﻿260 
  PROCEEDINGS 
  OF 
  THE 
  FOURTH 
  ENTOMOLOGICAL 
  MEETING 
  

  

  Also 
  on 
  July 
  10, 
  1920:— 
  

  

  ' 
  Mr. 
  Bainbrigge 
  Fletcher 
  writes. 
  ' 
  I 
  sliould 
  think 
  we 
  are 
  roughly 
  

   400-500 
  miles 
  beyond 
  the 
  range 
  of 
  Paj)ilio 
  hector. 
  The 
  elevation 
  at 
  

   Pusa 
  is 
  about 
  150 
  feet 
  above 
  sea-level' 
  These 
  words 
  would 
  also 
  apply 
  

   to 
  this 
  place 
  which 
  is 
  not 
  very 
  far 
  from 
  Pusa. 
  We 
  are 
  evidently 
  a 
  little 
  

   closer 
  to 
  the 
  hector 
  range 
  than 
  Dehra 
  Dun 
  and 
  the 
  romulus 
  form 
  is 
  slightly 
  

   stronger 
  here 
  " 
  (see 
  the 
  table 
  on 
  page 
  261). 
  

  

  Concerning 
  the 
  Dehra 
  Dun 
  series 
  Mr, 
  Ollenbach 
  wrote 
  in 
  September 
  

   17 
  th, 
  1919 
  :— 
  

  

  " 
  I 
  made 
  no 
  choice 
  but 
  took 
  all 
  that 
  came, 
  so 
  far 
  as 
  I 
  was 
  able 
  to. 
  

   The 
  romulus 
  form 
  is 
  certainly 
  very 
  uncommon 
  here 
  and 
  P. 
  hector 
  does 
  

   not 
  occur. 
  The 
  nearest 
  parts 
  of 
  its 
  range 
  are 
  about 
  800 
  miles 
  to 
  the 
  

   East 
  and 
  the 
  same 
  distance 
  to 
  the 
  South. 
  P. 
  aristolocliiw 
  is 
  plentiful 
  

   here 
  now, 
  though 
  some 
  twenty 
  years 
  ago 
  it 
  was 
  not 
  to 
  be 
  seen." 
  

  

  On 
  this 
  last 
  interesting 
  point 
  he 
  wrote 
  again 
  on 
  March 
  10th, 
  1920 
  : 
  — 
  

  

  " 
  I 
  cannot 
  quite 
  remember 
  when 
  P. 
  aristolochice 
  first 
  appeared 
  in 
  

   Dehra 
  Dun, 
  but 
  probably 
  about 
  tWenty-five 
  years 
  ago. 
  I 
  have 
  a 
  speci- 
  

   men 
  in 
  my 
  collection 
  taken 
  in 
  the 
  year 
  1895. 
  They 
  had 
  probably 
  only 
  

   just 
  appeared 
  at 
  that 
  time 
  and 
  were 
  very 
  scarce, 
  although 
  now 
  they 
  

   are 
  iust 
  the 
  reverse 
  ; 
  aristolochice 
  is 
  however 
  by 
  no 
  means 
  so 
  numerous 
  

   as 
  folytes, 
  which 
  is 
  a 
  very 
  common 
  species." 
  

  

  In 
  1920 
  Mr. 
  Ollenbach, 
  was 
  unable 
  to 
  continue 
  to 
  collect 
  poJytes 
  

   in 
  Dehra 
  Dun 
  because 
  " 
  for 
  some 
  unknown 
  reason 
  this 
  butterfly 
  and 
  

   P. 
  aristolochue 
  were 
  very 
  scarce 
  although 
  in 
  ordinary 
  seasons 
  they 
  

   were 
  very 
  common." 
  

  

  In 
  the 
  following 
  tabular 
  statement 
  I 
  have 
  classified 
  the 
  folytes 
  

   females 
  in 
  four 
  groups 
  according 
  to 
  the 
  absence 
  or 
  presence, 
  and 
  degree 
  

   of 
  development, 
  of 
  the 
  white 
  spot 
  in 
  the 
  hind 
  wing 
  cell. 
  The 
  transi- 
  

   tion 
  between 
  siichins, 
  with 
  no 
  white 
  in 
  the 
  cell, 
  and 
  polytes, 
  possessing 
  

   it 
  is 
  complete 
  — 
  so 
  much 
  so 
  that 
  all 
  those 
  specimens 
  in 
  the 
  fourth 
  column 
  

   of 
  the 
  table 
  and 
  some 
  of 
  those 
  in 
  the 
  fifth 
  would, 
  unless 
  carefully 
  examined, 
  

   be 
  placed 
  in 
  the 
  third 
  as 
  typical 
  examples 
  of 
  stichius. 
  The 
  white 
  mark 
  

   in 
  the 
  cell 
  of 
  such 
  individuals 
  is 
  only 
  represented 
  by 
  scattered 
  scales 
  

   often 
  less 
  than 
  a 
  dozen 
  in 
  number. 
  The 
  comparisons 
  which 
  formed 
  the 
  

   basis 
  of 
  the 
  table 
  were 
  made 
  upon 
  the 
  under-surface 
  of 
  the 
  wings 
  only 
  

   but 
  it 
  is 
  not 
  anticipated 
  that 
  an 
  examination 
  of 
  the 
  upper-surface 
  

   would 
  lead 
  to 
  any 
  change. 
  

  

  