Description
English:
« Cercocebus hagenbecki » = Cercocebus agilis hagenbecki (Top)
« Semnocebus albigena rothschildi » = Lophocebus aterrimus (Black crested mangabey) (Bottom)
Français:
« Cercocebus hagenbecki » = Cercocebus agilis hagenbecki
« Semnocebus albigena rothschildi » = Lophocebus aterrimus
Date 1901
Source Novitates Zoologicae, vol. 8 http://archive.org/stream/novitateszoologi08lond#page/88/mode/2up
Author Joseph Smit (1836–1929) https://en.wikipedia.org/wiki/Joseph_Smit
Source: https://commons.wikimedia.org/wiki/File:Cercocebus-SemnocebusSmit.jpg

The agile mangabey (Cercocebus agilis) is an Old World monkey of the white-eyelid mangabey group found in swampy forests of Central Africa in Equatorial Guinea, Cameroon, Gabon, Central African Republic, Republic of Congo, and DR Congo. Until 1978, it was considered a subspecies of the Tana River mangabey (C. galeritus). More recently, the golden-bellied mangabey (C. chrysogaster) has been considered a separate species instead of a subspecies of the agile mangabey. Order: Primates, Family: Cercopithecidae.

The black crested mangabey (Lophocebus aterrimus) is a species of primate in the family Cercopithecidae. It is found in Angola and Democratic Republic of the Congo. Its natural habitat is subtropical or tropical dry forests. It is threatened by habitat loss. Order: Primates, Family: Cercopithecidae.