﻿THE 
  SPIDER 
  MONKEYS 
  — 
  KELLOGG 
  AND 
  GOLD^LVX 
  41 
  

  

  thirds, 
  bec<)inin<r 
  clear 
  black 
  toward 
  tip, 
  bolow 
  deep 
  ferruginous 
  to 
  near 
  

   callosity 
  where 
  blackish 
  hairs 
  extend 
  all 
  around. 
  The 
  ji;round 
  color 
  

   of 
  body 
  in 
  other 
  specimens 
  grades 
  from 
  dark 
  rusty 
  reddish 
  to 
  ferru- 
  

   <:in(»us 
  or 
  burnt 
  sienna, 
  and 
  a 
  narrow 
  ferrurrinous 
  or 
  cinnamon-buff 
  

   streak 
  usually 
  extends 
  long 
  inner 
  side 
  of 
  upper 
  arm 
  from 
  armpit 
  to 
  

   elbow. 
  

  

  /Sk-i/IL 
  — 
  Very 
  similar 
  to 
  that 
  of 
  groffroyi, 
  but 
  brain 
  case 
  rather 
  broad. 
  

  

  Measurements. 
  — 
  Type: 
  Total 
  lenirth, 
  1.-2H0 
  mm.; 
  tail 
  vertebrae, 
  840; 
  

   hind 
  foot, 
  194. 
  An 
  adult 
  male 
  and 
  ftinale 
  from 
  Cerro 
  Azul, 
  respec- 
  

   tively: 
  Total 
  leuirth, 
  1.280. 
  1.225; 
  tail 
  vertebrae. 
  786, 
  785; 
  hind 
  foot, 
  

   183, 
  176. 
  Skull 
  (type): 
  Greatest 
  length, 
  112.8; 
  orbital 
  width, 
  62; 
  

   postorbital 
  constriction, 
  52.4: 
  wiilth 
  of 
  brain 
  case, 
  61.2; 
  zygomatic 
  

   breatlth, 
  68: 
  maxillary 
  tooth 
  row, 
  '^7.3. 
  An 
  adult 
  nuile 
  and 
  female 
  

   from 
  Cerro 
  Azul. 
  respectively: 
  Greatest 
  length, 
  114.2, 
  109.1; 
  orbital 
  

   width, 
  62.7, 
  59.4; 
  postorbital 
  constriction, 
  53, 
  50.3; 
  width 
  of 
  brain 
  case, 
  

   63.2. 
  61.4: 
  zygomatic 
  width, 
  70.2, 
  69.6; 
  maxillary 
  tooth 
  row 
  31, 
  28.1. 
  

  

  /i'> 
  nurrkft. 
  — 
  This 
  is 
  the 
  monkey 
  conunoidy 
  known 
  as 
  ''mono 
  colo- 
  

   ra<l<i" 
  in 
  Panama 
  and 
  western 
  Costa 
  Rica. 
  It 
  is 
  the 
  most 
  intensely 
  

   reel 
  of 
  all 
  the 
  races 
  of 
  Middle 
  America, 
  but 
  despite 
  this 
  it 
  has 
  been 
  

   generally 
  confused 
  with 
  the 
  liglit 
  bulFy 
  form, 
  geoffroiji, 
  of 
  Nicaragua. 
  

   While 
  the 
  ground 
  color 
  of 
  most 
  of 
  the 
  body 
  appears 
  to 
  be 
  ferruginous 
  

   to 
  burnt 
  sienna 
  in 
  ordinary 
  light, 
  in 
  strong 
  light 
  and 
  particularly 
  in 
  

   direct 
  sunlight 
  individual 
  hairs 
  on 
  the 
  upperjKirts 
  are 
  .seen 
  to 
  have 
  

   glos.sy 
  subtcrminal 
  bands 
  giving 
  that 
  part 
  of 
  the 
  pelage 
  a 
  golden- 
  

   yellowish 
  sheen, 
  a 
  peculiarity 
  still 
  more 
  pronounced 
  in 
  ornaPufi 
  and 
  

   not 
  shared 
  with 
  the 
  more 
  northern 
  races. 
  The 
  specimens 
  from 
  

   Chiriqui 
  and 
  as 
  far 
  west 
  as 
  central-western 
  Costa 
  Rica 
  agi'ee 
  closely 
  

   in 
  color 
  with 
  those 
  from 
  the 
  (^anal 
  Zone 
  in 
  the 
  vicinity 
  of 
  the 
  tyi>e 
  

   locality. 
  In 
  one 
  sjiecimen 
  of 
  a 
  series 
  of 
  six 
  skins 
  from 
  Pozo 
  Azul, 
  

   Costa 
  Rica, 
  a 
  white 
  patch 
  on 
  the 
  forehead 
  is 
  nearly 
  concealed 
  in 
  front 
  

   by 
  loiiL'er 
  black-tipped 
  hairs 
  and 
  the 
  cheeks 
  are 
  dull 
  whitish 
  or 
  ]>alo 
  

   huffy. 
  

  

  Specimens 
  examined. 
  — 
  Totiil 
  mimbci-, 
  21. 
  as 
  follows: 
  Cosia 
  Rir.v 
  : 
  

   Canas 
  Gordas. 
  Puntarenas, 
  3 
  (A. 
  M. 
  X. 
  II.) 
  ; 
  Kl 
  Pozo, 
  12 
  niiles 
  above 
  

   n)oiifb 
  of 
  Ri'o 
  Grande 
  de 
  Terraba, 
  1 
  (slcin 
  only, 
  A. 
  M. 
  N. 
  II.) 
  ; 
  Pozo 
  

   A/nl. 
  10 
  miles 
  above 
  mouth 
  of 
  Rio 
  Grande 
  de 
  Pirris, 
  12 
  (3, 
  C. 
  M.; 
  4 
  

   skins 
  with 
  skulls 
  and 
  5 
  extra 
  .skulls, 
  A. 
  M. 
  N. 
  II.). 
  P.\nam.\: 
  Cerro 
  

   Azid, 
  near 
  head 
  of 
  Chagres 
  River, 
  2; 
  Cerro 
  Brujo 
  {{\\)v 
  locality), 
  1; 
  

   Coto, 
  Chiriqui, 
  2 
  (M. 
  C. 
  Z.) 
  ; 
  Rfo 
  Pequeni, 
  Canal 
  Z(me, 
  2 
  (M. 
  C. 
  Z.) 
  ; 
  

   Snn 
  Juan. 
  Chagres 
  River. 
  1. 
  

  

  ATELE.S 
  GROFPROVI 
  A7.URRKNSIS 
  Bole 
  

  

  Azi'ERO 
  Spider 
  Monkey 
  

  

  Atrlrs 
  n:urrfn.«iif 
  Hoik. 
  S<1. 
  I'lihl. 
  flfvi-liiinl 
  Mus. 
  Nut. 
  Illst., 
  vol. 
  7, 
  p. 
  149, 
  AuR. 
  

   .31. 
  i;t.37. 
  

  

  