﻿CERCOCEBUS 
  255 
  

  

  found. 
  One 
  species, 
  however, 
  has 
  been 
  observed 
  to 
  descend 
  to 
  the 
  

   ground 
  to 
  seek 
  food. 
  

  

  Some 
  species 
  have 
  a 
  very 
  sombre 
  coat, 
  and 
  their 
  young 
  are 
  black, 
  

   and 
  the 
  appearance 
  of 
  the 
  animals 
  in 
  their 
  progress 
  from 
  the 
  youthful 
  

   to 
  the 
  adult 
  pelage 
  has 
  produced 
  considerable 
  confusion 
  among 
  writers 
  

   when 
  discussing 
  these 
  Monkeys, 
  ending 
  with 
  the 
  recognition 
  of 
  a 
  

   number 
  of 
  invalid 
  species, 
  and 
  resultant 
  errors. 
  The 
  disposition 
  of 
  

   the 
  Mangabeys 
  appears 
  to 
  be 
  gentle; 
  their 
  activity 
  is 
  never 
  ceasing, 
  

   and 
  they 
  are 
  in 
  the 
  habit 
  of 
  "making 
  faces," 
  or 
  grinning 
  at 
  the 
  observer, 
  

   exhibiting 
  at 
  the 
  same 
  time 
  a 
  liberal 
  display 
  of 
  teeth. 
  The 
  species 
  are 
  

   easily 
  arranged 
  into 
  two 
  groups, 
  characterized 
  by 
  the 
  presence 
  or 
  

   absence 
  of 
  a 
  crest 
  on 
  the 
  head. 
  The 
  non-crested 
  species 
  are 
  possessed 
  

   of 
  brighter 
  colors, 
  or 
  the 
  strong 
  contrasts 
  produced 
  by 
  a 
  distribution 
  

   of 
  black 
  and 
  white 
  ; 
  while 
  those 
  with 
  crests 
  have 
  a 
  more 
  subdued 
  dress 
  

   in 
  which 
  grays 
  and 
  browns 
  are 
  conspicuous, 
  but 
  the 
  bright 
  colors, 
  

   although 
  altogether 
  wanting 
  save 
  in 
  some 
  instances, 
  are 
  more 
  con- 
  

   spicuous 
  when 
  existing, 
  on 
  the 
  under 
  parts 
  of 
  the 
  body. 
  

  

  LITERATURE 
  OF 
  THE 
  SPECIES 
  AND 
  SUBSPECIES. 
  

  

  1775. 
  Schreber, 
  Die 
  Sdugthiere. 
  

  

  Cercocebus 
  ^ethiops 
  is 
  here 
  first 
  described 
  as 
  Simla 
  cethiops 
  

  

  (nee 
  Linn.). 
  

   1792. 
  Kerr, 
  Animal 
  Kingdom. 
  Mammalia. 
  

  

  Cercocebus 
  torquatus 
  first 
  described 
  as 
  Simia 
  cethiops 
  tor- 
  

  

  quatus. 
  

   1799. 
  Audebert, 
  Histoire 
  Naturelle 
  des 
  Singes 
  et 
  des 
  Makis. 
  

  

  Simia 
  cethiops 
  Schreb., 
  and 
  5. 
  cethiops 
  (nee 
  Linn.), 
  var 
  A. 
  the 
  

  

  latter 
  afterwards 
  called 
  cethiopicus 
  by 
  F. 
  Cuv., 
  1821 
  = 
  C. 
  

  

  cethiops 
  (Schreb.), 
  and 
  C. 
  atys, 
  albino, 
  undeterminable, 
  are 
  

  

  given 
  in 
  this 
  book. 
  

   1812. 
  E. 
  Geoffroy 
  St. 
  Hilaire, 
  in 
  Annales 
  du 
  Museum 
  d'Histoire 
  

   * 
  Naturelle, 
  Paris. 
  

  

  Cercocebus 
  cethiops 
  Schreb., 
  redescribed 
  as 
  C. 
  fuliginosus 
  ; 
  

  

  the 
  remaining 
  species 
  under 
  Cercocebus 
  given 
  by 
  this 
  Author, 
  

  

  belong 
  to 
  other 
  genera. 
  C. 
  atys, 
  albino, 
  possibly 
  C. 
  ^thiops 
  

  

  (Schreb.), 
  but 
  really 
  undeterminable. 
  

   1820. 
  Kuhl, 
  Beitrdge 
  zur 
  Zoologie 
  und 
  vergleischenden 
  Anatomie. 
  

  

  The 
  species 
  of 
  Cercocebus 
  recorded 
  by 
  this 
  Author 
  are 
  placed 
  

  

  in 
  the 
  genus 
  Cercopithecus, 
  (Lasiopyga), 
  which 
  includes 
  species 
  

  

  