﻿358 
  LASIOPYGA 
  

  

  Even 
  comparing 
  the 
  skull 
  of 
  the 
  male 
  from 
  the 
  Benito 
  River 
  with 
  the 
  

   type 
  of 
  L. 
  g. 
  pallida, 
  the 
  much 
  higher 
  elevation 
  of 
  the 
  frontal 
  bone 
  in 
  

   the 
  skull 
  of 
  the 
  latter 
  is 
  clearly 
  perceptible, 
  and 
  the 
  more 
  prominent 
  

   anterior 
  portion 
  of 
  the 
  nasals 
  is 
  also 
  easily 
  noticed. 
  These 
  differences 
  

   in 
  colors 
  and 
  cranial 
  characters 
  seem 
  to 
  warrant 
  the 
  separation 
  of 
  the 
  

   Gaboon 
  Monkeys, 
  as 
  a 
  race 
  at 
  least, 
  from 
  L. 
  grayi. 
  

  

  Lasiopyga 
  petronell^: 
  (Buttikof 
  er) 
  . 
  

  

  Cercopithecus 
  petronellce 
  Buttikofer, 
  Notes 
  from 
  Leyden 
  Museum, 
  

   XXXIV, 
  1911, 
  p. 
  1. 
  

  

  WHITE-CROWNED 
  GUENON. 
  

  

  Type 
  locality. 
  Upper 
  Congo, 
  exact 
  locality 
  unknown. 
  Type 
  in 
  

   Leyden 
  Museum. 
  

  

  Color. 
  "A 
  narrow, 
  but 
  rather 
  high 
  median 
  crest, 
  beginning 
  near 
  

   the 
  front 
  and 
  ending 
  on 
  the 
  center 
  of 
  the 
  crown, 
  entire 
  hinder 
  crown, 
  

   occiput 
  and 
  hind 
  neck 
  down 
  to 
  the 
  shoulders 
  olive-green, 
  speckled 
  with 
  

   black, 
  each 
  hair 
  being 
  black 
  with 
  commonly 
  two 
  broad 
  yellowish 
  rings, 
  

   of 
  which 
  the 
  outer 
  one 
  is 
  subterminal, 
  leaving 
  a 
  long 
  black 
  tip 
  to 
  each 
  

   hair. 
  Whole 
  back 
  from 
  the 
  shoulders 
  to 
  the 
  root 
  of 
  the 
  tail, 
  and 
  even 
  

   extending 
  upon 
  the 
  latter, 
  rich 
  chestnut-brown, 
  with 
  black 
  specklings, 
  

   produced 
  by 
  the 
  black 
  tips 
  to 
  each 
  hair. 
  No 
  black 
  on 
  the 
  arms, 
  their 
  

   outer 
  surface 
  being 
  olive-green 
  like 
  crown 
  and 
  hind 
  neck 
  ; 
  outer 
  surface 
  

   of 
  legs 
  olive 
  yellow, 
  faintly 
  speckled 
  with 
  black 
  ; 
  no 
  white 
  patches 
  on 
  

   crupper, 
  hands 
  and 
  feet 
  grayish, 
  scarcely 
  tinged 
  with 
  olive. 
  Front 
  

   and 
  sides 
  of 
  anterior 
  crown 
  white, 
  faintly 
  speckled 
  with 
  black, 
  the 
  

   white 
  crown 
  patches 
  separated 
  by 
  the 
  narrow 
  olive-green 
  crest, 
  and 
  

   bordered 
  on 
  the 
  outside 
  by 
  a 
  broad, 
  pure 
  black 
  band, 
  running 
  from 
  the 
  

   orbits 
  to 
  and 
  even 
  below 
  the 
  ears. 
  Long, 
  bushy 
  whiskers 
  below 
  this 
  

   black 
  stripe, 
  and 
  a 
  long 
  tuft 
  of 
  hairs 
  in 
  the 
  ears, 
  proceeding 
  far 
  behind 
  

   the 
  top 
  of 
  the 
  hinder 
  edge 
  of 
  the 
  ear, 
  yellowish 
  white. 
  Chin, 
  throat, 
  

   breast 
  and 
  inner 
  surface 
  of 
  arms 
  white, 
  with 
  a 
  yellowish 
  tinge, 
  belly 
  

   and 
  inner 
  surface 
  of 
  legs 
  uniform 
  ochraceous 
  yellow. 
  Tail 
  olive 
  green 
  

   on 
  its 
  basal 
  half, 
  passing 
  into 
  black 
  on 
  the 
  terminal 
  half 
  and 
  becoming 
  

   pure 
  black 
  at 
  the 
  tip. 
  Skin 
  of 
  face 
  blue, 
  upper 
  and 
  lower 
  lip 
  flesh- 
  

   color, 
  covered 
  with 
  very 
  short 
  white 
  hairs, 
  intermixed 
  with 
  sparsely- 
  

   set 
  long, 
  bristly 
  hairs 
  which, 
  like 
  the 
  long 
  hairs 
  of 
  the 
  eyebrows, 
  are 
  

   black. 
  Skin 
  of 
  the 
  whole 
  body 
  underneath 
  the 
  fur, 
  light 
  blue. 
  Iris 
  

   light 
  chestnut-brown." 
  

  

  Measurements. 
  "Total 
  length, 
  1,020; 
  tail, 
  640; 
  fore-arm 
  from 
  

   elbow 
  to 
  tip 
  of 
  fingers, 
  170; 
  leg 
  from 
  knee 
  to 
  heel, 
  140; 
  foot 
  from 
  heel 
  

   to 
  tip 
  of 
  toes, 
  120." 
  

  

  