﻿MAMMALS 
  OF 
  NORTHERN 
  COLOMBIA 
  — 
  ^HERSHKOVITZ 
  353 
  

  

  from 
  alveolar 
  rim 
  or 
  more 
  than 
  two 
  and 
  one-half 
  times 
  the 
  correspond- 
  

   ing 
  length 
  of 
  the 
  first 
  premolar; 
  in 
  females 
  the 
  upper 
  canine 
  projects 
  

   10 
  mm. 
  or 
  less 
  and 
  is 
  less 
  than 
  twice 
  the 
  corresponding 
  length 
  of 
  the 
  

   adjacent 
  premolar. 
  

  

  Externally, 
  partial 
  dimorphism 
  distinguishes 
  many 
  individuals 
  of 
  

   one 
  sex 
  from 
  the 
  other. 
  A 
  majority 
  of 
  females 
  depart 
  from 
  the 
  

   normal 
  condition 
  of 
  a 
  broad, 
  pale 
  superciliary 
  band 
  consisting 
  of 
  

   short, 
  smootlily 
  adpressed 
  hairs. 
  In 
  these 
  females 
  a 
  few 
  to 
  all 
  hairs 
  

   of 
  forehead 
  are 
  comparatively 
  long 
  and 
  erected 
  in 
  the 
  form 
  of 
  a 
  super- 
  

   ciliary 
  tuft 
  or 
  frontal 
  diadem 
  (fig. 
  52, 
  6), 
  Color 
  of 
  these 
  hairs 
  may 
  

   be 
  whitish 
  to 
  brown 
  like 
  cap. 
  A 
  dark 
  forehead 
  without 
  tufts 
  is 
  noted 
  

   in 
  a 
  few 
  females. 
  No 
  exception 
  to 
  the 
  condition 
  of 
  forehead 
  described 
  

   as 
  normal 
  has 
  been 
  noted 
  among 
  males. 
  Generally, 
  color 
  of 
  upper 
  

   surface 
  of 
  tail 
  is 
  a 
  continuation 
  of 
  that 
  of 
  median 
  dorsal 
  area 
  where 
  

   individual 
  hairs 
  are 
  not 
  banded 
  terminally 
  and 
  subterminally 
  with 
  

   markedly 
  contrasting 
  colors. 
  In 
  a 
  large 
  percentage 
  of 
  males, 
  terminal 
  

   portions 
  of 
  hairs 
  of 
  upper 
  smface 
  of 
  tail 
  are 
  huffy 
  or 
  pale 
  yellowish 
  and 
  

   contrast 
  sharply 
  with 
  the 
  dark 
  brown 
  or 
  reddish 
  subterminal 
  bands. 
  

   This 
  effects 
  a 
  "hoar-frosted" 
  appearance 
  on 
  surface 
  of 
  tail. 
  Tails 
  of 
  

   females 
  do 
  not 
  exhibit 
  definite 
  hoar-frosting. 
  

  

  In 
  the 
  following 
  tabidation 
  the 
  number 
  of 
  individuals 
  with 
  each 
  

   of 
  the 
  various 
  aspects 
  of 
  forehead 
  and 
  tail 
  are 
  summarized. 
  Only 
  

   specimens 
  captured 
  in 
  the 
  field 
  are 
  listed. 
  

  

  Males, 
  normal 
  33 
  

  

  Males, 
  with 
  hoar-frosted 
  tails 
  22 
  

  

  Females, 
  normal, 
  with 
  broad, 
  pale 
  superciliary 
  band 
  17 
  

  

  Females, 
  with 
  white 
  frontal 
  tufts 
  9 
  

  

  Females, 
  with 
  brown 
  frontal 
  tufts 
  14 
  

  

  Females, 
  with 
  brown 
  untufted 
  foreheads 
  2 
  

  

  No 
  sharp 
  line 
  divides 
  the 
  four 
  categories 
  of 
  females. 
  The 
  number 
  

   given 
  for 
  normal 
  females 
  includes 
  all 
  those 
  with 
  foreheads 
  as 
  in 
  males 
  

   plus 
  a 
  number 
  with 
  incipient 
  tufts 
  and 
  pale 
  tones 
  of 
  brown. 
  There 
  is 
  

   a 
  gradual 
  transition 
  from 
  white 
  to 
  brown 
  tufted 
  females. 
  Pelage 
  of 
  

   forehead 
  of 
  the 
  two 
  brown 
  untufted 
  females 
  is 
  long 
  and 
  lax 
  and 
  may 
  

   be 
  erectile. 
  Similarly, 
  normal 
  males 
  grade 
  into 
  those 
  with 
  hoar- 
  

   frosted 
  tails. 
  Males 
  with 
  questionably 
  hoar-frosted 
  tails 
  have 
  been 
  

   listed 
  as 
  normal. 
  

  

  Superciliary 
  tufts 
  or 
  frontal 
  diadems 
  appear 
  also 
  in 
  many 
  females 
  

   of 
  C. 
  capucinus 
  and 
  C. 
  nigrivittatus. 
  Tufts 
  of 
  "untufted" 
  species 
  of 
  

   Cebus 
  consist 
  of 
  erect 
  hairs 
  of 
  the 
  superciliary 
  region 
  usually 
  restricted 
  

   to 
  the 
  forehead 
  but 
  sometimes 
  extending 
  for 
  a 
  very 
  short 
  distance 
  

   over 
  part 
  of 
  crown. 
  In 
  the 
  latter 
  case, 
  a 
  distinctly 
  darker 
  cap 
  is 
  

   usually 
  absent. 
  In 
  true 
  "tufted" 
  species 
  (C. 
  apella) 
  tufts 
  are 
  normally 
  

   erect 
  hairs 
  of 
  the 
  coronal 
  cap, 
  not 
  of 
  the 
  superciliary 
  band. 
  

  

  Dental 
  anomalies. 
  — 
  In 
  material 
  examined, 
  two 
  males 
  and 
  one 
  female 
  

  

  