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  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  es 
  

  

  The 
  sexually 
  restricted 
  peculiarity 
  of 
  the 
  dark 
  brown 
  frontal 
  region, 
  

   usually 
  associated 
  with 
  a 
  frontal 
  diadem 
  or 
  tuft, 
  was 
  regarded 
  as 
  a 
  

   significant 
  specific 
  character 
  by 
  Pusch. 
  As 
  the 
  type 
  is 
  one 
  such 
  fe- 
  

   male, 
  the 
  only 
  one 
  of 
  the 
  species 
  serving 
  as 
  basis 
  for 
  a 
  name, 
  Pusch 
  

   assigned 
  all 
  similar 
  females 
  from 
  whatever 
  locality 
  to 
  cuscinus. 
  A 
  

   tufted 
  female 
  from 
  Santa 
  Marta, 
  Colombia, 
  induced 
  Pusch 
  to 
  synony- 
  

   mize 
  malitiosus 
  with 
  cuscinus. 
  Females 
  with 
  dark 
  foreheads 
  recorded 
  

   by 
  Lonnberg 
  under 
  gracilis 
  (see 
  unicolor 
  above) 
  , 
  were 
  also 
  assigned 
  b}?" 
  

   Pusch 
  to 
  cuscinus. 
  This 
  sexual 
  character, 
  plus 
  the 
  unusually 
  short 
  

   head 
  and 
  body 
  length 
  ascribed 
  to 
  the 
  type, 
  may 
  have 
  prompted 
  Pusch 
  

   (1941, 
  p. 
  219) 
  into 
  pursuing 
  a 
  complicated 
  sequence 
  of 
  imaginary 
  

   evolutionary 
  processes 
  in 
  an 
  attempt 
  to 
  demonstrate 
  that 
  cuscinus 
  

   was 
  the 
  most 
  primitive 
  species 
  of 
  the 
  genus 
  and 
  most 
  nearly 
  related 
  

   to 
  Aotu^. 
  

  

  Specimens 
  examined. 
  — 
  Two. 
  Uvini, 
  Rio 
  Cosireni, 
  Cuzco, 
  Peru, 
  2 
  

   (U.S.N.M.). 
  

  

  CEBUS 
  ALBIFRONS 
  AEQUATOKIALIS 
  Allen 
  

  

  Cebus 
  chrysopus, 
  Pucheran 
  {nee 
  Lesson), 
  Rev. 
  Mag. 
  Zool. 
  Paris, 
  ser, 
  2, 
  vol. 
  9, 
  

   pp. 
  347-8, 
  1857 
  (menagerie 
  specimen 
  said 
  to 
  be 
  from 
  the 
  forests 
  of 
  Guayaquil, 
  

   Ecuador). 
  

  

  Cebus 
  albifrons, 
  Festa 
  {nee 
  Humboldt), 
  Boll. 
  Mus. 
  Zool. 
  Anat. 
  Comp. 
  Torino, 
  

   vol. 
  18, 
  p. 
  6, 
  1903 
  (part; 
  Rfo 
  Peripa 
  and 
  Vinces, 
  Ecuador; 
  versicolor 
  and 
  

   chrysopus 
  of 
  Pucheran 
  synonyms). 
  

  

  Cebus 
  flavescens 
  cuscinus, 
  Festa 
  {nee 
  Thomas), 
  Boll. 
  Mus. 
  Zool. 
  Anat. 
  Comp. 
  

   Torino, 
  vol. 
  18, 
  p. 
  6, 
  1903 
  (part; 
  Vinces, 
  western 
  Ecuador 
  only). 
  

  

  Cebus 
  aequatorialis 
  Allen, 
  Bull. 
  Amer. 
  Mus. 
  Nat. 
  Hist., 
  vol. 
  33, 
  p. 
  654. 
  — 
  Lonn- 
  

   berg, 
  Arkiv 
  Zool., 
  Stockholm, 
  vol. 
  14, 
  No. 
  4, 
  p. 
  6, 
  1921 
  (Gualea, 
  3,000 
  and 
  

   5,000 
  ft. 
  altitudes), 
  — 
  Cabrera, 
  Bev. 
  Real 
  Acad. 
  Cienc, 
  Madrid, 
  vol. 
  16, 
  

   ser. 
  2, 
  p. 
  230, 
  1917. 
  

  

  C[ebus] 
  c[apucinus] 
  gracilis, 
  Pusch 
  {nee 
  Spix), 
  Zeitschr. 
  ftir 
  Sauget., 
  vol. 
  16, 
  p. 
  192, 
  

   1941 
  (part; 
  western 
  Ecuadorian 
  records 
  only: 
  Mindo, 
  Vinces). 
  

  

  C[ebus] 
  c[apucinus] 
  versicolor, 
  Pusch 
  {nee 
  Pucheran), 
  Zeitschr. 
  fur 
  Sauget., 
  vol. 
  

   16, 
  p. 
  193, 
  1941 
  (part; 
  Guayaquil). 
  

  

  Holotype. 
  — 
  Adult 
  female, 
  skin 
  and 
  skull, 
  A.M.N.H. 
  No. 
  34273; 
  

   collected 
  January 
  7, 
  1913, 
  by 
  William 
  B. 
  Richardson. 
  

  

  Type 
  locality. 
  — 
  Province 
  of 
  Manavl, 
  western 
  Ecuador; 
  near 
  sea 
  level. 
  

  

  Distribution. 
  — 
  Northwestern 
  Ecuador; 
  coast 
  and 
  western 
  slopes 
  of 
  

   the 
  Cordillera 
  Occidental 
  to 
  not 
  more 
  than 
  2,000 
  meters 
  above 
  sea 
  

   level. 
  

  

  Characters. 
  — 
  See 
  original 
  description 
  and 
  literature 
  references. 
  

  

  Remarks. 
  — 
  The 
  five 
  original 
  specimens 
  of 
  aequatorialis, 
  including 
  

   one 
  from 
  Gualea, 
  recorded 
  by 
  Allen, 
  were 
  examined 
  by 
  the 
  writer 
  

   but 
  not 
  compared 
  with 
  material 
  described 
  in 
  this 
  paper. 
  Individuals 
  

   of 
  the 
  coast 
  are 
  brightly 
  colored, 
  like 
  unicolor. 
  Those 
  of 
  the 
  mountains 
  

   are 
  darker. 
  Lonnberg 
  described 
  specimens 
  from 
  Gualea 
  as 
  darker 
  

   than 
  topotypes 
  and 
  suggested 
  that 
  they 
  may 
  represent 
  a 
  darker 
  race 
  

  

  