﻿346 
  Mr. 
  O. 
  Thomas 
  oti 
  

  

  I'liis 
  is 
  tlie 
  first 
  example 
  of 
  CaUimico 
  of 
  wliich 
  the 
  locality 
  

   is 
  known, 
  the 
  two 
  previous 
  examples 
  having 
  both 
  been 
  

   received 
  at 
  the 
  Para 
  Zoological 
  Gardens 
  without 
  any 
  indica- 
  

   tion 
  of 
  their 
  original 
  home. 
  

  

  The 
  milk-preniolars 
  are 
  still 
  in 
  ])lace, 
  but 
  the 
  characteristic 
  

   third 
  molar 
  (absent 
  in 
  all 
  marmosets) 
  is 
  visible 
  below 
  the 
  

   level 
  of 
  the 
  bone. 
  

  

  On 
  Marmosets 
  allied 
  lo 
  Leontocebus 
  devillei. 
  

  

  We 
  have 
  received 
  from 
  the 
  Para 
  Museum 
  a 
  marmoset 
  

   from 
  the 
  Upper 
  Rio 
  Purus 
  allied 
  to 
  L. 
  devillei^ 
  and, 
  on 
  ex- 
  

   amining 
  our 
  seiies 
  of 
  this 
  group, 
  I 
  find 
  three 
  species 
  repre- 
  

   sented 
  — 
  apart 
  altogether 
  from 
  the 
  buft'y-htaded 
  fuscicollis, 
  

   the 
  chestnut 
  and 
  butfy 
  mantled 
  illicjeri, 
  apiculatus, 
  &c., 
  and 
  

   the 
  very 
  different 
  7iigricollis, 
  which 
  is 
  without 
  the 
  dorsal 
  

   niarblings. 
  

  

  Of 
  those 
  which 
  have 
  dark 
  head 
  and 
  mantle 
  and 
  strong 
  

   dorsal 
  marbling 
  the 
  species 
  may 
  be 
  divided 
  as 
  follows 
  :■ 
  — 
  

  

  A. 
  Dark 
  on 
  underside 
  extending 
  only 
  to 
  cliest, 
  the 
  whole 
  of 
  belly 
  more 
  

  

  or 
  less 
  ferruginous. 
  Dorsal 
  marbling 
  grej^, 
  scarcely 
  sufliised 
  with 
  

   bufly. 
  An 
  olive 
  or 
  brownish 
  patch 
  over 
  the 
  kuee, 
  in 
  the 
  rulbusarea. 
  

   Rufous 
  on 
  tail 
  only 
  quite 
  at 
  its 
  base 
  

  

  a. 
  Mantle 
  and 
  upper 
  arms 
  obscure 
  rufous 
  or 
  brown. 
  

  

  L. 
  devillei, 
  I. 
  Geoff. 
  Syn. 
  M. 
  leucngenys, 
  Gray 
  *. 
  

  

  An 
  adult 
  specimen 
  from 
  liio 
  Pereue, 
  Peru, 
  and 
  the 
  young 
  

   type 
  of 
  leucugenys. 
  

  

  b. 
  Mantle 
  and 
  upper 
  arms 
  glossy 
  black, 
  like 
  the 
  feet 
  and 
  tail. 
  A 
  large 
  

  

  blackish-brown 
  patch 
  at 
  the 
  point 
  of 
  the 
  knee 
  within 
  the 
  rufous 
  

   area. 
  

  

  L. 
  pacator, 
  sp. 
  n. 
  

  

  Hah. 
  Rio 
  Pachitea, 
  Peru. 
  Alt. 
  150 
  m. 
  

   Type. 
  Adult 
  female. 
  B.M. 
  no. 
  4. 
  7. 
  7. 
  5. 
  Original 
  num- 
  

   ber 
  '^14 
  Collected 
  loth 
  Nov., 
  1903, 
  by 
  Otto 
  Garlepp. 
  

  

  B. 
  Under 
  surface 
  dark 
  brown 
  to 
  the 
  navel, 
  only 
  the 
  lower 
  belly 
  being 
  

  

  rufous. 
  Dorsal 
  marbliug 
  suffused 
  with 
  bully, 
  the 
  light 
  rings 
  on 
  the 
  

   hairs 
  clear 
  buff. 
  No 
  dark 
  patch 
  on 
  tip 
  of 
  knee, 
  the 
  whole 
  leg 
  rich 
  

   rufous. 
  Basal 
  three 
  inches 
  of 
  tail 
  more 
  or 
  less 
  mixed 
  with 
  ferru- 
  

   ginous. 
  

  

  * 
  Most 
  curiously, 
  the 
  prominent 
  and 
  extended 
  white 
  whiskers, 
  such 
  as 
  

   are 
  present 
  in 
  the 
  type 
  of 
  leucoyenys, 
  prove 
  to 
  diminish 
  with 
  age, 
  a 
  point 
  

   w^hich 
  I 
  have 
  not 
  seen 
  noticed 
  before. 
  Thus 
  we 
  have 
  young 
  specimens 
  

   (4-5 
  inches 
  in 
  length) 
  of 
  L. 
  illiyeri 
  and 
  apiculatus, 
  each 
  obtained 
  with 
  

   adults, 
  and 
  each 
  with 
  large 
  and 
  prominent 
  white 
  whiskers, 
  which 
  have 
  

   practically 
  disappeared 
  when 
  the 
  animal 
  is 
  full-grown. 
  Allowing 
  for 
  

   tiiis 
  alteration, 
  the 
  type 
  of 
  leucoyenys 
  would 
  appear 
  to 
  be 
  quite 
  like 
  

   devillei. 
  

  

  