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  applied 
  to 
  all 
  colour 
  variations 
  with 
  the 
  band 
  broken 
  into 
  costal 
  and 
  

   marginal 
  parts, 
  as 
  it 
  would 
  have 
  simplified 
  matters 
  very 
  consider- 
  

   ably. 
  Apart 
  from 
  the 
  four 
  main 
  colour 
  variations 
  and 
  their 
  sub- 
  

   variations 
  of 
  a 
  broken 
  median 
  band, 
  we 
  also 
  have 
  another 
  distinct 
  

   variety, 
  namely, 
  ab. 
  snfftma, 
  in 
  which 
  the 
  anterior 
  wings 
  are 
  of 
  the 
  

   normal 
  virescens 
  aberration, 
  namely, 
  entirely 
  green, 
  with 
  the 
  usual 
  

   cross 
  band, 
  but 
  the 
  hindwings 
  black. 
  Two 
  such 
  aberrations 
  are 
  

   shown 
  in 
  the 
  exhibit 
  whish 
  I 
  am 
  making. 
  Apart 
  from 
  the 
  varieties 
  

   mentioned 
  there 
  is 
  only 
  one 
  other 
  of 
  a 
  very 
  distinct 
  character 
  which, 
  

   however, 
  I 
  have 
  not 
  yet^een. 
  It 
  is 
  similar 
  to 
  ab. 
  obsoleta, 
  but 
  has 
  

   a 
  elaviform 
  mark 
  at 
  the 
  base 
  of 
  the 
  forewings, 
  viz., 
  ab. 
  j^echinauni. 
  

  

  " 
  Reverting 
  to 
  the 
  colour 
  variations 
  in 
  combination 
  with 
  the 
  

   band 
  variations, 
  it 
  is 
  fairly 
  easy 
  to 
  name 
  the 
  varieties 
  of 
  tilitB. 
  For 
  

   instance, 
  those 
  with 
  the 
  green 
  forewings, 
  namely, 
  viresceiis 
  with 
  a 
  

   complete 
  band 
  would 
  become 
  virescens-transversa 
  . 
  With 
  the 
  band 
  

   broken 
  into 
  two 
  portions, 
  virescens-uiaculata. 
  With 
  the 
  costal 
  spot 
  

   only, 
  virescens-costlpiincta. 
  Similarly, 
  in 
  the 
  same 
  way, 
  the 
  pale 
  

   grey 
  or 
  fawn 
  -grey 
  ground 
  colour, 
  i.e., 
  pallida, 
  with 
  complete 
  trans- 
  

   verse 
  band 
  becomes 
  pallida-transversa 
  ; 
  with 
  the 
  costal 
  spot 
  only, 
  

   pallida-costipitncta, 
  and 
  so 
  forth. 
  I 
  regret 
  that 
  I 
  am 
  unable, 
  even 
  

   with 
  such 
  an 
  extensive 
  series 
  as 
  I 
  have 
  bred 
  over 
  a 
  series 
  of 
  several 
  

   years, 
  to 
  show 
  all 
  the 
  varieties 
  in 
  question. 
  It 
  would 
  not 
  be 
  

   difficult, 
  however, 
  to 
  obtain 
  a 
  fairly 
  comprehensive 
  series 
  of 
  these 
  

   with 
  the 
  exception 
  perhaps 
  of 
  obsoleta 
  and 
  peclonanni, 
  if 
  one 
  were 
  to 
  

   pair 
  up 
  a 
  green 
  male 
  with 
  a 
  green 
  female, 
  and 
  so 
  on 
  for 
  the 
  three 
  

   other 
  main 
  colour 
  varieties, 
  because, 
  as 
  you 
  are 
  doubtless 
  well 
  

   aware, 
  the 
  median 
  band 
  is 
  a 
  very 
  inconstant 
  factor 
  in 
  any 
  one 
  

   brood." 
  

  

  In 
  the 
  discussion 
  which 
  followed 
  Mr. 
  R. 
  Adkin, 
  having 
  expressed 
  

   the 
  indebtedness 
  of 
  the 
  meeting 
  to 
  Mr. 
  Sperring 
  for 
  the 
  very 
  full 
  

   notes 
  that 
  he 
  had 
  brought 
  before 
  them, 
  said 
  that 
  his 
  own 
  experience 
  

   of 
  the 
  species 
  was 
  of 
  somewhat 
  ancient 
  date 
  and 
  confined 
  largely 
  to 
  

   the 
  neighbourhood 
  of 
  Lewisham, 
  when 
  that 
  place 
  was 
  to 
  all 
  intents 
  

   and 
  purposes 
  a 
  rural 
  village. 
  In 
  those 
  days 
  lime 
  trees 
  were 
  very 
  

   frequent 
  there, 
  many 
  of 
  them 
  of 
  considerable 
  age, 
  while 
  others 
  were 
  

   recently 
  planted, 
  in 
  the 
  commencement 
  of 
  the 
  transformation 
  of 
  the 
  

   place 
  into 
  the 
  urban 
  district 
  which 
  it 
  had 
  now 
  become. 
  The 
  species 
  

   was 
  then 
  of 
  very 
  common 
  occurrence, 
  and 
  appeared 
  to 
  be 
  confined 
  

   entirely 
  to 
  the 
  lime 
  trees, 
  for 
  although 
  there 
  were 
  also 
  many 
  elms 
  

   and 
  other 
  trees 
  in 
  the 
  neighbourhood, 
  he 
  had 
  never, 
  within 
  his 
  

   recollection, 
  found 
  it 
  in 
  connection 
  with 
  them. 
  He 
  had 
  frequently 
  

   taken 
  the 
  ovum, 
  and 
  in 
  his 
  experience 
  it 
  was 
  usually 
  deposited 
  

  

  