﻿392 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  35; 
  35, 
  35, 
  36, 
  32; 
  greatest 
  length 
  of 
  skull, 
  112.9, 
  107.4, 
  111.7; 
  102.4, 
  

   98.4, 
  102.6, 
  104.5; 
  condylobasal 
  length, 
  107.4, 
  98.4, 
  105.8; 
  95.8, 
  88.4, 
  

   97.0, 
  93.0; 
  zygomatic 
  breadth, 
  — 
  , 
  69.5, 
  74.4; 
  67.9, 
  64.4, 
  65.6, 
  65.2; 
  

   length 
  of 
  braui 
  case, 
  74.7, 
  71.5, 
  69.1; 
  66.0, 
  65.6, 
  67.5, 
  69.6; 
  mastoidal 
  

   width 
  of 
  bram 
  case, 
  56.5, 
  51.8, 
  55.5; 
  52.3, 
  48.7, 
  50.4, 
  49.5; 
  greatest 
  

   width 
  across 
  maxillary 
  tooth 
  rows, 
  — 
  , 
  39.1, 
  37.4; 
  35.1, 
  33.3, 
  35.3, 
  35.7; 
  

   length 
  of 
  maxillary 
  tooth 
  row, 
  42.1, 
  42.3, 
  41.0; 
  40.0, 
  36.9, 
  36.2, 
  39.6 
  

   mm. 
  

  

  Las 
  Marimondas, 
  Sierra 
  de 
  Perijd 
  (5 
  males, 
  1 
  immature; 
  2 
  females): 
  

   Like 
  those 
  from 
  La 
  Gloria, 
  San 
  Pedro, 
  and 
  Cienaga 
  deGuajaro 
  except 
  

   pelage 
  longer 
  and 
  more 
  lustrous, 
  lateral 
  fringe 
  and 
  extremities, 
  

   especially 
  tail, 
  slightly 
  darker. 
  

  

  Measurements. 
  — 
  Those 
  of 
  4 
  males 
  and 
  2 
  females, 
  respectively: 
  Head 
  

   and 
  body, 
  548, 
  574, 
  534, 
  540; 
  481, 
  509; 
  tail, 
  629, 
  619, 
  598, 
  604 
  (bob); 
  

   605, 
  654; 
  hind 
  foot, 
  154, 
  155, 
  142, 
  154; 
  131, 
  143; 
  ear, 
  35, 
  36, 
  38, 
  39; 
  

   35, 
  36; 
  greatest 
  length 
  of 
  skull, 
  116.2, 
  121.7, 
  117.3, 
  127.5; 
  107.5, 
  107.5; 
  

   condylobasal 
  length, 
  109.2, 
  112.6, 
  110.9, 
  120.3; 
  97.9, 
  97.6; 
  zygomatic 
  

   breadth, 
  74.7, 
  80.2, 
  78.2, 
  83.9; 
  67.2, 
  68.9; 
  length 
  of 
  bram 
  case, 
  70.6, 
  

   76.8, 
  73.1, 
  79.1; 
  69.6, 
  70.6; 
  mastoidal 
  width 
  of 
  brain 
  case, 
  55.9, 
  60.0, 
  

   54.3, 
  62.2; 
  50.1, 
  51.8; 
  greatest 
  width 
  across 
  maxillary 
  tooth 
  rows, 
  

   40.2, 
  41.5, 
  39.6, 
  47.7; 
  36.5, 
  37.1; 
  length 
  of 
  maxillary 
  tooth 
  row, 
  41.5, 
  

   45.0, 
  41.5, 
  43.7; 
  39.7, 
  38.9 
  mm. 
  

  

  Remarks, 
  — 
  Cranial 
  measurements 
  of 
  another 
  howler 
  from 
  the 
  Sierra 
  

   Negra, 
  south 
  of 
  Las 
  Marimondas 
  and 
  above 
  the 
  town 
  of 
  Villanueva 
  

   are 
  roughly 
  intermediate 
  between 
  those 
  of 
  the 
  two 
  largest 
  males 
  of 
  

   the 
  above 
  series. 
  

  

  Rio 
  Tarra 
  (3 
  males, 
  1 
  female) 
  : 
  Like 
  the 
  Las 
  Marimondas 
  series 
  but 
  

   pelage 
  glossier, 
  extremities 
  slightly 
  darker. 
  

  

  Measurements. 
  — 
  Those 
  of 
  3 
  males 
  and 
  1 
  female, 
  respectively: 
  Head 
  

   and 
  body, 
  538, 
  565, 
  606; 
  537; 
  tail, 
  748, 
  705, 
  643; 
  673; 
  hind 
  foot, 
  171, 
  

   162, 
  152; 
  157; 
  ear, 
  39, 
  39, 
  37; 
  34; 
  greatest 
  length 
  of 
  skull, 
  124.8, 
  126.3, 
  

   130.7; 
  — 
  ; 
  condylobasal 
  length, 
  113.3, 
  118.3, 
  122.5; 
  104.3; 
  zygomatic 
  

   breadth, 
  76.5, 
  84.9, 
  80.6; 
  66.6; 
  length 
  of 
  brain 
  case, 
  81.2, 
  81.6, 
  83.5; 
  

   72.3; 
  mastoidal 
  width 
  of 
  brain 
  case, 
  57.8, 
  57.9, 
  59.6; 
  52.8; 
  greatest 
  

   width 
  across 
  maxillary 
  tooth 
  rows, 
  44.0, 
  42.8, 
  41.0; 
  35.7; 
  length 
  of 
  

   maxillary 
  tooth 
  row, 
  44.5, 
  43.5, 
  43.5; 
  — 
  mm. 
  

  

  Remarks. 
  — 
  These 
  howlers 
  are 
  by 
  far 
  the 
  largest 
  of 
  the 
  collection. 
  

   The 
  series 
  from 
  Las 
  Marimondas, 
  in 
  the 
  same 
  general 
  region, 
  averages 
  

   slightly 
  smaller. 
  Both 
  series 
  are 
  the 
  only 
  ones 
  taken 
  in 
  humid 
  virgin 
  

   forest. 
  The 
  others 
  are 
  from 
  secondary 
  forests 
  in 
  humid 
  or 
  semiarid 
  

   climates. 
  The 
  Villanueva 
  and 
  Cienaga 
  de 
  Gudjaro 
  regions 
  are 
  semi- 
  

   arid 
  and 
  largely 
  savanna 
  with 
  isolated 
  stands 
  of 
  scrub 
  forests 
  marked 
  

   by 
  relatively 
  few 
  tall 
  trees. 
  Apparently, 
  conditions 
  in 
  humid 
  virgin 
  

   forests 
  are 
  optimum 
  for 
  maximum 
  growth 
  and 
  development 
  of 
  howlers. 
  

   Of 
  some 
  taxonomic 
  interest 
  is 
  the 
  tendency 
  for 
  the 
  Las 
  Marimondas 
  

  

  