﻿18 
  AOTUS 
  

  

  full 
  grown 
  and 
  shows 
  no 
  signs 
  of 
  immaturity, 
  and 
  with 
  its 
  decided 
  head 
  

   markings, 
  an 
  entirely 
  different 
  color, 
  it 
  seems 
  hardly 
  correct 
  to 
  unite 
  

   it 
  with 
  A. 
  infulatus. 
  As 
  is 
  usual 
  with 
  the 
  types 
  of 
  species 
  of 
  the 
  

   earlier 
  authors, 
  no 
  locality 
  beyond 
  "Haute 
  Amazone, 
  Perou," 
  is 
  given 
  

   with 
  the 
  specimens. 
  The 
  type 
  was 
  obtained 
  by 
  Castelnau 
  and 
  Deville 
  

   in 
  their 
  expedition 
  to 
  South 
  America 
  and 
  was 
  figured 
  in 
  the 
  Atlas 
  of 
  

   their 
  published 
  work. 
  

  

  Aotus 
  gularis 
  Dollman. 
  

  

  Aotus 
  gularis 
  Dollman, 
  Ann. 
  Mag. 
  Nat. 
  Hist., 
  IV, 
  8th 
  Ser., 
  1909, 
  

   p. 
  201. 
  

  

  Type 
  locality. 
  Mouth 
  of 
  Rio 
  Chocho 
  on 
  Upper 
  Rio 
  Napo, 
  

   Ecuador. 
  Type 
  in 
  British 
  Museum. 
  

  

  Color. 
  Three 
  heavy 
  black 
  lines, 
  one 
  from 
  the 
  corner 
  of 
  each 
  eye 
  

   and 
  one 
  from 
  above 
  the 
  nose, 
  all 
  meeting 
  on 
  the 
  occiput 
  ; 
  buffy 
  white 
  

   spot 
  above 
  each 
  eye, 
  grading 
  into 
  russet, 
  extending 
  backward 
  to 
  

   occiput; 
  sides 
  of 
  head 
  and 
  neck, 
  and 
  flanks, 
  brownish 
  gray; 
  dorsal 
  

   line 
  mars 
  brown, 
  hairs 
  purplish 
  on 
  basal 
  half, 
  and 
  banded 
  with 
  mars 
  

   brown 
  and 
  black; 
  outer 
  side 
  of 
  arms 
  dark 
  brownish 
  gray; 
  outer 
  side 
  

   of 
  legs 
  like 
  flanks 
  ; 
  chin, 
  throat 
  and 
  chest 
  gray 
  ; 
  under 
  parts 
  of 
  body, 
  

   and 
  inner 
  side 
  of 
  legs 
  buff; 
  hands 
  and 
  feet 
  black; 
  tail 
  at 
  base 
  above 
  

   and 
  beneath 
  orange, 
  remainder 
  to 
  tip 
  black. 
  Ex 
  type 
  British 
  Museum. 
  

  

  Measurements. 
  Total 
  length, 
  690 
  ; 
  tail, 
  350 
  ; 
  foot, 
  20. 
  Skull 
  : 
  total 
  

   length, 
  63.4; 
  occipito-nasal 
  length, 
  59.3; 
  intertemporal 
  width, 
  34; 
  

   breadth 
  of 
  braincase, 
  33; 
  Hensel, 
  40; 
  zygomatic 
  width, 
  40; 
  median 
  

   length 
  of 
  nasals, 
  12; 
  palatal 
  length, 
  16; 
  length 
  of 
  upper 
  molar 
  series, 
  

   15; 
  length 
  of 
  mandible, 
  37.6; 
  length 
  of 
  lower 
  molar 
  series, 
  16.4. 
  Ex 
  

   type 
  British 
  Museum. 
  

  

  This 
  animal 
  differs 
  from 
  A. 
  microdon 
  from 
  Macas, 
  in 
  its 
  gray 
  

   body 
  and 
  the 
  jet 
  black 
  stripes 
  on 
  the 
  head, 
  and 
  from 
  A. 
  nigriceps 
  in 
  the 
  

   russet 
  portion 
  of 
  the 
  crown 
  stripe, 
  and 
  in 
  the 
  mars 
  brown 
  of 
  the 
  dorsal 
  

   region, 
  and 
  brownish 
  gray 
  flanks. 
  The 
  molar 
  series 
  of 
  teeth 
  are 
  

   smaller. 
  

  

  Aotus 
  microdon 
  Dollman. 
  

  

  Aotus 
  microdon 
  Dollman, 
  Ann. 
  Mag. 
  Nat. 
  Hist., 
  IV, 
  8th 
  Ser., 
  

  

  1909, 
  p. 
  203. 
  

   Type 
  locality. 
  Macas, 
  Ecuador. 
  

  

  