﻿108 
  CEBUS 
  

  

  matic 
  width, 
  72.3 
  ; 
  median 
  length 
  of 
  nasals, 
  28.3 
  ; 
  palatal 
  length, 
  32.3 
  ; 
  

   length 
  of 
  upper 
  molar 
  series, 
  23.9 
  ; 
  length 
  of 
  mandible, 
  67 
  ; 
  length 
  of 
  

   lower 
  molar 
  series, 
  27.5. 
  

  

  The 
  type 
  of 
  this 
  species 
  was 
  described 
  from 
  Paraguay. 
  Not 
  

   having 
  seen 
  an 
  example 
  from 
  that 
  district 
  of 
  Brazil, 
  the 
  above 
  descrip- 
  

   tion 
  was 
  taken 
  from 
  an 
  individual 
  obtained 
  at 
  Serra 
  da 
  Chapada, 
  

   Matto 
  Grosso, 
  to 
  the 
  north 
  of 
  Paraguay, 
  and 
  on 
  the 
  west 
  of 
  the 
  River 
  

   Parana, 
  and 
  which 
  as 
  far 
  as 
  Rengger's 
  rather 
  insufficient 
  description 
  

   enables 
  us 
  to 
  ascertain, 
  is 
  the 
  same 
  as 
  the 
  Paraguay 
  specimens. 
  It 
  is 
  a 
  

   very 
  variable 
  species 
  and 
  the 
  individual 
  described 
  represents 
  as 
  

   nearly 
  as 
  possible 
  its 
  general 
  appearance. 
  But 
  there 
  are 
  darker 
  and 
  

   paler 
  styles, 
  which, 
  while 
  having' 
  a 
  general 
  resemblance, 
  differ 
  con- 
  

   siderably 
  in 
  their 
  depth 
  of 
  coloring. 
  Thus, 
  in 
  the 
  pale 
  style 
  the 
  cream 
  

   buff 
  predominates 
  over 
  all 
  the 
  body 
  and 
  upper 
  part 
  of 
  limbs, 
  the 
  

   blackish 
  hues 
  not 
  extending 
  above 
  the 
  elbows 
  or 
  knees, 
  while 
  the 
  

   darker 
  form 
  has 
  the 
  entire 
  upper 
  parts 
  sepia 
  with 
  the 
  line 
  in 
  front 
  of 
  

   ears 
  beneath 
  chin 
  darker 
  and 
  more 
  conspicuous. 
  Ten 
  specimens 
  in 
  

   the 
  British 
  Museum 
  from 
  Chapada 
  exhibit 
  these 
  different 
  and 
  striking 
  

   variations, 
  the 
  examples 
  grading 
  from 
  nearly 
  white 
  to 
  sepia. 
  Young 
  

   animals 
  are 
  much 
  paler 
  than 
  the 
  adults. 
  

  

  The 
  type 
  of 
  C. 
  elegans 
  Geoff 
  roy, 
  in 
  the 
  Paris 
  Museum, 
  may 
  also 
  

   be 
  assigned 
  to 
  this 
  species. 
  It 
  is 
  not 
  so 
  dark 
  on 
  the 
  back, 
  and 
  the 
  

   under 
  parts 
  are 
  paler, 
  but 
  when 
  we 
  consider 
  that 
  the 
  specimen 
  has 
  been 
  

   in 
  the 
  Museum 
  since 
  1812 
  exposed 
  to 
  the 
  light 
  for 
  nearly 
  a 
  century, 
  

   no 
  surprise 
  should 
  be 
  felt 
  if 
  it 
  had 
  in 
  places 
  become 
  greatly 
  faded. 
  The 
  

   tail 
  is 
  still 
  brownish 
  black 
  and 
  dark 
  brown 
  at 
  tip 
  and 
  the 
  digits 
  are 
  

   gray. 
  

  

  Cebus 
  azaile 
  pallidus 
  Gray. 
  

  

  Cebus 
  pallidus 
  Gray, 
  Proc. 
  Zool. 
  Soc. 
  Lond., 
  1865, 
  p. 
  826 
  ; 
  Id. 
  Cat. 
  

   Monkeys, 
  Lemurs 
  and 
  Fruit-eating 
  Bats, 
  Brit. 
  Mus., 
  1870, 
  

   p. 
  49. 
  

  

  Type 
  locality. 
  Bolivia. 
  Type 
  in 
  British 
  Museum. 
  

  

  Geogr. 
  Distr. 
  Santa 
  Anna, 
  Peru, 
  into 
  Bolivia. 
  Complete 
  range 
  

   unknown. 
  

  

  Color. 
  Forehead 
  and 
  temples 
  yellowish 
  white, 
  extending 
  in 
  a 
  

   narrow 
  line 
  on 
  each 
  side 
  into 
  the 
  black 
  cap, 
  not 
  meeting 
  but 
  nearly 
  

   forming 
  two 
  black 
  patches 
  on 
  the 
  head 
  ; 
  top 
  of 
  head 
  and 
  nape 
  black 
  ; 
  

   narrow 
  brown 
  line 
  down 
  sides 
  of 
  head 
  in 
  front 
  of 
  ears 
  to 
  chin 
  ; 
  dorsal 
  

   region 
  between 
  shoulders 
  dark 
  bistre, 
  grading 
  into 
  Prout's 
  brown 
  on 
  

  

  

  