﻿MAMMALS 
  OF 
  NORTHERN 
  COLOMBIA 
  — 
  ^HERSHKOVITZ 
  373 
  

  

  Cap 
  Snuff 
  Brown 
  to 
  Bister, 
  frontal 
  region 
  buffy 
  to 
  ochraceous; 
  back 
  

   Ochraceous-Buff 
  to 
  Ochraceous-Orange 
  or 
  Tawny 
  more 
  or 
  less 
  lined 
  

   with 
  dark 
  brown 
  ; 
  sides 
  with 
  less 
  brown, 
  lateral 
  fringe 
  Ochraceous-Buff 
  

   to 
  Ochraceous-Orange 
  ; 
  forearm 
  and 
  foreleg 
  Ochraceous-Buff 
  to 
  Tawny 
  

   contrasting 
  with 
  dark 
  lining 
  of 
  back; 
  hairs 
  of 
  belly 
  Ochraceous-Buff 
  to 
  

   Ochraceous-Orange, 
  of 
  chest 
  like 
  belly 
  or 
  white; 
  whitish 
  patch 
  obsolete 
  

   on 
  front 
  of 
  shoulder. 
  

  

  Measurements. 
  — 
  Those 
  of 
  an 
  adult 
  male 
  and 
  female 
  from 
  Solano, 
  

   Rio 
  Casiquiare, 
  followed 
  by 
  those 
  of 
  two 
  adult 
  females 
  from 
  Rio 
  Negro 
  

   Yavanari 
  and 
  Casas 
  Pereira 
  Igarape): 
  Head 
  and 
  body, 
  375, 
  375; 
  370, 
  

   365; 
  tail, 
  425, 
  410; 
  420, 
  460; 
  hind 
  foot, 
  124, 
  113; 
  115, 
  115; 
  greatest 
  

   length 
  of 
  skuU, 
  94.6, 
  91.8; 
  92.1, 
  91.6; 
  condylobasal 
  length, 
  71.0, 
  67.3; 
  

   68.4, 
  69.3; 
  zygomatic 
  breadth, 
  57.3, 
  58.6; 
  57.6, 
  57.8; 
  width 
  of 
  

   brain 
  case, 
  53.6, 
  51.2; 
  51.7, 
  51.0; 
  length 
  of 
  brain 
  case, 
  73.7, 
  74.5; 
  72.7, 
  

   70.7; 
  orbital 
  breadth, 
  49.7, 
  51.5; 
  50.3, 
  50.7; 
  greatest 
  width 
  across 
  maxil- 
  

   lary 
  tooth 
  rows, 
  28.6, 
  28.5; 
  29.1, 
  27.8; 
  length, 
  upper 
  canine 
  to 
  M^, 
  27.3, 
  

   26.3; 
  26.3, 
  26.0; 
  length, 
  lower 
  canine 
  to 
  M3, 
  30.5, 
  29.2; 
  28.9, 
  27.9; 
  

   mandibular 
  depth 
  at 
  condyle, 
  25.2, 
  25.6; 
  24.8, 
  29.0 
  mm. 
  

  

  Remarks. 
  — 
  The 
  above 
  characterization 
  is 
  based 
  on 
  original 
  descrip- 
  

   tions 
  and 
  colored 
  plates 
  of 
  unicolor 
  and 
  gracilis, 
  and 
  eight 
  specimens 
  

   recorded 
  by 
  Tate 
  {op. 
  cit.) 
  as 
  C. 
  albifrons. 
  The 
  monkey 
  figured 
  by 
  

   Spix 
  as 
  gracilis 
  is 
  a 
  female. 
  The 
  type 
  of 
  unicolor 
  is 
  an 
  old 
  adult 
  male. 
  

   It 
  was 
  said 
  to 
  differ 
  from 
  gracilis 
  by 
  its 
  larger 
  head, 
  generally 
  larger 
  

   proportions 
  and 
  by 
  the 
  short, 
  stiff 
  gray-banded 
  hairs 
  of 
  limbs 
  and 
  

   tail. 
  These 
  are 
  differences 
  of 
  age 
  and 
  sex. 
  The 
  described 
  gray 
  

   ticking 
  is 
  probably 
  the 
  hoar-frosted 
  condition 
  characteristic 
  of 
  many 
  

   males. 
  This 
  character 
  is 
  not 
  evident, 
  however, 
  in 
  the 
  colored 
  plate. 
  

   Wagner 
  (1833, 
  p. 
  991) 
  in 
  critically 
  reviewing 
  the 
  Primates 
  described 
  

   by 
  Spix, 
  indicated 
  that 
  the 
  two 
  extant 
  specimens 
  of 
  gracilis 
  are 
  

   merely 
  immature 
  representatives 
  of 
  unicolor. 
  The 
  types 
  of 
  both 
  

   unicolor 
  and 
  gracilis 
  are 
  from 
  Teffe. 
  Available 
  specimens, 
  from 
  four 
  

   locahties 
  along 
  the 
  Rio 
  Negro 
  and 
  the 
  Casiquiare, 
  show 
  sUght 
  local 
  

   differences. 
  Specimens 
  from 
  Yavanari 
  are 
  darkest, 
  especially 
  on 
  

   outer 
  side 
  of 
  thigh. 
  However, 
  this 
  may 
  be 
  a 
  dark 
  color 
  phase 
  as 
  

   contrasted 
  with 
  the 
  brightly 
  colored 
  individual 
  from 
  Casas 
  Pereira. 
  

   Remaining 
  specimens, 
  from 
  the 
  Casiquiare, 
  are 
  intermediate 
  in 
  

   coloration. 
  The 
  original 
  colored 
  figures 
  of 
  unicolor 
  and 
  gracilis 
  

   though 
  not 
  identical 
  with 
  any 
  present 
  specimens, 
  fit 
  very 
  well 
  into 
  

   the 
  series 
  as 
  a 
  whole. 
  

  

  There 
  is 
  as 
  yet 
  far 
  too 
  little 
  material 
  for 
  a 
  satisfactory 
  determina- 
  

   tion 
  of 
  the 
  kind 
  of 
  variation 
  these 
  brightly 
  colored 
  monkeys 
  undergo 
  

   within 
  the 
  vast 
  territory 
  assigned 
  to 
  the 
  range 
  of 
  unicolor. 
  Collec- 
  

   tively, 
  they 
  are 
  readily 
  distinguished 
  from 
  all 
  other 
  races 
  of 
  albifrons. 
  

   There 
  is 
  a 
  superficial 
  resemblance 
  between 
  unicolor 
  and 
  erythristic 
  

   representatives 
  of 
  "tufted" 
  cebids 
  from 
  eastern 
  Brazil 
  and 
  sometimes 
  

  

  