﻿390 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  (Sciurus 
  variabilis, 
  Ateles 
  hyhridus, 
  Cebus 
  albijrons 
  pleei) 
  agree 
  with 
  

   the 
  fauna 
  of 
  the 
  lower 
  Rio 
  Magdalena, 
  and 
  Alouatta 
  chrysurus 
  can 
  

   likewise 
  be 
  matched 
  with 
  present 
  specimens 
  of 
  howlers 
  from 
  La 
  Gloria 
  

   and 
  Rio 
  San 
  Pedro, 
  Norosi. 
  The 
  araguato 
  of 
  Venezuela, 
  described 
  

   by 
  Humboldt 
  as 
  ursina 
  {=arctoidea 
  Cabrera), 
  is 
  a 
  darker 
  race. 
  

   GeofFroy 
  himself 
  believed 
  the 
  true 
  habitat 
  of 
  chrysurus 
  to 
  be 
  the 
  

   Magdalena 
  Valley 
  of 
  Colombia. 
  Original 
  distinction 
  of 
  chrysurus 
  

   from 
  seniculus 
  was 
  based 
  on 
  comparisons 
  with 
  Guianan 
  specimens 
  

   supposed 
  to 
  be 
  representative 
  of 
  typical 
  seniculus. 
  The 
  colored 
  figure 
  

   of 
  chrysurus 
  (op. 
  cit.) 
  may 
  be 
  identified 
  as 
  that 
  of 
  a 
  red 
  howler 
  but 
  

   otherwise 
  has 
  little 
  resemblance 
  to 
  the 
  actual 
  specimens 
  it 
  is 
  supposed 
  

   to 
  depict. 
  

  

  Bonda 
  (4 
  males, 
  2 
  females): 
  The 
  males 
  similar 
  to 
  the 
  Cienaga 
  de 
  

   Guajaro 
  series, 
  but 
  two 
  with 
  darker 
  rumps, 
  two 
  with 
  paler 
  rumps; 
  

   females 
  in 
  pale 
  phase, 
  dark 
  tipping 
  of 
  hairs 
  of 
  back 
  greatly 
  reduced, 
  

   terminal 
  halves 
  of 
  hairs 
  like 
  subterminal 
  portions 
  of 
  hairs 
  of 
  backs 
  of 
  

   males, 
  tail 
  also 
  paler 
  for 
  greater 
  length. 
  

  

  Measurements. 
  — 
  Those 
  of 
  an 
  adult 
  male 
  and 
  female, 
  respectively, 
  

   external 
  measurements 
  not 
  available: 
  Greatest 
  length 
  of 
  skull, 
  128.3, 
  

   109.4; 
  condylobasal 
  length, 
  122.5, 
  98.1; 
  zygomatic 
  breadth, 
  84.6, 
  68.9; 
  

   length 
  of 
  brain 
  case, 
  80.0, 
  71.4; 
  mastoidal 
  width 
  of 
  brain 
  case, 
  63.3, 
  

   52.7; 
  greatest 
  width 
  across 
  maxillary 
  tooth 
  rows, 
  44.1, 
  37.8; 
  length 
  of 
  

   maxillary 
  tooth 
  row, 
  43.5, 
  39.3 
  mm. 
  

  

  Remarks. 
  — 
  These 
  are 
  topotypes 
  of 
  rubicunda 
  Allen, 
  collected 
  by 
  

   Mrs. 
  H. 
  H. 
  Smith. 
  As 
  in 
  the 
  case 
  of 
  chrysurus, 
  separation 
  of 
  rubicunda 
  

   from 
  true 
  seniculus 
  was 
  predicated 
  on 
  the 
  assumption 
  that 
  the 
  type 
  

   locality 
  of 
  the 
  latter 
  was 
  in 
  the 
  Guianas. 
  Later, 
  in 
  his 
  description 
  of 
  

   bogotensis, 
  Allen 
  {op. 
  cit.) 
  affirmed 
  it 
  to 
  be 
  Cartagena, 
  Colombia. 
  The 
  

   first 
  account 
  of 
  rubicunda 
  deals 
  lengthily 
  with 
  the 
  considerable 
  amount 
  

   of 
  individual 
  variation 
  noted 
  among 
  the 
  84 
  specimens 
  of 
  the 
  type 
  

   series. 
  

  

  Colonia 
  Agricola 
  de 
  Caracolicito 
  (2 
  males, 
  1 
  immature; 
  2 
  females, 
  

   1 
  immature): 
  Adult 
  male 
  in 
  pale 
  phase, 
  adult 
  female 
  slightly 
  darker, 
  

   with 
  more 
  dark-tipped 
  hairs 
  on 
  back. 
  Immatiu'e 
  female 
  with 
  basal 
  

   portions 
  of 
  hairs 
  of 
  dorsal 
  surface 
  except 
  rump, 
  nearly 
  black, 
  hairs 
  of 
  

   face 
  and 
  chin 
  darker 
  than 
  usual, 
  arms 
  with 
  a 
  blackish 
  lateral 
  line. 
  

   Immatiu-e 
  male 
  smaller 
  than 
  the 
  female, 
  paler 
  throughout 
  but 
  basal 
  

   portions 
  of 
  hairs 
  of 
  back 
  still 
  darker 
  than 
  in 
  adults. 
  

  

  Measurements.— 
  'T\\o^e, 
  of 
  an 
  adult 
  male 
  and 
  female, 
  respectively: 
  

   Head 
  and 
  body, 
  581, 
  505; 
  tail, 
  674, 
  645; 
  hind 
  foot, 
  155, 
  142; 
  ear, 
  39, 
  36; 
  

   greatest 
  length 
  of 
  skull, 
  125.9, 
  106.2; 
  condylobasal 
  length, 
  113.3, 
  95.7; 
  

   zygomatic 
  breadth, 
  78.3, 
  65.3; 
  length 
  of 
  brain 
  case, 
  79.8, 
  67.5; 
  mas- 
  

   toidal 
  width 
  of 
  brain 
  case, 
  58.0, 
  49.0; 
  gi-eatest 
  width 
  across 
  maxillary 
  

   tooth 
  rows, 
  39.6, 
  35.1; 
  length 
  of 
  maxillary 
  tooth 
  row, 
  41.1, 
  37.9 
  mm. 
  

  

  