﻿MAMMALS 
  OF 
  NORTHERN 
  COLOMBIA 
  — 
  ^HERSHKOVITZ 
  409 
  

  

  occupies 
  an 
  exclusive 
  range. 
  Marikina 
  geqffroyi 
  occurs 
  in 
  the 
  Choco 
  

   and 
  eastern 
  Panamd, 
  M. 
  oedipus 
  between 
  the 
  Rio 
  Atrato 
  and 
  the 
  

   Rio 
  Cauca-Magdalena, 
  and 
  M. 
  leucopus 
  between 
  the 
  Rios 
  Cauca 
  

   and 
  Magdalena, 
  Twenty-seven 
  specimens 
  of 
  M. 
  leucopus 
  were 
  

   taken 
  by 
  the 
  author. 
  Good 
  series 
  of 
  the 
  first 
  two 
  species 
  mentioned 
  

   were 
  secured 
  by 
  Carriker 
  in 
  1916 
  and 
  1918 
  and 
  made 
  available 
  to 
  

   the 
  writer 
  through 
  the 
  kindness 
  of 
  J. 
  K. 
  Doutt, 
  of 
  the 
  Carnegie 
  

   Museum. 
  

  

  ON 
  THE 
  CLASSIFICATION 
  OF 
  MARMOSETS 
  

  

  It 
  is 
  generally 
  agreed 
  that 
  marmosets 
  (exclusive 
  of 
  Callimico 
  (if 
  it 
  

   is 
  to 
  be 
  considered 
  a 
  marmoset)) 
  are 
  divisible 
  into 
  two 
  principal 
  

   groups. 
  One 
  group, 
  characterized 
  by 
  incisiform 
  lower 
  canines, 
  

   includes 
  Callithrix 
  (Mico) 
  and 
  Cebuella; 
  the 
  second 
  group, 
  with 
  

   normal 
  lower 
  canine-incisor 
  relationship, 
  includes 
  the 
  remaining 
  

   genera 
  of 
  Callithrichidae. 
  There 
  are 
  several 
  modern 
  publications 
  

   on 
  the 
  subject 
  of 
  characters 
  and 
  relationships 
  of 
  categories 
  compris- 
  

   ing 
  the 
  second 
  group. 
  Earliest 
  of 
  these 
  is 
  by 
  Cabrera 
  (1917b, 
  pp. 
  

   31-32). 
  After 
  a 
  brief 
  and 
  pithy 
  critique 
  of 
  the 
  nomenclature, 
  he 
  

   arranged 
  a 
  key 
  under 
  the 
  generic 
  heading 
  of 
  Leontocebus 
  Wagner, 
  

   translated 
  as 
  follows: 
  

  

  a. 
  Upper 
  lip 
  without 
  white 
  mustache. 
  

  

  b. 
  Pelage 
  of 
  head 
  forming 
  a 
  long 
  mane 
  which 
  nearly 
  completely 
  hides 
  the 
  

   ears 
  subgenus 
  Leontocebus 
  s. 
  s. 
  

  

  (Type 
  by 
  selection: 
  L. 
  chrysomelas) 
  

   h'. 
  Pelage 
  of 
  head 
  long 
  but 
  not 
  forming 
  a 
  mane, 
  the 
  ears 
  exposed. 
  

  

  subgenus 
  Tamarin 
  Gray 
  

   (Monotypic 
  type: 
  L. 
  ursulus) 
  

   a'. 
  Upper 
  lip 
  covered 
  with 
  white 
  hairs 
  forming 
  a 
  mustache. 
  

  

  subgenus 
  Mystax 
  Gray 
  

   (Type 
  by 
  tautonymy: 
  L. 
  mystax) 
  

  

  Bare-faced 
  marmosets 
  (bicolor, 
  oedipus, 
  etc.) 
  were 
  not 
  discussed 
  

   by 
  Cabrera. 
  In 
  the 
  same 
  year, 
  Pocock 
  (1917, 
  pp. 
  247-258), 
  ex- 
  

   amined 
  existing 
  classifications 
  of 
  marmosets 
  and 
  described 
  external 
  

   characters 
  of 
  the 
  principal 
  groups. 
  He 
  recognized 
  four 
  genera 
  of 
  

   marmosets. 
  After 
  separating 
  the 
  dentally 
  different 
  ^a^^aZe 
  {= 
  Calli- 
  

   thrix), 
  Pocock 
  distinguished 
  Leontocebus 
  from 
  the 
  two 
  remaining 
  genera 
  

   by 
  its 
  elongated 
  hand 
  with 
  webbing 
  between 
  the 
  three 
  middle 
  fingers. 
  

   Oedipomidas 
  was 
  separated 
  from 
  Mystax 
  by 
  the 
  form 
  of 
  its 
  ear, 
  with 
  

   lower 
  posterior 
  border 
  of 
  pinna 
  emarginate 
  or 
  obsolete. 
  Seniocebus 
  

   was 
  included 
  in 
  the 
  synonymy 
  of 
  Mystax. 
  In 
  a 
  later 
  publication, 
  

   Pocock 
  (1920, 
  pp. 
  91-113) 
  repeated 
  his 
  observations 
  on 
  external 
  

   characters 
  of 
  marmosets 
  and 
  compared 
  them 
  with 
  those 
  of 
  Cebidae. 
  

   He 
  noted 
  that 
  the 
  interdigital 
  webbing 
  in 
  Leontocebus 
  was 
  also 
  present, 
  

   but 
  to 
  a 
  lesser 
  degree, 
  in 
  an 
  individual 
  of 
  his 
  genus 
  Mystax. 
  Thomas 
  

   (1922, 
  pp. 
  197-199) 
  enlarged 
  Pocock's 
  classification 
  by 
  admitting 
  the 
  

  

  