﻿LAGOTHRIX 
  59 
  

  

  Two 
  specimens 
  are 
  in 
  the 
  British 
  Museum 
  Collection, 
  which 
  differ 
  

   so 
  markedly 
  from 
  all 
  others, 
  that 
  it 
  seems 
  impossible 
  to 
  assign 
  them 
  to 
  

   any 
  known 
  or 
  described 
  species. 
  The 
  fur 
  is 
  soft 
  and 
  very 
  thick 
  par- 
  

   ticularly 
  so 
  at 
  the 
  base 
  of 
  the 
  tail. 
  One 
  is 
  dark 
  purplish 
  brown 
  or 
  

   black 
  on 
  the 
  upper 
  parts 
  to 
  rump, 
  when 
  it 
  becomes 
  blackish 
  gray 
  on 
  

   legs 
  and 
  tail 
  ; 
  the 
  other 
  example 
  is 
  darker, 
  being 
  nearly 
  black 
  with 
  but 
  

   little 
  of 
  the 
  purplish 
  shade. 
  The 
  skulls 
  resemble, 
  as 
  may 
  be 
  expected 
  

   those 
  of 
  L. 
  lagotricha 
  and 
  L. 
  infumata, 
  in 
  general, 
  but 
  the 
  nasals 
  

   have 
  a 
  depression 
  in 
  the 
  center, 
  and 
  the 
  anterior 
  half 
  stands 
  at 
  right 
  

   angles 
  to 
  the 
  posterior, 
  and 
  they 
  are 
  very 
  broad 
  anteriorly 
  ; 
  the 
  brain- 
  

   case 
  is 
  not 
  so 
  long 
  as 
  those 
  of 
  the 
  species 
  compared, 
  and 
  the 
  narial 
  

   opening 
  is 
  of 
  a 
  different 
  shape, 
  like 
  a 
  heart 
  but 
  not 
  so 
  pointed, 
  more 
  

   rounded 
  on 
  the 
  lower 
  side. 
  

  

  Lagothrix 
  thomasi 
  Elliot. 
  

  

  Lagothrix 
  thomasi 
  Elliot, 
  Ann. 
  Mag. 
  Nat. 
  Hist., 
  IV, 
  1909, 
  8th 
  Ser., 
  

   p. 
  245. 
  

  

  Type 
  locality. 
  Callanga, 
  Cuzco, 
  Peru, 
  1,500 
  m. 
  altitude. 
  Type 
  

   in 
  British 
  Museum. 
  

  

  Color. 
  Head 
  in 
  front 
  of 
  ears 
  seal 
  brown; 
  upper 
  parts 
  and 
  sides 
  

   of 
  body, 
  and 
  arms 
  to 
  elbows 
  grizzled 
  gray 
  and 
  ochraceous, 
  the 
  hairs 
  

   being 
  ochraceous 
  at 
  base, 
  ringed 
  with 
  black 
  and 
  white 
  and 
  tipped 
  with 
  

   white 
  ; 
  dorsal 
  line 
  blackish 
  ; 
  hairs 
  on 
  back 
  of 
  neck 
  ochraceous 
  with 
  a 
  

   single 
  broad 
  subterminal 
  black 
  band 
  and 
  white 
  tips, 
  causing 
  this 
  part 
  

   to 
  be 
  darker 
  than 
  the 
  rest 
  of 
  the 
  upper 
  parts, 
  except 
  dorsal 
  line 
  ; 
  fore- 
  

   arms 
  and 
  legs, 
  grizzled 
  black 
  and 
  tawny, 
  the 
  hairs 
  being 
  tawny 
  with 
  

   subterminal 
  black 
  bar 
  and 
  white 
  tips 
  ; 
  hands 
  and 
  feet 
  black, 
  the 
  hairs 
  

   with 
  tawny 
  tips; 
  inner 
  side 
  of 
  arms 
  and 
  legs, 
  and 
  central 
  portion 
  of 
  

   chest 
  and 
  abdomen, 
  black; 
  tail 
  above, 
  and 
  basal 
  portion 
  beneath 
  

   grizzled 
  gray 
  and 
  ochraceous 
  like 
  back 
  ; 
  remainder 
  beneath 
  black. 
  Ex 
  

   type 
  British 
  Museum. 
  

  

  Measurements. 
  Size 
  equal 
  to 
  L. 
  lagotricha. 
  Skull: 
  occipito- 
  

   nasal 
  length, 
  98; 
  Hensel, 
  88.4; 
  zygomatic 
  width, 
  79.4; 
  interorbital 
  

   width, 
  59.4 
  ; 
  palatal 
  length, 
  39.6 
  ; 
  median 
  length 
  of 
  nasals, 
  107 
  ; 
  length 
  

   of 
  upper 
  molar 
  series, 
  24; 
  length 
  of 
  mandible, 
  78; 
  length 
  of 
  lower 
  

   molar 
  series, 
  38.5. 
  Ex 
  type 
  British 
  Museum. 
  

  

  This 
  is 
  a 
  larger 
  monkey 
  than 
  L. 
  ubericola 
  and 
  fully 
  equal 
  in 
  size 
  

   to 
  L. 
  lagotricha. 
  The 
  type 
  is 
  an 
  old 
  individual, 
  with 
  teeth 
  greatly 
  

   worn 
  and 
  blackened. 
  It 
  is 
  much 
  darker 
  than 
  L. 
  ubericola 
  and 
  the 
  

   base 
  of 
  the 
  hairs 
  ochraceous 
  instead 
  of 
  buff. 
  There 
  are 
  none 
  of 
  the 
  

  

  