﻿THE 
  SPIDER 
  MONKEYS 
  — 
  KELLOGG 
  AND 
  GOLDMAN 
  33 
  

  

  Atdcs 
  tricolor 
  IIoujstek, 
  Proc. 
  Bicil. 
  Soc 
  Washington, 
  vol. 
  27, 
  p. 
  141, 
  July 
  10, 
  

   1914. 
  Type 
  locality. 
  Hacienda 
  Santa 
  Ktigonia. 
  S 
  miles 
  north 
  of 
  Tapanatepec, 
  

   southeastern 
  Oaxacn. 
  

  

  Type 
  localify. 
  — 
  ?Biazil. 
  [Here 
  restricted 
  to 
  Mirador, 
  about 
  15 
  miles 
  

   northeast 
  of 
  Huatusco, 
  Veracruz, 
  Mexico; 
  altitude 
  2,000 
  feet.] 
  

  

  Type 
  spccitncn. 
  — 
  No. 
  . 
  British 
  Museum 
  (Natural 
  History). 
  

  

  DistHbution. 
  — 
  Unbroken 
  forests 
  of 
  Veracruz 
  and 
  eastern 
  San 
  Luis 
  

   Potosi 
  and 
  southeastward! 
  lhr()U<xh 
  Tabasco, 
  across 
  the 
  Isthmus 
  of 
  

   Teluiantepec 
  in 
  eastern 
  Oaxaca, 
  to 
  Honduras 
  and 
  El 
  Salvador, 
  except 
  

   for 
  highlands 
  of 
  Guatemala. 
  

  

  General 
  characters. 
  — 
  A 
  subspecies 
  distinguished 
  by 
  combination 
  of 
  

   black 
  or 
  brownish-black 
  top 
  of 
  head, 
  neck, 
  and 
  shoulders, 
  in 
  contrast 
  

   with 
  buffy 
  lumbar 
  region, 
  and 
  pinkish-buff 
  to 
  cinnamon-butf 
  under- 
  

   parts. 
  Differs 
  from 
  yucatafnensis 
  of 
  Quintana 
  Roo 
  in 
  deeper 
  buff 
  

   underparts 
  (underparts 
  in 
  yucatanensis 
  silvery 
  white 
  or 
  light 
  buff). 
  

   Differs 
  from 
  pan 
  of 
  Guatemala 
  in 
  greater 
  contrast 
  in 
  colors 
  of 
  upper- 
  

   parts 
  (in 
  pan 
  the 
  upper 
  back 
  and 
  lumbar 
  region 
  are 
  more 
  nearly 
  uni- 
  

   form 
  blackish 
  in 
  tone). 
  

  

  Color. 
  — 
  Top 
  of 
  head, 
  neck, 
  shoulders, 
  outer 
  surfaces 
  of 
  fore 
  and 
  

   hind 
  limbs, 
  and 
  forearms 
  all 
  around 
  varjnng 
  from 
  black 
  to 
  brownish 
  

   black, 
  passing 
  near 
  middle 
  of 
  back 
  into 
  cinnamon-buff 
  or 
  cinnamon 
  and 
  

   extending 
  across 
  lumbar 
  region 
  and 
  including 
  hips, 
  the 
  latter 
  colors 
  

   somewhat 
  darkened 
  along 
  median 
  line 
  by 
  overlying 
  brownish 
  hairs; 
  

   underparts 
  in 
  general, 
  including 
  inner 
  sides 
  of 
  arms 
  in 
  a 
  strip 
  nar- 
  

   rowing 
  from 
  armpit 
  to 
  a 
  point 
  near 
  elbows 
  and 
  on 
  inner 
  sides 
  of 
  

   legs 
  to 
  near 
  ankles, 
  varying 
  from 
  pinkish 
  buff 
  to 
  cinnamon-buff, 
  be- 
  

   coming 
  near 
  cinnamon 
  on 
  sides 
  of 
  body; 
  underside 
  of 
  neck 
  varying 
  

   from 
  grayish 
  to 
  a 
  mixture 
  of 
  buffy-gray 
  and 
  brown; 
  face 
  blackish, 
  

   but 
  lips 
  and 
  small 
  tufts 
  near 
  sides 
  of 
  mouth 
  are 
  didl 
  whitish 
  in 
  some 
  

   specimens; 
  hands 
  and 
  feet 
  black; 
  tail 
  above 
  black 
  or 
  brownish 
  black, 
  

   mixed 
  below 
  with 
  buffy 
  Juiirs 
  in 
  a 
  median 
  lijio 
  gradually 
  narrowing 
  

   from 
  base 
  to 
  near 
  callosity. 
  

  

  SkxiU. 
  — 
  Rather 
  narrow, 
  but 
  closely 
  similar 
  in 
  general 
  to 
  those 
  of 
  

   the 
  other 
  subspecies. 
  Comi)ared 
  witli 
  yurafanrvsf.s 
  the 
  frontal 
  region 
  

   of 
  the 
  skull 
  is 
  slightly 
  flatter, 
  less 
  convex 
  along 
  median 
  line 
  anteriorly, 
  

   as 
  shown 
  in 
  profile. 
  

  

  Mea.'<nrem/'nt!<. 
  — 
  Two 
  adult 
  males 
  from 
  Sania 
  Kfigenia, 
  Oaxaca, 
  

   resi)ectively: 
  Total 
  length, 
  1,200, 
  1,260 
  mm.; 
  tail 
  vertebrae, 
  7G0, 
  705; 
  

   hind 
  foot, 
  17G, 
  178. 
  Average 
  of 
  7 
  adult 
  females 
  from 
  Santa 
  Kligenia, 
  

   Oaxaca: 
  Total 
  length, 
  1,204 
  ( 
  1, 
  140-1, 
  .'^01 
  ) 
  ; 
  tail 
  vertebrae, 
  751 
  (700- 
  

   7ft0) 
  ; 
  hind 
  foot, 
  170 
  (17H-1H5). 
  SJcnll 
  (three 
  adult 
  males 
  from 
  Sanla 
  

   Kfigenia. 
  respectively): 
  Greatest 
  lengtli. 
  IlO.l. 
  112.5, 
  110.9; 
  orbital 
  

   width, 
  60, 
  56.3, 
  57.2; 
  post 
  orbital 
  const 
  i-iet 
  ion, 
  51.3, 
  47.6, 
  47; 
  width 
  

   of 
  brain 
  case, 
  59.3, 
  .58.5, 
  .59.6; 
  /ygoniatic 
  wi.Ith, 
  70.5, 
  63.9, 
  68.r); 
  

   maxillary 
  tooth 
  row, 
  28.9, 
  29.9, 
  29.9. 
  Average 
  of 
  7 
  adult 
  females 
  

  

  