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  Kent 
  (Westmoreland) 
  and 
  Leven 
  (Lancashire). 
  The 
  two 
  

   estuaries 
  are 
  separated 
  by 
  the 
  Cartmell 
  Fells, 
  which 
  attain 
  a 
  

   nearly 
  uniform 
  height 
  of 
  about 
  700 
  ft. 
  

  

  As 
  is 
  well 
  known 
  this 
  form 
  of 
  aegon 
  differs 
  from 
  the 
  other 
  

   races 
  of 
  the 
  species, 
  which 
  range 
  from 
  Great 
  Britain 
  to 
  China 
  

   and 
  Corea 
  and 
  from 
  Lapland 
  to 
  Portugal, 
  in 
  the 
  fact 
  that 
  the 
  

   females 
  are 
  hardly 
  ever, 
  without 
  a 
  wash 
  or 
  sprinkling 
  of 
  blue 
  ; 
  

   the 
  only 
  race 
  which 
  resembles 
  it 
  in 
  this 
  respect 
  being 
  var. 
  

   Corsica, 
  limited 
  to 
  that 
  island, 
  but 
  differing 
  markedly 
  in 
  the 
  

   characters 
  of 
  the 
  underside. 
  It 
  appears 
  that 
  the 
  only 
  satis- 
  

   factory 
  way 
  of 
  examining 
  the 
  characters 
  of 
  a 
  population 
  varying 
  

   so 
  much 
  as 
  this 
  form 
  does 
  is 
  to 
  take 
  " 
  samples 
  " 
  in 
  different 
  

   localities, 
  carefully 
  abstaining 
  from 
  selecting 
  specimens, 
  except 
  

   for 
  condition, 
  and 
  in 
  numbers 
  sufficient 
  to 
  include 
  at 
  least 
  the 
  

   commoner 
  variants. 
  It 
  is 
  obvious 
  that 
  this 
  method 
  if 
  pursued 
  

   by 
  many 
  collectors 
  might 
  lead 
  to 
  the 
  extermination 
  of 
  a 
  species. 
  

   It 
  is 
  also 
  obvious 
  that 
  unless 
  a 
  series 
  is 
  known 
  to 
  have 
  been 
  

   collected 
  in 
  this 
  manner, 
  as 
  a 
  sample, 
  its 
  value 
  for 
  comparison 
  

   is 
  diminished. 
  

  

  The 
  results 
  arrived 
  at 
  from 
  the 
  examination 
  of 
  the 
  

   specimens 
  are 
  : 
  — 
  

  

  (1) 
  That 
  the 
  population 
  of 
  this 
  species 
  inhabiting 
  Holker 
  

   moss, 
  on 
  the 
  Leven 
  estuary, 
  diff"ers 
  slightly 
  from 
  that 
  of 
  

   the 
  mosses 
  about 
  the 
  river 
  Kent 
  and 
  its 
  tributary, 
  the 
  

   Gilpin. 
  If 
  the 
  females 
  from 
  different 
  localities 
  are 
  arranged 
  

   in 
  order 
  of 
  blueness 
  it 
  is 
  seen 
  that 
  the 
  Holker 
  females 
  at 
  the 
  

   beginning 
  of 
  the 
  series 
  are 
  not 
  so 
  blue 
  as 
  those 
  from 
  the 
  West- 
  

   moreland 
  mosses, 
  and 
  that 
  there 
  is 
  a 
  longer 
  " 
  tail 
  " 
  to 
  the 
  

   series 
  of 
  nearly 
  brown 
  females. 
  In 
  other 
  words, 
  the 
  Leven 
  

   females 
  vary 
  about 
  a 
  less 
  blue 
  mean 
  than 
  do 
  those 
  inhabiting 
  

   the 
  Kent 
  estuary 
  to 
  the 
  east, 
  and 
  separated 
  from 
  them 
  by 
  

   the 
  intervening 
  hill 
  barrier. 
  

  

  (2) 
  Delamere 
  Forest 
  and 
  Great 
  Orme's 
  Head 
  are, 
  or 
  have 
  

   been 
  (for 
  it 
  is 
  doubtful 
  if 
  the 
  species 
  still 
  exists 
  at 
  the 
  latter 
  

   locality) 
  inhabited 
  by 
  forms 
  intermediate 
  between 
  those 
  

   found 
  elsewhere 
  in 
  England 
  (illustrated 
  by 
  the 
  series 
  from 
  the 
  

  

  ' 
  New 
  Forest 
  and 
  the 
  North 
  Downs) 
  and 
  var. 
  masseyi 
  from 
  the 
  

   estuarine 
  mosses. 
  For 
  examples 
  of 
  these 
  intermediate 
  forms 
  

   I 
  am 
  indebted 
  to 
  the 
  generosity 
  of 
  Mr. 
  Wm. 
  Mansbridge, 
  

  

  PROG. 
  ENT. 
  SOC. 
  LOND., 
  V, 
  1919. 
  E 
  

  

  