﻿CERCOCEBUS 
  259 
  

  

  French 
  Congo, 
  and 
  in 
  the 
  last 
  named 
  territory, 
  at 
  the 
  junction 
  of 
  the 
  

   Oubangui 
  and 
  Congo 
  rivers, 
  C. 
  agilis 
  is 
  found. 
  In 
  Sierra 
  Leone 
  and 
  

   Liberia, 
  C. 
  ^ethiops 
  is 
  met 
  with; 
  and 
  lastly 
  on 
  the 
  Gold 
  Coast, 
  range 
  

   unknown, 
  C. 
  lunulatus 
  was 
  obtained. 
  It 
  will 
  be 
  seen 
  from 
  the 
  above, 
  

   that 
  the 
  habitats 
  of 
  some 
  of 
  the 
  species 
  are 
  either 
  guessed 
  at 
  or 
  

   unknown, 
  and 
  much 
  remains 
  to 
  be 
  learned 
  of 
  the 
  dispersion 
  of 
  the 
  

   members 
  of 
  this 
  genus. 
  

  

  KEY 
  TO 
  THE 
  SPECIES. 
  

  

  A. 
  No 
  crest 
  on 
  head. 
  

  

  a. 
  Color 
  of 
  hairs 
  on 
  body 
  uniform. 
  

  

  a.' 
  Top 
  of 
  head 
  reddish 
  chestnut 
  C. 
  torquatus. 
  

  

  b! 
  Top 
  of 
  head 
  speckled 
  yellow 
  and 
  blackish 
  

  

  brown 
  C. 
  cethiops. 
  

  

  c! 
  Top 
  of 
  head 
  with 
  a 
  white 
  patch 
  C. 
  lunulatus. 
  

  

  b. 
  Color 
  on 
  head, 
  limbs 
  and 
  fore 
  part 
  of 
  body 
  

  

  speckled. 
  

  

  a! 
  No 
  brow 
  fringe 
  C. 
  chrysogaster. 
  

  

  b! 
  With 
  brow 
  fringe. 
  

  

  a." 
  Hairs 
  on 
  sides 
  of 
  head 
  not 
  falling 
  over 
  

   ears. 
  

   a!" 
  With 
  yellow 
  on 
  flanks 
  and 
  under 
  

  

  parts 
  C. 
  agilis. 
  

  

  b!" 
  No 
  yellow 
  on 
  flanks 
  and 
  under 
  

  

  parts 
  C. 
  hagenbecki. 
  

  

  b." 
  Hairs 
  on 
  sides 
  of 
  head 
  falling 
  over 
  

  

  ears 
  C. 
  galeritus. 
  

  

  B. 
  Crest, 
  or 
  tuft 
  on 
  head. 
  

   a. 
  Face 
  black. 
  

  

  a.' 
  Whiskers 
  short, 
  superciliary 
  fringe 
  present. 
  

  

  a." 
  Gray 
  tinge 
  on 
  mantle 
  C. 
  albigena. 
  

  

  b." 
  No 
  gray 
  tinge 
  on 
  mantle 
  C. 
  a. 
  johnstoni. 
  

  

  c." 
  Mantle 
  light 
  brownish 
  gray 
  C. 
  a. 
  zenkeri. 
  

  

  b! 
  Whiskers 
  long 
  ; 
  no 
  superciliary 
  fringe 
  C. 
  aterrimus. 
  

  

  Subgenus 
  Cercocebus. 
  

  

  No 
  crest 
  ; 
  hairs 
  short 
  ; 
  zygomatic 
  arch 
  high 
  above 
  alveolar 
  border 
  

   of 
  molars. 
  

  

  