﻿MAMMALS 
  OF 
  NORTHERN 
  COLOMBIA 
  — 
  ^HERSHKOVITZ 
  327 
  

  

  region 
  and 
  of 
  same 
  general 
  coloration 
  as 
  topknot 
  or 
  transverse 
  ridge; 
  never 
  in 
  

   rest 
  of 
  forehead. 
  (Fig. 
  52, 
  h.) 
  form 
  of 
  thin 
  superciliary 
  brush 
  or 
  

  

  diadem; 
  color 
  of 
  hairs 
  of 
  tufts, 
  at 
  least 
  

   terminally, 
  like 
  coronal 
  cap 
  and 
  con- 
  

   trasting 
  with 
  pale 
  superciliary 
  band, 
  if 
  

   present. 
  (Fig. 
  52, 
  e, 
  /.) 
  

  

  2. 
  Cap 
  of 
  crown, 
  in 
  males 
  and 
  2. 
  Cap 
  of 
  crown 
  always 
  broad, 
  never 
  

   untufted 
  females, 
  broad 
  or 
  narrow, 
  acutely 
  pointed 
  or 
  wedge-shaped 
  in 
  

   rounded 
  in 
  front 
  or 
  pointed, 
  greatest 
  front, 
  greatest 
  width 
  nearly 
  equal 
  to 
  

   width 
  from 
  one-third 
  to 
  nearly 
  total 
  distance 
  between 
  ears. 
  A 
  midfrontal 
  

   distance 
  between 
  ears. 
  A 
  midfrontal 
  wedge, 
  never 
  a 
  hne, 
  of 
  dark 
  hairs 
  to 
  root 
  

   line 
  or 
  wedge 
  of 
  dark 
  hairs 
  to 
  root 
  of 
  of 
  nose 
  often 
  present. 
  (Fig. 
  52, 
  e, 
  /.) 
  

   nose 
  present 
  or 
  absent. 
  (Fig. 
  52, 
  a, 
  c, 
  d.) 
  

  

  3. 
  Dark 
  preauricular 
  band 
  absent; 
  3. 
  A 
  contrastingly 
  dark 
  preauricular 
  

   sides 
  of 
  face, 
  chin, 
  throat 
  whitish 
  to 
  band 
  on 
  each 
  side 
  of 
  face 
  usually 
  

   brown, 
  rarely 
  with 
  darker 
  streaks 
  on 
  present; 
  the 
  bands 
  normally 
  extending 
  

   cheeks. 
  (Fig. 
  52, 
  a-d.) 
  from 
  cap 
  to 
  under 
  chin 
  where 
  they 
  may 
  

  

  unite. 
  (Fig. 
  52, 
  e, 
  /.) 
  

  

  Number 
  of 
  lumbar 
  vertebrae 
  has 
  often 
  been 
  cited 
  as 
  distinctive 
  for 
  

   each 
  group 
  or, 
  at 
  least, 
  for 
  certain 
  species 
  of 
  each 
  group. 
  Members 
  

   of 
  the 
  "tufted" 
  group 
  are 
  said 
  to 
  have 
  five 
  lumbar 
  vertebrae, 
  and 
  six 
  

   are 
  attributed 
  to 
  the 
  "untufted" 
  species. 
  The 
  following 
  number 
  of 
  

   vertebrae 
  have 
  been 
  noted 
  in 
  each 
  of 
  the 
  available 
  skeletons 
  in 
  the 
  

   United 
  States 
  National 
  Museum 
  collection: 
  

  

  "Tufted" 
  (C. 
  apella, 
  Matto 
  Grosso, 
  Brazil) 
  

  

  Apparently 
  the 
  difference 
  between 
  "tufted" 
  and 
  "untufted" 
  species 
  

   lies 
  in 
  the 
  number 
  of 
  thoracic 
  vertebrae. 
  However, 
  too 
  few 
  specimens 
  

   have 
  been 
  examined 
  for 
  affirming 
  any 
  real 
  difference 
  between 
  the 
  

   gi'oups 
  on 
  the 
  score 
  of 
  number 
  of 
  precaudal 
  vertebrae. 
  So 
  far 
  it 
  can 
  

   be 
  said 
  that 
  total 
  of 
  combined 
  number 
  of 
  thoracic, 
  lumbar, 
  and 
  sacral 
  

   vertebrae 
  is 
  22 
  or 
  23 
  in 
  "untufted," 
  and 
  21 
  in 
  "tufted" 
  cebids. 
  

  

  COMPARISONS 
  OF 
  CEBUS 
  ALBIFRONS 
  AND 
  CEBUS 
  NIGRIVITTATUS 
  

  

  Among 
  "untufted" 
  cebids, 
  the 
  black 
  white-fronted 
  Cebus 
  capucinus 
  

   of 
  Central 
  America, 
  western 
  Colombia, 
  and 
  western 
  Ecuador 
  is 
  readily 
  

   distinguished 
  from 
  all 
  others. 
  In 
  color 
  pattern 
  of 
  body, 
  "untufted" 
  

  

  