﻿380 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  93 
  

  

  Ochraceous-Buff, 
  remainder 
  of 
  back 
  buffy 
  brovsni, 
  sides 
  paler, 
  

   lateral 
  fringe 
  Pinkish 
  Buff; 
  outer 
  side 
  of 
  limbs 
  Ociiraceous-Buff, 
  inner 
  

   side 
  paler, 
  to 
  silvery; 
  upper 
  surface 
  of 
  tail 
  Snuff 
  Brown, 
  the 
  hairs 
  

   with 
  ochraceous 
  tips, 
  undersurface 
  Ochraceous-Buff 
  proximally 
  to 
  

   silvery 
  terminally. 
  

  

  Measurements. 
  — 
  Of 
  an 
  adult 
  male 
  and 
  subadult 
  female: 
  Greatest 
  

   length 
  of 
  skull, 
  94.2, 
  89.8; 
  condylobasal 
  length, 
  69.2, 
  64.4; 
  zygomatic 
  

   breadth, 
  63.6, 
  — 
  ; 
  width 
  of 
  brain 
  case, 
  49.9, 
  46.5; 
  length 
  of 
  brain 
  case, 
  

   77.4, 
  72.9; 
  orbital 
  breadth, 
  54,2, 
  48.9; 
  greatest 
  width 
  across 
  maxillary 
  

   tooth 
  rows, 
  29,4, 
  27.1; 
  length, 
  upper 
  canine 
  to 
  M^, 
  26.1, 
  23.9; 
  length, 
  

   lower 
  canine 
  to 
  M3, 
  29,4, 
  27.6; 
  mandibular 
  depth 
  at 
  condyle, 
  28.5, 
  

   23.9 
  mm. 
  

  

  Remarks.' 
  — 
  Existence 
  of 
  a 
  form 
  of 
  Cebus 
  on 
  the 
  island 
  of 
  Ti-inidad 
  

   has 
  been 
  known 
  for 
  a 
  long 
  time. 
  Besides 
  the 
  fragmentary 
  type, 
  

   there 
  is 
  a 
  specimen 
  in 
  the 
  Paris 
  Museum 
  recorded 
  by 
  Pusch, 
  one 
  

   each 
  in 
  the 
  American 
  Museum 
  of 
  Natural 
  History 
  and 
  the 
  Chicago 
  

   Natural 
  History 
  Museum; 
  and 
  in 
  the 
  United 
  States 
  National 
  Mu- 
  

   seum 
  a 
  skull 
  only, 
  in 
  addition 
  to 
  the 
  two 
  individuals 
  described 
  above. 
  

   Nearest 
  known 
  relatives 
  of 
  trinitatis 
  occur 
  in 
  the 
  upper 
  Orinoco 
  

   region 
  (albifrons) 
  and 
  in 
  the 
  Lake 
  Maracaibo 
  region 
  (adustus). 
  On 
  

   the 
  mainland 
  opposite 
  Trinidad, 
  only 
  C. 
  nigrivittatus 
  is 
  laiown. 
  In 
  

   the 
  Guianas 
  and 
  the 
  lower 
  Orinoco 
  region 
  both 
  nigrivittatus 
  and 
  

   "tufted" 
  C. 
  apella 
  further 
  insulate 
  trinitatis 
  from 
  other 
  members 
  of 
  

   its 
  species. 
  There 
  are 
  alteroative 
  explanations 
  for 
  this 
  wide 
  gap 
  in 
  

   the 
  range 
  of 
  the 
  species. 
  Distribution 
  of 
  C. 
  albifrons 
  may 
  have 
  been 
  

   continuous 
  along 
  the 
  Venezuelan 
  coast 
  before 
  separation 
  of 
  Trinidad 
  

   from 
  the 
  mainland, 
  or 
  the 
  mico 
  was 
  introduced 
  into 
  the 
  island 
  tlirough 
  

   human 
  agency. 
  The 
  latter 
  theory 
  is 
  the 
  more 
  probable. 
  Wild, 
  liv- 
  

   ing 
  monkeys 
  are 
  known 
  from 
  a 
  number 
  ol 
  American 
  islands. 
  Cebus 
  

   apella 
  is 
  represented 
  in 
  Margarita 
  Island, 
  Venezuela, 
  C. 
  capucinus 
  in 
  

   Gorgona 
  Island, 
  Colombia; 
  remains 
  of 
  an 
  Ateles, 
  which 
  may 
  have 
  

   been 
  a 
  household 
  pet, 
  have 
  been 
  found 
  in 
  Cuba. 
  The 
  only 
  other 
  

   monkey 
  inhabiting 
  the 
  island 
  of 
  Trinidad 
  is 
  the 
  red 
  howler, 
  Alouatta 
  

   seniculus 
  insularis. 
  Isolation 
  of 
  these 
  monkeys 
  can 
  hardly 
  be 
  

   accounted 
  for 
  on 
  the 
  basis 
  of 
  natural 
  zoogeographical 
  factors. 
  

  

  Specimens 
  examined. 
  — 
  Three. 
  Nariva 
  Swamp, 
  Trinidad, 
  3, 
  one 
  

   with 
  skull 
  only 
  (U.S.N.M.). 
  

  

  GENUS 
  ATELES 
  GEOFFROY: 
  SPIDER 
  MONKEYS, 
  OR 
  MARIMONDAS 
  

  

  The 
  genus 
  Ateles 
  has 
  been 
  reviewed 
  recently 
  by 
  KeUogg 
  and 
  Gold- 
  

   man 
  (1944).^ 
  According 
  to 
  these 
  authors, 
  spider 
  monkeys 
  are 
  repre- 
  

  

  ' 
  Overlooked 
  by 
  the 
  authors 
  is 
  "Ateles 
  Beehebuth 
  Geoff., 
  Varietas 
  tnangulifera" 
  Weinland 
  (Zool. 
  Oart. 
  

   Frankfurt 
  a 
  M., 
  Jahrg. 
  3, 
  No. 
  9, 
  pp. 
  206-207, 
  fig., 
  1862). 
  The 
  name 
  is 
  based 
  on 
  a 
  menagerie 
  individual 
  of 
  

   untmown 
  origin. 
  Judged 
  by 
  the 
  description, 
  the 
  type 
  is 
  most 
  probably 
  a 
  representative 
  of 
  one 
  of 
  the 
  

   Central 
  American 
  races 
  of 
  Ateles 
  geoffroyi. 
  For 
  the 
  present, 
  there 
  is 
  no 
  good 
  reason 
  for 
  giving 
  priority 
  to 
  

   triangitlifera 
  over 
  any 
  of 
  the 
  later 
  named 
  forms 
  recognized 
  by 
  Kellogg 
  and 
  Goldman. 
  

  

  