﻿366 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  Distribution. 
  — 
  Western 
  slope 
  of 
  Cordillera 
  Oriental, 
  department 
  of 
  

   Santander, 
  east 
  through 
  low 
  passes 
  to 
  the 
  Rio 
  Zulia-Rio 
  Catatumbo 
  

   drainage 
  basin, 
  department 
  of 
  Norte 
  de 
  Santander, 
  Colombia, 
  and 
  

   state 
  of 
  Zulia, 
  Venezuela. 
  

  

  Character. 
  — 
  Darkest 
  race 
  of 
  albifrons. 
  Cap 
  Cinnamon-Brown 
  to 
  

   Bister; 
  median 
  dorsal 
  region 
  Cinnamon-Brown 
  mixed 
  with 
  Tawny, 
  

   forearm 
  and 
  foreleg 
  Sanford's 
  Brown 
  to 
  Russet 
  or 
  Bay, 
  moderately 
  

   contrasted 
  with 
  back 
  and 
  sides; 
  hairs 
  of 
  belly 
  and 
  chest 
  from 
  nearly 
  

   uniformly 
  buffy 
  to 
  nearly 
  uniformly 
  Mars 
  Orange; 
  pale 
  area 
  of 
  front 
  

   not 
  extending 
  over 
  upper 
  surface 
  of 
  shoulder, 
  reduced 
  or 
  obsolete 
  on 
  

   front 
  of 
  shoulder. 
  

  

  Coloration 
  of 
  adult 
  male 
  topotype. 
  — 
  Cap 
  Bister, 
  nape 
  Front's 
  Brown; 
  

   median 
  dorsal 
  region 
  Cinnamon-Brown 
  with 
  a 
  slight 
  Tawny 
  tinge 
  

   anteriorly, 
  becoming 
  Russet 
  posteriorly, 
  sides 
  paler 
  becoming 
  Snuff 
  

   Brown 
  on 
  lateral 
  fringe. 
  Buffy 
  shoulder 
  patch 
  nearly 
  obsolete 
  in 
  

   front; 
  upper 
  side 
  of 
  shoulder 
  and 
  lateral 
  surface 
  of 
  upper 
  arm 
  Cinna- 
  

   mon-Brown; 
  outer 
  side 
  of 
  upper 
  arm 
  and 
  inner 
  side 
  of 
  forearm 
  

   Sanford's 
  Brown; 
  outer 
  side 
  of 
  forearm 
  approximately 
  Burnt 
  Sienna, 
  

   posterior 
  side 
  darker 
  grading 
  into 
  Auburn 
  of 
  WTist 
  and 
  upper 
  surface 
  

   of 
  hand; 
  hairs 
  of 
  fingers 
  mixed 
  Aubm-n 
  and 
  buffy. 
  Lateral 
  surface 
  

   of 
  thigh 
  Cinnamon-Brown, 
  front 
  of 
  thigh 
  and 
  foreleg 
  Burnt 
  Sienna 
  

   becoming 
  Auburn 
  on 
  ankle 
  and 
  top 
  of 
  foot; 
  hairs 
  of 
  toes 
  blackish. 
  

   Hairs 
  of 
  beUy 
  and 
  lower 
  part 
  of 
  chest 
  Burnt 
  Sienna 
  becoming 
  Orange- 
  

   Rufous 
  on 
  upper 
  part 
  of 
  chest 
  and 
  inner 
  side 
  of 
  upper 
  arm. 
  Tail 
  

   above 
  Cinnamon-Brown 
  proximally, 
  becoming 
  slightly 
  paler 
  terminally, 
  

   underside 
  Cinnamon-Brown 
  but 
  hairs 
  with 
  longer 
  buffy 
  basal 
  por- 
  

   tions 
  than 
  above, 
  terminally 
  the 
  hairs 
  becoming 
  increasingly 
  buffy. 
  

  

  An 
  immature 
  male 
  topotype 
  with 
  milk 
  premolars 
  and 
  uncut 
  third 
  

   molar 
  is 
  approximately 
  a 
  tone 
  paler 
  throughout 
  than 
  the 
  adult 
  male. 
  

  

  Measurements. 
  — 
  Of 
  the 
  adult 
  male 
  topotype: 
  Head 
  and 
  body, 
  407; 
  

   tail, 
  499; 
  hind 
  foot, 
  132; 
  greatest 
  length 
  of 
  skull, 
  99.1; 
  condylobasal 
  

   length, 
  76.7; 
  zygomatic 
  breadth, 
  63.1 
  ; 
  width 
  of 
  brain 
  case, 
  51.6; 
  length 
  

   of 
  brain 
  case, 
  78.0; 
  orbital 
  breadth, 
  51.0; 
  greatest 
  width 
  across 
  maxU- 
  

   lary 
  tooth 
  rows, 
  29.5; 
  length, 
  upper 
  canine 
  to 
  M^, 
  28.3; 
  length, 
  lower 
  

   canine 
  to 
  M3, 
  30.9; 
  mandibular 
  depth 
  at 
  condyle, 
  30.5 
  mm. 
  

  

  Bella 
  Vista, 
  Rio 
  Tarra, 
  Norte 
  de 
  Santander, 
  altitude 
  500 
  meters 
  (1 
  

   adult 
  male) 
  : 
  Cap 
  Front's 
  Brown 
  with 
  a 
  mixtm-e 
  of 
  black-tipped 
  hairs; 
  

   streaks 
  of 
  long, 
  brownish-tipped 
  hairs 
  on 
  front 
  and 
  side 
  of 
  face; 
  hairs 
  

   of 
  median 
  dorsal 
  region 
  Cinnamon-Brown 
  to 
  Front's 
  Brown 
  subtermi- 
  

   nally, 
  Ochraceous-Tawny 
  terminally, 
  the 
  whole 
  appearing 
  as 
  a 
  fine 
  

   mixture 
  of 
  both 
  colors, 
  the 
  darker 
  dominating 
  anteriorly, 
  the 
  paler 
  

   posteriorly; 
  side 
  of 
  body 
  and 
  lateral 
  fringe 
  Front's 
  Brown. 
  Upper 
  

   surface 
  of 
  shoulder 
  and 
  lateral 
  surface 
  of 
  upper 
  arm 
  Sanford's 
  Brown 
  

   grading 
  into 
  nearly 
  Auburn 
  of 
  forearm 
  and 
  upper 
  surface 
  of 
  hand; 
  

  

  