﻿DARWIN'S 
  KOKLASS 
  PHEASANT 
  AND 
  ITS 
  ALLIES 
  

  

  In 
  this 
  group 
  df 
  Koklass 
  the 
  pattern 
  on 
  the 
  mantle 
  and 
  much 
  of 
  the 
  body 
  plumage 
  

   is 
  quadruple, 
  instead 
  of 
  double 
  as 
  in 
  xanthospila, 
  the 
  two 
  black 
  lines 
  of 
  the 
  latter 
  group 
  

   of 
  birds 
  being 
  split 
  into 
  four. 
  

  

  The 
  ventral 
  chestnut 
  becomes 
  reduced 
  in 
  these 
  southern 
  Koklass, 
  there 
  being 
  

   even 
  in 
  the 
  strongest 
  marked 
  birds 
  a 
  tendency 
  to 
  greater 
  distribution 
  and 
  correlated 
  

   dilution 
  of 
  the 
  pigment. 
  It 
  disappears 
  entirely 
  in 
  the 
  subspecies 
  styani. 
  

  

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