﻿67 
  

  

  from 
  this 
  flight, 
  one 
  side 
  of 
  the 
  muslin 
  can 
  be 
  removed 
  without 
  

   danger. 
  

  

  '* 
  Variation. 
  — 
  Mimas 
  tilia 
  is 
  one 
  of 
  the 
  most 
  variable 
  of 
  insects, 
  

   not 
  only 
  in 
  regard 
  to 
  the 
  ground 
  colour 
  of 
  the 
  wings, 
  but 
  also 
  in 
  

   respect 
  of 
  the 
  development 
  of 
  the 
  transverse 
  band. 
  Over 
  30 
  different 
  

   colour 
  variations 
  have 
  been 
  described 
  but 
  appear 
  to 
  fall 
  mainly 
  into 
  

   four 
  distinct 
  types, 
  namely 
  : 
  — 
  

  

  " 
  1. 
  With 
  the 
  primary 
  wings 
  red 
  and 
  red-brown 
  with 
  green 
  outer 
  

  

  margins, 
  giving 
  us 
  the 
  type 
  tilicB. 
  

   " 
  2. 
  With 
  the 
  ground 
  colour 
  entirely 
  green, 
  or 
  with 
  a 
  certain 
  

   amount 
  of 
  pink 
  suffusion 
  on 
  green, 
  particularly 
  against 
  the 
  

   median 
  band, 
  ab. 
  virescens. 
  

   " 
  3. 
  Grey 
  or 
  fawn-grey 
  ground 
  colour, 
  ab. 
  pallida. 
  

   " 
  4. 
  With 
  the 
  ground 
  colour 
  entirely 
  red 
  and 
  red-brown, 
  without 
  

  

  any 
  of 
  the 
  green 
  coloration, 
  ab. 
  brunnea. 
  

   " 
  The 
  two 
  commonest 
  are 
  the 
  red 
  or 
  red-brown, 
  with 
  the 
  green 
  

   outer 
  margins, 
  and 
  ab. 
  virescem. 
  The 
  rarest 
  aberration 
  is 
  brunnea. 
  

   " 
  The 
  variations 
  of 
  the 
  band 
  are 
  mostly 
  easy 
  to 
  follow, 
  with 
  

   one 
  or 
  two 
  exceptions. 
  The 
  commonest 
  is 
  when 
  the 
  median 
  

   band 
  resolves 
  itself 
  into 
  a 
  central 
  spot, 
  ab. 
  centripuncta. 
  This 
  

   holds 
  good 
  for 
  all 
  four 
  colour 
  variations, 
  so 
  does 
  ab. 
  costipiincta 
  

   (where 
  only 
  the 
  costal 
  part 
  of 
  the 
  band 
  exists), 
  and 
  ab. 
  maryine- 
  

   pimcta, 
  where 
  only 
  the 
  marginal 
  part 
  of 
  the 
  band 
  remains, 
  also 
  ab. 
  

   obsoleta, 
  where 
  the 
  band 
  is 
  entirely 
  obsolete. 
  Where, 
  however, 
  the 
  

   band 
  is 
  broken 
  into 
  two 
  distinct 
  parts, 
  namely, 
  costal 
  and 
  inner 
  

   marginal 
  portions 
  on 
  the 
  pale 
  grey 
  or 
  fawn-grey 
  variety, 
  namely, 
  

   pallida, 
  it 
  is 
  known 
  as 
  ab. 
  bipunctata. 
  This 
  was 
  the 
  name 
  given 
  to 
  

   the 
  variety 
  in 
  question 
  by 
  Clark. 
  The 
  illustration 
  and 
  description, 
  

   however, 
  applies 
  to 
  the 
  insect 
  with 
  the 
  pale 
  grey 
  or 
  fawn-grey 
  

   ground, 
  where 
  the 
  costal 
  portion 
  of 
  the 
  band 
  does 
  commence 
  at 
  the 
  

   costa. 
  Tutt, 
  however, 
  applied 
  this 
  name 
  to 
  all 
  pale 
  grey 
  or 
  fawn- 
  

   grey 
  varieties 
  with 
  the 
  band 
  broken 
  in 
  two 
  portions, 
  whether 
  the 
  

   upper 
  portion 
  started 
  at 
  the 
  costa 
  or 
  otherwise. 
  Where, 
  however, 
  

   the 
  band 
  is 
  broken 
  into 
  two 
  parts 
  with 
  the 
  ground 
  colour 
  of 
  red 
  or 
  

   red-brown, 
  with 
  green 
  outer 
  margins, 
  we 
  have 
  an 
  insect 
  known 
  as 
  

   ab. 
  )naculata, 
  likewise 
  where 
  the 
  ground 
  colour 
  is 
  green, 
  this 
  name 
  

   having 
  been 
  applied 
  by 
  Wallengren 
  ; 
  but 
  there 
  is 
  still 
  further 
  com- 
  

   plication 
  in 
  regard 
  to 
  the 
  naming 
  of 
  the 
  broken 
  banded 
  varieties, 
  

   inasmuch 
  as 
  the 
  type 
  of 
  ab. 
  brunnea 
  is 
  an 
  entirely 
  red 
  or 
  red-brown 
  

   insect 
  with 
  the 
  broken 
  band, 
  the 
  red 
  or 
  red-brown 
  variety 
  with 
  the 
  

   complete 
  median 
  band 
  being 
  known 
  as 
  brunnea-transversa. 
  It 
  is 
  a 
  

   great 
  pity 
  that 
  Wallengren's 
  original 
  name 
  of 
  ab. 
  maculata 
  was 
  not 
  

  

  