﻿606 
  Mr. 
  O. 
  Thomas 
  on 
  

  

  LXX. 
  — 
  Three 
  new 
  Mammals 
  from 
  the 
  Loiosr 
  Amazons. 
  

   By 
  Oldfield 
  Thomas. 
  

  

  (Published 
  by 
  permission 
  of 
  the 
  Trustees 
  of 
  the 
  British 
  Museum.) 
  

  

  Thanks 
  to 
  the 
  kindness 
  of 
  the 
  authorities 
  of 
  the 
  Goeldi 
  

   Museum, 
  Para, 
  I 
  have 
  had 
  the 
  privilege 
  of 
  working 
  out 
  a 
  

   collection 
  of 
  small 
  mammals 
  made 
  by 
  the 
  Director 
  of 
  that 
  

   Museum, 
  Friiulein 
  Dr. 
  E. 
  Snethlage, 
  on 
  the 
  Lower 
  Tocantins 
  

   — 
  chiefly 
  at 
  Cametjl, 
  besides 
  a 
  certain 
  number 
  of 
  specimens 
  

   obtained 
  at 
  Para 
  itself. 
  Among 
  these 
  there 
  are 
  several 
  rare 
  

   and 
  interesting 
  species, 
  and 
  the 
  following 
  three 
  new 
  ones 
  : 
  — 
  

  

  Callicebus 
  emilios, 
  sp. 
  n. 
  

  

  Rufous-bellied 
  group. 
  Back 
  rich 
  bay 
  or 
  hazel. 
  

  

  Upper 
  surface, 
  instead 
  of 
  the 
  usual 
  grizzled 
  greyish 
  brown 
  

   found 
  in 
  most 
  of 
  the 
  rufous-bellied 
  Titis, 
  rich 
  rufous 
  bay, 
  or 
  

   hazel 
  *, 
  this 
  colour 
  covering 
  the 
  whole 
  back, 
  from 
  the 
  

   occiput 
  to 
  the 
  rump. 
  On 
  the 
  nape 
  the 
  hairs 
  are 
  grizzled 
  

   brown 
  and 
  whitish, 
  with 
  rufous 
  tips 
  ; 
  on 
  the 
  back 
  they 
  are 
  

   dark 
  smoky 
  brown 
  for 
  two-thirds 
  their 
  length, 
  their 
  terminal 
  

   third 
  rich 
  hazel. 
  Crown 
  greyish, 
  more 
  whitish 
  anteriorly. 
  

   Ears 
  ashy 
  grey, 
  the 
  long 
  hairs 
  on 
  the 
  antitragus 
  tipped 
  with 
  

   black. 
  Whole 
  of 
  under 
  surface 
  and 
  inner 
  side 
  of 
  limbs 
  

   bright 
  orange 
  rufous. 
  Fore 
  limbs 
  from 
  shoulders 
  to 
  wrists, 
  

   an 
  ill-defined 
  line 
  along 
  flanks 
  (between 
  the 
  hazel 
  of 
  the 
  

   back 
  and 
  the 
  rufous 
  of 
  the 
  belly), 
  and 
  hind 
  limbs 
  from 
  hips 
  

   to 
  metatarsus 
  grizzled 
  ashy 
  grey; 
  hands 
  and 
  posterior 
  digits 
  

   whitish. 
  Tail 
  chestnut-brown 
  at 
  base, 
  then 
  deep 
  black 
  

   (though 
  the 
  bases 
  of 
  the 
  hairs 
  are 
  whitish), 
  the 
  end 
  with 
  a 
  

   whitish 
  tuft. 
  

  

  Measurements 
  of 
  the 
  type 
  (measured 
  on 
  skin) 
  : 
  — 
  

  

  Head 
  and 
  body 
  320 
  mm. 
  ; 
  tail 
  400; 
  hind 
  foot 
  81. 
  

  

  JBab. 
  Lower 
  Amazons. 
  Type 
  from 
  the 
  Para 
  Zoological 
  

   Gardens. 
  

  

  Type. 
  Adult 
  female. 
  B.M. 
  no. 
  11.4.28.1. 
  Presented 
  

   by 
  the 
  Goeldi 
  Museum, 
  Para. 
  

  

  This 
  most 
  handsome 
  and 
  striking 
  species 
  is 
  distinguishable 
  

   at 
  a 
  glance 
  by 
  the 
  rich 
  deep 
  hazel 
  or 
  maroon-chestnut 
  of 
  its 
  

   back, 
  no 
  other 
  Callicebus 
  having 
  any 
  such 
  coloration. 
  Its 
  

   nearest 
  allies 
  would 
  seem 
  to 
  be 
  C. 
  dona^hilus, 
  moloch, 
  

   ornatus, 
  and 
  remulus 
  i 
  but 
  the 
  back 
  in 
  all 
  of 
  these 
  is 
  of 
  the 
  

  

  * 
  No 
  figure 
  in 
  Ridgway 
  quite 
  matches 
  the 
  colour, 
  which 
  is 
  darker, 
  

   richer, 
  and 
  more 
  vivid 
  than 
  " 
  hazel." 
  

  

  