﻿254 
  

  

  CERCOCEBUS 
  

  

  GENUS 
  IV. 
  CERCOCEBUS. 
  THE 
  MANGABEYS. 
  

  

  j 
  2-2^ 
  c 
  1-1^ 
  

   1- 
  2— 
  2» 
  *-" 
  1— 
  1> 
  

  

  P. 
  

  

  2—2 
  

   2^2> 
  

  

  M. 
  

  

  3—3 
  

   3—3 
  

  

  3 
  2 
  - 
  

  

  CERCOCEBUS 
  E. 
  Geoff., 
  Ann. 
  Mus. 
  Hist. 
  Nat. 
  Paris, 
  XIX, 
  1812, 
  p. 
  

   97. 
  Type 
  Cercocebus 
  fuliginosus 
  E. 
  Geoffroy, 
  = 
  Simia 
  

   cethiops 
  Schreber. 
  

  

  Semnocebus 
  (nee 
  Less.), 
  Gray, 
  Cat. 
  Monkeys, 
  Lemurs 
  and 
  Fruit- 
  

   eating 
  Bats, 
  Brit. 
  Mus., 
  1870, 
  p. 
  27. 
  

  

  Lophocebus 
  Palmer, 
  Science, 
  XVII, 
  New 
  Series, 
  1903, 
  p. 
  873. 
  

  

  Body 
  slender 
  ; 
  head 
  oval 
  ; 
  muzzle 
  of 
  moderate 
  length 
  ; 
  limbs 
  long 
  ; 
  

   callosities 
  large; 
  tail 
  long; 
  cheek 
  pouches 
  large; 
  fingers 
  webbed 
  at 
  

   bottom 
  ; 
  great 
  toe 
  united 
  by 
  a 
  short 
  web 
  to 
  the 
  next 
  one 
  ; 
  second 
  and 
  

   third 
  toes 
  united 
  for 
  nearly 
  their 
  entire 
  length, 
  and 
  the 
  fourth 
  is 
  united 
  

   to 
  the 
  third 
  and 
  fifth 
  on 
  either 
  side 
  as 
  far 
  as 
  the 
  middle 
  joints. 
  Pos- 
  

   terior 
  lower 
  molars 
  have 
  a 
  fifth 
  posterior 
  cusp 
  as 
  in 
  Pithecus. 
  Facial 
  

   line 
  straight; 
  premaxillaries 
  not 
  protuberant, 
  on 
  same 
  line 
  as 
  face; 
  

   zygomatic 
  arch 
  high 
  above 
  or 
  below 
  alveolar 
  border 
  of 
  molars. 
  

  

  The 
  Mangabeys 
  constitute 
  a 
  small 
  group 
  of 
  Monkeys 
  that 
  range 
  

   from 
  the 
  west 
  to 
  the 
  east 
  coast 
  of 
  Africa, 
  from 
  Guinea 
  and 
  the 
  Congo 
  

   basin 
  to 
  Uganda 
  and 
  the 
  Tana 
  River. 
  These 
  animals 
  form 
  a 
  kind 
  of 
  

   connecting 
  link 
  between 
  the 
  Macaques 
  of 
  the 
  genus 
  Pithecus 
  and 
  the 
  

   members 
  of 
  the 
  genus 
  Lasiopyga, 
  through 
  the 
  genus 
  Rhinostigma. 
  

   They 
  are 
  lighter 
  in 
  body 
  and 
  more 
  slender 
  in 
  form 
  than 
  the 
  Macaques, 
  

   and 
  have 
  shorter 
  noses, 
  brows 
  less 
  overhanging 
  and 
  larger 
  callosities 
  

   as 
  a 
  rule 
  than 
  the 
  species 
  of 
  Pithecus, 
  also 
  have 
  longer 
  limbs, 
  and 
  like 
  

   them 
  have 
  a 
  fifth 
  cusp 
  to 
  the 
  last 
  lower 
  molars. 
  The 
  stomach 
  is 
  simple 
  

   and 
  the 
  cheek 
  pouches 
  are 
  large, 
  but 
  the 
  laryngeal 
  air 
  sacs 
  are 
  wanting. 
  

  

  A 
  prominent 
  peculiarity 
  is 
  the 
  webbing 
  of 
  the 
  digits, 
  and 
  each 
  

   finger 
  and 
  toe 
  is 
  united 
  to 
  the 
  one 
  next 
  to 
  it, 
  but 
  in 
  a 
  different 
  degree, 
  

   for 
  while 
  the 
  thumb 
  and 
  index 
  finger, 
  and 
  the 
  great 
  toe 
  and 
  its 
  neighbor 
  

   are 
  united 
  by 
  a 
  very 
  short 
  web, 
  the 
  second 
  and 
  third 
  toes 
  are 
  connected 
  

   for 
  nearly 
  their 
  entire 
  length. 
  The 
  tail 
  is 
  very 
  long; 
  and 
  the 
  eyelids 
  

   white 
  ; 
  and 
  the 
  species 
  lack 
  the 
  brilliant 
  colors 
  that 
  are 
  not 
  infrequently 
  

   witnessed 
  in 
  species 
  of 
  Lasiopyga. 
  They 
  are 
  arboreal 
  in 
  their 
  habits, 
  

   and 
  dwell 
  in 
  the 
  dense 
  forests 
  that 
  cover 
  the 
  region 
  in 
  which 
  they 
  are 
  

  

  