﻿376 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  B8 
  

  

  Coloration 
  oj 
  paratypes 
  (old 
  adult 
  male 
  paratopotype; 
  two 
  males, 
  

   one 
  adult, 
  and 
  one 
  young 
  female 
  from 
  "Rio 
  Napo, 
  abajo"). 
  — 
  The 
  

   paratopotype 
  shows 
  least 
  contrast 
  between 
  colors 
  of 
  front 
  and 
  back; 
  

   sides 
  of 
  face 
  mixed 
  Cinnamon-BufF 
  and 
  Snuff 
  Brown; 
  dark 
  brown 
  cap 
  

   with 
  line 
  extending 
  to 
  between 
  eyes; 
  median 
  dorsal 
  band 
  Tawny, 
  

   side 
  of 
  back 
  and 
  lateral 
  fringe 
  Sayal 
  Brown 
  ; 
  chin 
  Pinkish 
  Buff, 
  chest 
  

   Light 
  Buff, 
  hairs 
  of 
  belly 
  Ochraceous-Buff 
  to 
  Ochraceous-Orange 
  

   terminally, 
  buffy 
  basally; 
  outer 
  side 
  of 
  upper 
  arm 
  Sayal 
  Brown, 
  of 
  

   forearm 
  paler, 
  inner 
  surface 
  of 
  arm 
  Pinkish 
  Buff 
  proximally 
  becoming 
  

   Cinnamon-Buff 
  terminally; 
  outer 
  side 
  of 
  hmd 
  limb 
  like 
  sides 
  of 
  back, 
  

   inner 
  side 
  Cinnamon-Buff 
  proximally 
  to 
  Cinnamon 
  terminally; 
  tail 
  

   Bister 
  above, 
  below 
  Prout's 
  Brown 
  on 
  proximal 
  half, 
  Ochraceous- 
  

   Orange 
  terminally, 
  the 
  hairs 
  buffy 
  basally. 
  Young 
  female 
  from 
  

   Rio 
  Napo 
  like 
  holotype 
  but 
  without 
  superciliary 
  brush, 
  a 
  midfrontal 
  

   line 
  present, 
  sides 
  of 
  face 
  paler. 
  Young 
  and 
  adult 
  male 
  from 
  Rio 
  

   Napo 
  paler 
  throughout 
  than 
  holotype. 
  

  

  Measurements. 
  — 
  Those 
  of 
  the 
  type 
  followed 
  by 
  those 
  of 
  the 
  male 
  

   paratopotype: 
  Head 
  and 
  body, 
  370, 
  430; 
  tail, 
  450, 
  470; 
  hind 
  foot, 
  122, 
  

   140; 
  ear, 
  35, 
  40; 
  greatest 
  length 
  of 
  skull, 
  96.0, 
  106.7; 
  condylobasal 
  

   length, 
  68.1, 
  81.4; 
  zygomatic 
  breadth, 
  59.9, 
  70.2; 
  width 
  of 
  brain 
  case, 
  

   53.2, 
  54.2; 
  length 
  of 
  brain 
  case, 
  74.7, 
  82.0; 
  orbital 
  breadth, 
  49.8, 
  58.9; 
  

   greatest 
  width 
  across 
  maxillary 
  tooth 
  rows, 
  29.0, 
  32.1; 
  length, 
  upper 
  

   canine 
  to 
  M^ 
  27.2, 
  28.5; 
  length, 
  lower 
  canine 
  to 
  M3, 
  29.5, 
  32.5; 
  

   mandibular 
  depth 
  at 
  condyle, 
  24.9, 
  29.9 
  mm. 
  

  

  Remarks. 
  — 
  The 
  dominantly 
  grayish 
  forearms, 
  face, 
  and 
  underparts 
  

   of 
  yuracus 
  are 
  most 
  distinctive. 
  The 
  blackish 
  limbed, 
  "tufted" 
  

   Cehus 
  apella 
  macrocephalus 
  extends 
  into 
  the 
  range 
  of 
  the 
  present 
  pale- 
  

   limbed 
  representative 
  of 
  Cehus 
  albifrons. 
  Quechua-speaking 
  Indians 
  

   of 
  the 
  region 
  distinguish 
  the 
  first 
  by 
  the 
  name 
  yana-machin 
  (black, 
  

   or 
  dark, 
  Cehus) 
  from 
  the 
  second 
  which 
  they 
  call 
  yurac-machin 
  (white 
  

   or 
  pale, 
  Cehus) 
  . 
  

  

  Specimens 
  examined. 
  — 
  Five. 
  Montalvo, 
  Rio 
  Bobonaza, 
  2 
  (C.N. 
  

   H.M.); 
  Rio 
  Napo 
  "abajo," 
  eastern 
  Ecuador, 
  3 
  (C.N.H.M.). 
  

  

  CEBUS 
  ALBIFRONS 
  CUSCINUS 
  Thomas 
  

  

  Cehus 
  ftavescens 
  cuscinus 
  Thomas, 
  Ann. 
  Mag. 
  Nat. 
  Hist., 
  ser. 
  7, 
  vol. 
  7, 
  p. 
  179, 
  

  

  1901. 
  — 
  Cabrera, 
  Rev. 
  Real 
  Acad. 
  Cienc. 
  Madrid, 
  vol. 
  16, 
  ser, 
  2, 
  p. 
  229, 
  1917 
  

  

  (synonym 
  of 
  gracilis). 
  

   Cehus 
  unicolor 
  cuscinus, 
  Elliot, 
  A 
  review 
  of 
  the 
  Primates, 
  vol. 
  2, 
  p. 
  92, 
  1913. 
  — 
  

  

  Thomas, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  58, 
  p. 
  220, 
  1920 
  (Uvini, 
  Rfo 
  Cosireni, 
  

  

  5,000 
  feet). 
  

   C[ebus] 
  c[uscinus\ 
  cuscinus, 
  Ptjsch, 
  Zeitschr. 
  fiir 
  Sauget., 
  vol. 
  16, 
  p. 
  196, 
  1941 
  

  

  (part; 
  Chicosa, 
  Urubama 
  records 
  only). 
  

   C[ebus] 
  c[apucinus\ 
  gracilis, 
  Pusch, 
  Zeitschr. 
  fiir 
  Sauget., 
  vol. 
  16, 
  p. 
  192, 
  1941 
  

  

  part; 
  Chvmchunas, 
  only). 
  

  

  Holotype. 
  — 
  Old 
  female, 
  skin 
  and 
  skull, 
  B.M. 
  No. 
  98.11.6.1; 
  collected 
  

   April 
  21, 
  1898, 
  by 
  Otto 
  Garlepp. 
  

  

  