﻿374 
  PROCEEDESTGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  they 
  have 
  been 
  confused 
  with 
  each 
  other. 
  The 
  dark 
  extremities 
  and, 
  

   usually, 
  the 
  dark 
  facial 
  band, 
  the 
  coronal 
  tufts, 
  especially 
  in 
  the 
  male, 
  

   always 
  serve 
  to 
  distinguish 
  the 
  "tufted" 
  form 
  from 
  unicolor. 
  Cranial 
  

   characters 
  are, 
  of 
  course, 
  outstandingly 
  diagnostic. 
  

  

  Lonnberg 
  {op. 
  cit.) 
  has 
  given 
  an 
  excellent 
  account 
  of 
  19 
  specunens 
  

   of 
  albifrons 
  he 
  recorded 
  from 
  the 
  middle 
  Amazonian 
  region. 
  Judged 
  

   by 
  his 
  descriptions, 
  these 
  micos 
  show 
  a 
  somewhat 
  wider 
  range 
  of 
  

   variation 
  in 
  color 
  than 
  is 
  given 
  here 
  for 
  the 
  subspecies. 
  It 
  is 
  possible, 
  

   however, 
  that 
  more 
  than 
  one 
  race 
  is 
  involved 
  in 
  view 
  of 
  the 
  wide 
  

   distances 
  and 
  the 
  great 
  rivers 
  separating 
  some 
  of 
  the 
  localities 
  where 
  

   his 
  specimens 
  were 
  taken. 
  Without 
  recognizing 
  it 
  as 
  a 
  purely 
  sexual 
  

   characteristic, 
  Lonnberg 
  noted 
  that 
  in 
  four 
  females 
  the 
  whole 
  of 
  the 
  

   frontal 
  area 
  was 
  of 
  approximately 
  the 
  same 
  color 
  as 
  the 
  cap. 
  He 
  

   attributed 
  this 
  to 
  simple 
  individual 
  variation 
  as 
  other 
  specimens, 
  

   both 
  male 
  and 
  female 
  with 
  pale 
  colored 
  foreheads 
  were 
  taken 
  in 
  the 
  

   same 
  localities. 
  Pusch, 
  however, 
  assigned 
  the 
  " 
  dunkelstirnig" 
  fe- 
  

   males 
  to 
  his 
  "Cebus 
  cuscinus 
  cuscinus." 
  The 
  "heUstirnig" 
  specimens 
  

   he 
  retained 
  as 
  gracilis. 
  He 
  elected 
  to 
  list 
  the 
  earlier 
  name 
  unicolor 
  

   as 
  a 
  synonym 
  of 
  gracilis. 
  

  

  Specimens 
  from 
  the 
  Rio 
  Ucayali 
  region 
  recorded 
  by 
  Thomas 
  (op. 
  

   cit.) 
  as 
  species 
  B, 
  were 
  described 
  as 
  a 
  "paler 
  species 
  with 
  red 
  legs 
  and 
  

   a 
  whitish 
  tail." 
  They 
  were 
  said 
  to 
  be 
  conspecific 
  with 
  those 
  Thomas 
  

   described 
  as 
  Cebus 
  flavescens 
  cuscinus. 
  This 
  establishes 
  the 
  identity 
  

   of 
  these 
  micos 
  as 
  C. 
  albifrons 
  nearest 
  unicolor. 
  It 
  is 
  also 
  probable 
  that 
  

   the 
  series 
  agrees 
  sufficiently 
  with 
  chrysopus 
  to 
  warrant 
  its 
  recognition 
  

   as 
  a 
  valid 
  race. 
  Pusch 
  examined 
  the 
  specimens 
  in 
  question 
  and 
  re- 
  

   ferred 
  aU 
  but 
  the 
  Chicosa 
  female 
  to 
  gracilis. 
  That 
  female 
  was 
  de- 
  

   scribed 
  by 
  Thomas 
  (op. 
  cit.) 
  as 
  differing 
  "from 
  the 
  rest 
  by 
  having 
  a 
  

   som.ewhat 
  tufted 
  head, 
  with 
  less 
  white 
  on 
  the 
  face." 
  Pusch 
  assigned 
  

   it 
  to 
  his 
  "species" 
  cuscinus. 
  In 
  addition 
  to 
  the 
  above 
  series, 
  Thomas 
  

   recorded 
  at 
  the 
  same 
  time 
  true 
  "tufted" 
  cebids 
  from 
  the 
  same 
  local- 
  

   ities. 
  These 
  were 
  identified 
  by 
  him 
  as 
  species 
  A 
  and 
  described 
  as 
  "a 
  

   dark 
  species 
  with 
  black 
  legs 
  and 
  black 
  tails." 
  They 
  were 
  said 
  to 
  

   agree 
  closely 
  with 
  Cebus 
  fatuellus 
  [=apella] 
  peruanus 
  except 
  for 
  the 
  

   reduction 
  or 
  obsolescence 
  of 
  their 
  tufts. 
  True, 
  the 
  coronal 
  tufts 
  of 
  

   C. 
  apella 
  are 
  not 
  always 
  prominent. 
  Sometimes 
  they 
  consist 
  of 
  only 
  

   a 
  few 
  hairs 
  raised 
  in 
  form 
  of 
  lines. 
  This 
  condition 
  together 
  with 
  the 
  

   presence 
  of 
  tufts 
  (of 
  a 
  different 
  character 
  and 
  entirely 
  restricted 
  to 
  

   females) 
  in 
  "untufted" 
  species 
  from 
  the 
  same 
  localities, 
  caused 
  Thomas 
  

   (op. 
  cit.) 
  to 
  remark 
  that 
  "perhaps 
  the 
  tufts 
  wiH 
  prove 
  to 
  be 
  an 
  entirely 
  

   illusory 
  character." 
  Representatives 
  of 
  dark 
  limbed, 
  "tufted" 
  C. 
  

   apella 
  occur 
  throughout 
  most 
  of 
  the 
  range 
  of 
  C. 
  albifrons 
  unicolor. 
  

  

  Specimens 
  examined. 
  — 
  Thirteen. 
  Marimonda, 
  Rio 
  Orinoco, 
  

   Venezuela, 
  1 
  (A.M.N.H.); 
  Solano, 
  Rio 
  Casiquiare, 
  Venezuela, 
  3 
  

   (A.M.N.H.); 
  Yavanari, 
  Rio 
  Negro, 
  Brazil, 
  3 
  (A.M.N.H.); 
  Casas 
  

  

  