﻿28 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  sented 
  by 
  A. 
  paniscus 
  chamek 
  of 
  Peru, 
  the 
  brownish 
  head 
  is 
  distinc- 
  

   tive: 
  other 
  differences 
  are 
  the 
  short 
  whitish 
  hairs 
  on 
  chin 
  (chin 
  nearly 
  

   naked 
  and 
  white 
  hairs 
  absent 
  in 
  chamek) 
  ; 
  shorter, 
  coarser 
  pelage, 
  the 
  

   crown 
  patch 
  less 
  projecting 
  over 
  forehead, 
  the 
  shorter-haired 
  tail, 
  

   smaller 
  foot, 
  and 
  cranial 
  details. 
  

  

  Color. 
  — 
  Face 
  and 
  upturned 
  hairs 
  on 
  forehead 
  black; 
  crown 
  cap 
  

   tawny-olive, 
  yellowish 
  wood 
  brown, 
  or 
  with 
  black 
  hairs 
  tipped 
  with 
  

   burnt 
  umber; 
  remainder 
  of 
  body, 
  including 
  limbs 
  and 
  tail, 
  covered 
  

   with 
  black 
  hairs 
  tinged 
  with 
  burnt 
  umber. 
  

  

  ShuU. 
  — 
  Skull 
  of 
  medium 
  size 
  and 
  proportions; 
  premaxillae 
  mod- 
  

   erately 
  extended 
  anteriorly; 
  rostrum 
  rather 
  short 
  and 
  nasal 
  opening 
  

   of 
  medium 
  length 
  ; 
  auditory 
  bullae 
  somewhat 
  flattened. 
  Skull 
  similar 
  

   to 
  that 
  of 
  the 
  related 
  form 
  rohustus. 
  Compared 
  with 
  that 
  of 
  panisciis 
  : 
  

   Premaxillae 
  less 
  produced 
  anteriorly 
  beyond 
  plane 
  of 
  canines 
  and 
  

   anterior 
  nasal 
  opening 
  less 
  elongated. 
  

  

  Measure^nents. 
  — 
  An 
  adult 
  male 
  and 
  female 
  from 
  Hacienda 
  Chini- 
  

   pamba, 
  near 
  Penaherrera, 
  Ecuador, 
  respectively 
  : 
  Total 
  length, 
  1,090, 
  

   1,281 
  mm.; 
  tail, 
  720, 
  770; 
  hind 
  foot, 
  160, 
  li69. 
  An 
  adult 
  female 
  from 
  

   Cordillera 
  de 
  Chilluri, 
  Ecuador: 
  Total 
  length, 
  1,194; 
  tail, 
  655; 
  hind 
  

   foot, 
  152. 
  Skull: 
  An 
  adult 
  male 
  and 
  female 
  from 
  Hacienda 
  Chini- 
  

   pamba, 
  near 
  Penaherrera, 
  Ecuador, 
  respectively 
  : 
  Greatest 
  length, 
  

   113.7, 
  117.2; 
  orbital 
  width, 
  63.6, 
  62.5; 
  postorbital 
  constriction, 
  50.4, 
  

   48.9 
  ; 
  width 
  of 
  brain 
  case, 
  61.2, 
  61.7 
  ; 
  zygomatic 
  breadth, 
  73, 
  71.2 
  ; 
  maxil- 
  

   lary 
  tooth 
  row, 
  32.6, 
  32.2. 
  An 
  adult 
  female 
  from 
  Cordillera 
  de 
  Chil- 
  

   luri, 
  Ecuador: 
  Greatest 
  length, 
  113.8; 
  orbital 
  width, 
  58; 
  postorbital 
  

   constriction, 
  47; 
  width 
  of 
  brain 
  case, 
  59.7; 
  zygomatic 
  breadth, 
  69.6; 
  

   maxillary 
  tooth 
  row, 
  30.2. 
  

  

  Remarks. 
  — 
  Ateles 
  fusciceps 
  was 
  based 
  on 
  a 
  specimen 
  from 
  an 
  un- 
  

   known 
  locality. 
  Another 
  specimen 
  of 
  this 
  well-marked 
  monkey 
  was 
  

   collected 
  by 
  Clarence 
  Buckley 
  in 
  Transandean 
  Ecuador, 
  as 
  recorded 
  

   by 
  Sclater 
  {op. 
  cif.)^ 
  who 
  also 
  published 
  a 
  colored 
  plate. 
  For 
  pre- 
  

   cision 
  in 
  regard 
  to 
  the 
  type 
  locality, 
  however, 
  the 
  name 
  is 
  restricted 
  by 
  

   us 
  to 
  the 
  form 
  occurring 
  at 
  Hacienda 
  Chinipamba, 
  near 
  Peiiaherrera 
  

   (west 
  of 
  Ibarra), 
  Intag 
  District, 
  Imbabura 
  Province, 
  northwestern 
  

   Ecuador, 
  where 
  the 
  altitude 
  is 
  given 
  as 
  1,500 
  meters. 
  

  

  Lonnberg 
  (Arkiv 
  for 
  Zool., 
  vol. 
  14, 
  No. 
  4, 
  p. 
  5, 
  June 
  7, 
  1921) 
  has 
  

   recorded 
  specimens 
  from 
  near 
  Gualea 
  (alt. 
  4,000 
  feet) 
  and 
  Santo 
  

   Domingo 
  de 
  los 
  Colorados 
  (alt. 
  2,000 
  feet) 
  on 
  the 
  upper 
  tributaries 
  of 
  

   Rio 
  Esmeraldas, 
  northwestern 
  Ecuador. 
  

  

  Specim^n^ 
  examined. 
  — 
  Totalnumber, 
  8, 
  as 
  follows: 
  Echjador: 
  Caro- 
  

   lina 
  Ibarra, 
  Imbabura 
  Province, 
  1 
  (skull 
  only, 
  U. 
  M. 
  M. 
  Z.) 
  ; 
  Cordillera 
  

   de 
  Chilluri, 
  1 
  (U. 
  M. 
  M. 
  Z.) 
  ; 
  Gualea 
  (near), 
  Pichincha 
  Province, 
  alti- 
  

   tude 
  3,000-4,000 
  feet, 
  1 
  (M. 
  C. 
  Z.) 
  ; 
  Hacienda 
  Chinipamba, 
  near 
  Pena- 
  

   herrera, 
  Intag 
  District, 
  Imbabura 
  Province, 
  2 
  (U. 
  M. 
  M. 
  Z.) 
  ; 
  Mindo 
  

   (below), 
  Pichincha 
  Province, 
  altitude 
  4,000 
  feet, 
  1 
  (M. 
  C. 
  Z.) 
  ; 
  Par- 
  

  

  