely of C. fuliginosus, luau- 

 latuSf a-thiopiciis,chrijsogaster, tiageahecki, and albigena. 



It must be freely conceded that tiie pinkiness of tiie face, 

 of the soles of the feet, palms of the hands, and especially, 

 perhaps, of the nails, suggests partial albinistic variation both 

 in congicus and Hamlyni. If this were so, the two might be 

 dismissed as piebald sports of the form of 6\ albigena described 



