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  CERCOCEBUS 
  

  

  1900. 
  Lydekker, 
  in 
  Novitates 
  Zoologies. 
  

  

  Cercocebus 
  chrysogaster 
  ; 
  C. 
  hagenbecki; 
  C. 
  albigena 
  John- 
  

   stoni, 
  first 
  described; 
  and 
  C. 
  aterrimus 
  redescribed 
  as 
  C. 
  a. 
  

   rothschildi. 
  

  

  1906. 
  Pocock, 
  in 
  Annals 
  and 
  Magazine 
  of 
  Natural 
  History. 
  

  

  Cercocebus 
  aterrimus 
  redescribed 
  as 
  C. 
  hamlyni, 
  and 
  Cer- 
  

   cocebus 
  a. 
  johnstoni 
  redescribed 
  as 
  C. 
  jamrachi; 
  and 
  in 
  a 
  sub- 
  

   sequent 
  paper 
  he 
  reviews 
  the 
  species 
  of 
  the 
  genus, 
  recognizing 
  

   ten 
  with 
  three 
  doubtful. 
  They 
  are: 
  C. 
  fuliginosus 
  = 
  C. 
  

   ^ethiops 
  (Schreb.) 
  ; 
  C. 
  lunulatus; 
  C. 
  cethiopicus 
  (Cuv.), 
  = 
  

   C. 
  torquatus 
  (Kerr) 
  ; 
  C. 
  chrysogaster; 
  C. 
  hagenbecki; 
  C. 
  

   agilis 
  ; 
  C. 
  galeritus 
  ; 
  C. 
  albigena, 
  with 
  aterrimus 
  rothschildi, 
  

   and 
  a. 
  johnstoni, 
  somewhat 
  doubtful. 
  C. 
  congicus 
  and 
  C. 
  

   hamlyni 
  both 
  = 
  C. 
  aterrimus. 
  

  

  1910. 
  E. 
  Schwarz, 
  in 
  Annals 
  and 
  Magazine 
  of 
  Natural 
  History. 
  

  

  A 
  paper 
  on 
  C. 
  aterrimus 
  and 
  C. 
  albigena 
  and 
  their 
  synonyms. 
  

   The 
  Author 
  discusses 
  the 
  specific 
  values 
  of 
  C. 
  congicus, 
  C. 
  

   hamlyni, 
  and 
  C. 
  rothschildi, 
  and 
  decides 
  that 
  they 
  are 
  merely 
  

   albinistic 
  individuals 
  of 
  C. 
  aterrimus 
  Oudemans, 
  as 
  regards 
  

   the 
  first 
  two, 
  and 
  the 
  third 
  is 
  not 
  to 
  be 
  distinguished 
  from 
  the 
  

   same 
  species. 
  Also 
  C. 
  jamrachi 
  is 
  an 
  albino 
  of 
  C. 
  a. 
  johnstoni. 
  

   G. 
  albigena 
  and 
  C. 
  aterrimus 
  are 
  compared 
  and 
  their 
  

   specific 
  differences 
  shown. 
  

  

  1911. 
  Schwarz, 
  in 
  Sitzungsberichte 
  der 
  Gesellschaft 
  Naturforschender 
  

   Freunde, 
  Berlin. 
  

  

  Cercocebus 
  albigena 
  zenkeri 
  first 
  described. 
  

  

  GEOGRAPHICAL 
  DISTRIBUTION 
  OF 
  THE 
  SPECIES 
  AND 
  SUBSPECIES. 
  

  

  The 
  species 
  of 
  the 
  genus 
  Cercocebus 
  are 
  African 
  and 
  so 
  far 
  as 
  

   is 
  known 
  are 
  about 
  equally 
  divided 
  between 
  the 
  eastern 
  and 
  western 
  

   parts 
  of 
  the 
  continent. 
  In 
  East 
  Africa 
  the 
  most 
  northerly 
  species 
  

   is 
  C. 
  galeritus, 
  which 
  is 
  found 
  in 
  the 
  vicinity 
  of 
  the 
  Tana 
  River, 
  its 
  

   range, 
  like 
  those 
  of 
  many 
  of 
  its 
  relatives 
  not 
  yet 
  determined. 
  From 
  

   Uganda 
  and 
  Lake 
  Mweru 
  to 
  the 
  Upper 
  Congo 
  C. 
  a. 
  johnstoni 
  is 
  met 
  

   with. 
  In 
  various 
  places 
  along 
  the 
  Congo, 
  the 
  exact 
  localities 
  yet 
  to 
  

   be 
  ascertained, 
  the 
  following 
  species 
  have 
  been 
  procured. 
  C. 
  chryso- 
  

   gaster 
  on 
  the 
  "Congo"; 
  C. 
  hagenbecki, 
  locality 
  given 
  as 
  "Upper 
  

   Congo" 
  ; 
  C. 
  albigena 
  "Lower 
  Congo" 
  ; 
  C. 
  a. 
  zenkeri, 
  at 
  Bifindi, 
  

   Cameroon 
  ; 
  and 
  C. 
  aterrimus, 
  "Central 
  Congo 
  Basin." 
  In 
  Nigeria 
  C. 
  

   torquatus 
  is 
  met 
  with 
  ranging 
  south 
  and 
  east 
  through 
  Cameroon 
  into 
  

  

  