﻿MAMMALS 
  OF 
  NORTHERN 
  COLOMBIA 
  — 
  HERSHKOVITZ 
  375 
  

  

  Pereira 
  Igarape, 
  Rio 
  Negro, 
  Brazil, 
  1 
  (A.M.N.H.); 
  Puerto 
  Victoria, 
  

   Rio 
  Pachitea, 
  Huanuco, 
  Peru, 
  2 
  (C.N.H.M.); 
  Tingo 
  Maria, 
  Rio 
  

   Huallaga, 
  Huanuco, 
  2 
  (C.N.H.M.); 
  no 
  locality, 
  Peru, 
  1 
  (C.N.H.M). 
  

  

  CEBUS 
  ALBIFRONS 
  YURACUS, 
  new 
  subspecies 
  

  

  [?] 
  Cehis 
  griseus, 
  Osculati 
  (nee 
  Desmarest), 
  Esplorazione 
  delle 
  region! 
  equa- 
  

   toriali 
  lungo 
  il 
  Napo 
  , 
  . 
  ., 
  Milan, 
  p. 
  188, 
  1850 
  (Rfos 
  Napo 
  and 
  Curaray). 
  — 
  

   CoRNALiA, 
  ibid., 
  Vertebratorum 
  synopsis, 
  p. 
  302 
  (Rio 
  Napo). 
  

  

  C[ebus] 
  albifrons, 
  Cabrera, 
  Anal, 
  See. 
  Espaflola 
  Hist. 
  Nat., 
  Madrid, 
  ser. 
  2, 
  vol. 
  

   29, 
  p. 
  78, 
  1900 
  (La 
  Coca, 
  Rio 
  Napo; 
  Rio 
  Aguarico; 
  Destacamento, 
  mouth 
  

   of 
  Rio 
  Napo); 
  Trab. 
  Mus. 
  Nac. 
  Cienc. 
  Nat., 
  Madrid, 
  No. 
  11, 
  p. 
  25, 
  1912 
  

   (Rfo 
  Coca; 
  Aguano, 
  Rio 
  Napo; 
  Destacamento). 
  — 
  Festa, 
  Boll. 
  Mus. 
  Zool. 
  

   Anat. 
  Comp. 
  Torino, 
  vol. 
  18, 
  No. 
  435, 
  p. 
  6, 
  footnote 
  1, 
  1903 
  (specimen 
  in 
  

   Museo 
  Civico 
  di 
  Milano, 
  probably 
  the 
  same 
  taken 
  by 
  Osculati 
  and 
  identi- 
  

   fied 
  by 
  Osculati 
  and 
  Cornalia 
  [op. 
  ciL, 
  supra] 
  as 
  Cebus 
  griseus). 
  

  

  Cebus 
  gracilis, 
  Cabrera 
  [nee 
  Spix], 
  Trab. 
  Mus. 
  Nac. 
  Cienc. 
  Nat., 
  Madrid, 
  ser. 
  

   zool. 
  No. 
  31, 
  p. 
  41, 
  1917 
  (Aguano, 
  Rfo 
  Napo; 
  La 
  Coca, 
  Rio 
  Napo; 
  Desta- 
  

   camento, 
  mouth 
  of 
  Rio 
  Napo) 
  . 
  

  

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

   Torino, 
  vol. 
  18, 
  No. 
  435, 
  p. 
  6, 
  1903 
  (part; 
  Granadillas, 
  eastern 
  Ecuador). 
  

  

  Cebus 
  sp. 
  c/. 
  euscinus 
  Thomas, 
  Lonnberg, 
  Arkiv 
  Zool., 
  vol. 
  14, 
  No. 
  4, 
  p. 
  6, 
  1921 
  

   (near 
  Rio 
  Curaray, 
  eastern 
  Ecuador). 
  

  

  Cebus 
  castaneus, 
  Rode 
  {nee 
  Geoffroy), 
  Bull. 
  Mus. 
  Nat. 
  Hist. 
  Nat., 
  Paris, 
  ser. 
  2, 
  

   vol. 
  9, 
  p. 
  343, 
  1937 
  (Siguin, 
  Rfo 
  Pastaza, 
  eastern 
  Ecuador). 
  

  

  Holotype.— 
  Adult 
  female, 
  skin 
  and 
  skull, 
  C.N.H.M. 
  No. 
  41493; 
  

   collected 
  February 
  14, 
  1932, 
  by 
  Ram6n 
  Olalla; 
  original 
  number 
  66. 
  

  

  Type 
  locality. 
  — 
  Montalvo, 
  a 
  site 
  on 
  left 
  bank 
  of 
  Rio 
  Bobonaza 
  

   about 
  45 
  kilometers 
  above 
  its 
  junction 
  with 
  the 
  Rio 
  Pastaza, 
  an 
  

   affluent 
  of 
  the 
  Maran6n, 
  eastern 
  Ecuador; 
  altitude 
  approximately 
  

   500 
  meters. 
  

  

  Distribution. 
  — 
  Territory 
  between 
  Rios 
  Maraiion 
  and 
  Napo, 
  eastern 
  

   Ecuador 
  and 
  northeastern 
  Peru. 
  

  

  Characters. 
  — 
  Most 
  gray 
  fronted 
  (sides 
  of 
  face, 
  chest, 
  outer 
  sides 
  of 
  

   arms) 
  race 
  of 
  albifrons. 
  Generally 
  as 
  inunicolor 
  but 
  back 
  ochraceous- 
  

   brown 
  to 
  Prout's 
  Brown, 
  outer 
  side 
  of 
  forelimb 
  sharply 
  contrasted 
  

   grayish 
  or 
  buify; 
  underparts, 
  except 
  of 
  tail, 
  extremely 
  pale, 
  silvery 
  

   to 
  Ochraceous-Orange. 
  

  

  Description 
  of 
  holotype. 
  — 
  Sides 
  of 
  face 
  light 
  Ochraceous-Buff; 
  cinna- 
  

   mon 
  superciliary 
  region 
  with 
  weakly 
  defined 
  brush. 
  Cap 
  Bister; 
  

   median 
  dorsal 
  region 
  Prout's 
  Brown, 
  sides 
  of 
  back 
  paler 
  grading 
  into 
  

   Snuff 
  Brown 
  of 
  lateral 
  fringe. 
  Hairs 
  of 
  chest, 
  belly, 
  sides 
  of 
  neck, 
  

   Light 
  Buff 
  basally. 
  Warm 
  Buff 
  terminally; 
  chin, 
  underside 
  of 
  neck, 
  

   inner 
  side 
  of 
  forelimb 
  silvery. 
  Outer 
  side 
  of 
  upper 
  arm 
  like 
  side 
  of 
  

   body, 
  of 
  forearm 
  mixed 
  ochraceous 
  and 
  buffy, 
  anterior 
  (radial) 
  surface 
  

   of 
  forearm 
  and 
  upper 
  surface 
  of 
  hand, 
  mixed 
  brown 
  and 
  buffy; 
  outer 
  

   side 
  of 
  hind 
  limb 
  Ochraceous-Tawny, 
  inner 
  side 
  Ochraceous-Buff, 
  

   upper 
  surface 
  of 
  foot 
  Sa3^ai 
  Brown. 
  Tail 
  above 
  Prout's 
  Brown, 
  

   beneath 
  Ochraceous-Tawny 
  proximally 
  to 
  Ocliraceous-Buff 
  terminally. 
  

  

  