﻿MAMMALS 
  OF 
  NORTHERN 
  COLOMBIA 
  — 
  HERSHKOVITZ 
  383 
  

  

  face 
  black, 
  long 
  white 
  to 
  buffy 
  hairs 
  of 
  cheek 
  directed 
  dorsoposteriad; 
  

   gray 
  to 
  buffy 
  circumlabial 
  hairs 
  short 
  and 
  sparse; 
  dark 
  brown 
  super- 
  

   ciliary 
  hairs 
  long 
  and 
  erect; 
  conspicuous, 
  triangular-shaped 
  frontal 
  

   patch 
  white 
  to 
  buffy, 
  the 
  long 
  hairs 
  directed 
  forward 
  and 
  converging 
  

   toward 
  the 
  median 
  line 
  to 
  form 
  a 
  ridge. 
  Crown 
  Snuff 
  Brown 
  to 
  

   Bister, 
  the 
  hairs 
  directed 
  forward 
  and 
  overlapping 
  frontal 
  patch. 
  

   Nape 
  like 
  crown 
  or 
  slightly 
  paler, 
  the 
  hairs 
  directed 
  forward 
  ; 
  scapular 
  

   region 
  paler, 
  from 
  Snuff 
  Brown 
  to 
  Cinnamon-Buff; 
  the 
  hairs 
  forming 
  a 
  

   whorl; 
  back 
  becoming 
  progressively 
  paler 
  posteriorward, 
  to 
  Pinkish 
  

   Buff 
  or 
  Light 
  Buff 
  in 
  palest 
  individuals. 
  Lateral 
  fringe 
  like 
  back. 
  

   Chest, 
  belly, 
  inner 
  side 
  of 
  thigh 
  and 
  ventral 
  surface 
  of 
  tail, 
  except 
  

   naked 
  terminal 
  one-fourth, 
  sharply 
  defined 
  silvery 
  or 
  buffy, 
  the 
  dark 
  

   brown 
  skin 
  showing 
  through. 
  Forelimb 
  dark 
  brown 
  like 
  nape 
  or 
  

   crown, 
  the 
  inner 
  side 
  pale, 
  like 
  chest; 
  outer 
  side 
  of 
  thigh 
  hke 
  forelimb, 
  

   contrasting 
  with 
  pale 
  lower 
  part 
  of 
  back 
  and 
  rump; 
  dark 
  brown 
  of 
  

   thigh 
  extending 
  on 
  outer 
  side 
  of 
  leg 
  as 
  a 
  band 
  bordered 
  by 
  buffy 
  hairs. 
  

   Upper 
  surface 
  of 
  tail 
  brown 
  like 
  back, 
  or 
  darker, 
  with 
  terminal 
  one- 
  

   fourth 
  usually 
  darker 
  than 
  anterior 
  portion. 
  

  

  Rio 
  San 
  Pedro, 
  Norosi 
  (one 
  adult 
  female) 
  : 
  Darkest 
  specimen 
  of 
  the 
  

   collection 
  with 
  head 
  and 
  forelimbs 
  almost 
  black; 
  most 
  nearly 
  

   approached 
  in 
  color 
  by 
  a 
  large 
  male 
  of 
  the 
  Rio 
  Cesar 
  series. 
  This 
  

   heavily 
  pigmented 
  female 
  may 
  represent 
  a 
  dark 
  race 
  isolated 
  from 
  

   the 
  typical 
  population 
  on 
  opposite 
  side 
  of 
  the 
  Rio 
  Magdalena. 
  

  

  Las 
  Marimondas 
  (2 
  males, 
  6 
  females) 
  : 
  Like 
  the 
  Rio 
  Cesar 
  series 
  but 
  

   shghtly 
  more 
  uniformly 
  brown. 
  One 
  immature, 
  combined 
  head 
  and 
  

   body 
  length, 
  188 
  mm., 
  is 
  thinly 
  haired 
  dirty 
  gray 
  on 
  upperparts. 
  

   Another 
  immature, 
  head 
  and 
  body, 
  226 
  mm., 
  is 
  colored 
  like 
  adults 
  but 
  

   with 
  the 
  buffy 
  juvenile 
  pelage 
  still 
  evident. 
  Frontal 
  patch 
  is 
  not 
  

   defined 
  in 
  either 
  juvenal. 
  

  

  Remarks. 
  — 
  The 
  name 
  Las 
  Marimondas 
  was 
  given 
  by 
  natives 
  to 
  this 
  

   locality 
  in 
  the 
  Sierra 
  de 
  Perija 
  because 
  of 
  the 
  abundance 
  of 
  spider 
  

   monkeys, 
  or 
  marimondas, 
  there. 
  Few 
  bands 
  of 
  Ateles 
  still 
  remain 
  on 
  

   the 
  western 
  slope 
  of 
  the 
  whole 
  range. 
  Deforestation 
  and 
  persecution 
  

   by 
  man 
  forced 
  spider 
  monkeys 
  to 
  retreat 
  to 
  the 
  summits 
  and 
  eastern 
  

   slopes 
  of 
  the 
  Sierra 
  de 
  Perijd. 
  Individuals 
  of 
  the 
  present 
  series 
  were 
  

   taken 
  on 
  the 
  westei*n 
  slope, 
  in 
  the 
  Rfo 
  Rancheria 
  drainage 
  system, 
  

   and 
  on 
  the 
  eastern, 
  or 
  Venezuelan 
  slope, 
  in 
  the 
  Lake 
  Maracaibo 
  

   system. 
  

  

  Rio 
  Tarra 
  (2 
  males, 
  7 
  females) 
  : 
  Like 
  the 
  Cesar 
  series 
  but 
  more 
  

   uniformly 
  colored, 
  less 
  variable 
  individually; 
  average 
  size 
  larger. 
  

  

  Remarks. 
  — 
  Five 
  specimens 
  were 
  taken 
  at 
  Bella 
  Vista, 
  altitude 
  400 
  

   meters, 
  on 
  heights 
  overlooking 
  the 
  author's 
  Tarra 
  camp; 
  the 
  remaining 
  

   four 
  in 
  the 
  Rio 
  Tarra 
  Valley 
  at 
  an 
  altitude 
  of 
  about 
  200 
  meters 
  above 
  

   sea 
  level. 
  The 
  Rio 
  Tarra 
  of 
  these 
  spider 
  monkeys 
  is 
  not 
  the 
  same 
  as 
  

  

  