﻿THE 
  SPIDER 
  MONKEYS 
  KELLOGG 
  AND 
  GOLDMAN 
  35 
  

  

  One 
  specinien 
  fn)iu 
  Juchitan, 
  Oaxaca, 
  has 
  silvery 
  whitish 
  under- 
  

   parts, 
  and 
  another 
  from 
  the 
  same 
  locality 
  is 
  normally 
  colored. 
  A 
  

   very 
  y()un<2: 
  individual 
  from 
  Santa 
  Eli<r('nia, 
  Oaxaca, 
  does 
  not 
  differ 
  

   aj>preciably 
  in 
  color 
  from 
  adults 
  from 
  the 
  same 
  locality. 
  One 
  very 
  

   younjnr 
  one 
  from 
  Tehuantepec 
  has 
  the 
  upperparts 
  normally 
  colored, 
  

   and 
  another 
  from 
  the 
  same 
  locality 
  is 
  uiuisually 
  daik. 
  tlie 
  luinl)ar 
  re- 
  

   gion 
  nearly 
  as 
  dark 
  as 
  the 
  upper 
  back. 
  

  

  Specimens 
  examined. 
  — 
  Total 
  numl)er, 
  59, 
  as 
  follows: 
  Mexico: 
  

   Oaxaca 
  : 
  Juchitsin, 
  3 
  (A.M.X.H.) 
  ; 
  Oaxaca, 
  without 
  delinite 
  locality, 
  

   4 
  (A. 
  M. 
  X. 
  H.) 
  ; 
  Santa 
  Eligenia, 
  13; 
  Tehuantepec, 
  4 
  (one 
  skull 
  without 
  

   skin. 
  A.M.X.H.; 
  one 
  skull 
  without 
  skin, 
  U.M.M.Z.) 
  ; 
  Tuxtepec, 
  2. 
  

   Tahax'o: 
  Teapa. 
  1. 
  Veracruz 
  : 
  Barranca 
  de 
  Boca, 
  Canton 
  de 
  Jalapa, 
  

   1 
  (skin 
  only) 
  ; 
  Cuatotolapan,2 
  (skulls 
  only, 
  U. 
  M. 
  M. 
  Z.) 
  ; 
  Pasa 
  Xueva, 
  

   VJ 
  (2 
  skulls 
  without 
  skins, 
  A. 
  M. 
  N. 
  H.). 
  Hondukas: 
  Tegucigalpa: 
  

   Cantoral. 
  1 
  (A.M.X.H): 
  Guaymaca, 
  2 
  (A.M.X.H.). 
  Olancho: 
  

   C'atacamas, 
  1 
  (A.M.X.H.). 
  Ocotepeque 
  : 
  El 
  Chorro, 
  east 
  side 
  of 
  

   Ocotepeque, 
  4.500 
  feet, 
  1 
  (skin 
  only, 
  A.M.X'^.H). 
  El 
  Salvador: 
  San 
  

   Mi^nicl 
  : 
  Lake 
  Olomega 
  [=Laguna 
  Lomego], 
  5 
  (C. 
  D.), 
  

  

  ATELES 
  GEOFFROYI 
  YUCATANENSIS, 
  new 
  subspecies 
  

  

  Yucatan 
  Spider 
  Monkey 
  

  

  Tj/pe 
  locaVti}/. 
  — 
  Puerto 
  Morelos, 
  northea.st 
  coast 
  of 
  Quintana 
  Roo, 
  

   Mexico; 
  altitude 
  100 
  feet. 
  

  

  Type 
  specimen. 
  — 
  Male 
  adult, 
  skin 
  and 
  skull; 
  U. 
  S. 
  N. 
  M. 
  No. 
  108531 
  

   (Tiiological 
  Surveys 
  collection) 
  ; 
  collecled 
  April 
  2, 
  11)01, 
  by 
  E. 
  AV. 
  

   X(Is(jn 
  and 
  E. 
  A. 
  Goldman; 
  original 
  number 
  14052. 
  

  

  Distribution. 
  — 
  Forests 
  of 
  the 
  Yucatan 
  Peninsula, 
  northeastern 
  

   Guatemala, 
  and 
  ])robably 
  adjoining 
  parts 
  of 
  British 
  Honduras; 
  

   doubtless 
  intergrading 
  to 
  the 
  .southward 
  with 
  vcUcrosus. 
  

  

  General 
  characters. 
  — 
  A 
  rather 
  small, 
  slender, 
  light-colored 
  race, 
  

   with 
  entire 
  underparts 
  silvery 
  whitish 
  or 
  very 
  pale 
  buff, 
  pelage 
  short 
  

   and 
  thin. 
  Size 
  about 
  as 
  in 
  vrUiVoimfi 
  of 
  Veracruz 
  but 
  decidedly 
  paler, 
  

   especially 
  on 
  underparts 
  where 
  in 
  typical 
  specimens 
  a 
  whitish 
  silvery 
  

   tone 
  extends 
  to 
  neck 
  and 
  inner 
  sides 
  of 
  limbs; 
  underside 
  of 
  tail 
  

   '•ream-buff 
  to 
  near 
  callosity; 
  frontal 
  outline 
  of 
  skull 
  more 
  i)rominent. 
  

  

  Color. 
  — 
  Type: 
  Top 
  of 
  head, 
  neck, 
  and 
  outer 
  surfaces 
  of 
  fordimbs 
  

   brownish 
  black, 
  pa.s.sing 
  gradually 
  through 
  cinnamon-drab 
  and 
  light 
  

   drab 
  on 
  shoulders 
  and 
  anterior 
  part 
  of 
  back 
  to 
  near 
  olive-bull 
  on 
  

   hips, 
  the 
  light 
  drab 
  extending 
  along 
  nie<lian 
  line 
  to 
  base 
  of 
  tail: 
  fa<e 
  

   mainly 
  dusky, 
  but 
  cheeks 
  whitish; 
  knees 
  brownish 
  black: 
  res( 
  of 
  outer 
  

   surfaces 
  of 
  hind 
  limbs 
  cinnamon-drab; 
  entire 
  under|)arts 
  inebHJing 
  

   underside 
  of 
  neck, 
  inner 
  surfaces 
  of 
  limbs 
  to 
  wrists 
  and 
  ankles 
  thinly 
  

   haired, 
  between 
  crcam-buir 
  and 
  silvery 
  whili.sh; 
  hands 
  and 
  feet 
  black- 
  

   ish; 
  tail 
  cinnamon-diab 
  above 
  and 
  on 
  sides. 
  becoming 
  cream-bulf 
  below 
  

   along 
  median 
  line 
  from 
  base 
  to 
  near 
  callosity. 
  

  

  