﻿60 
  BRITISH 
  LEPIDOPTERA. 
  

  

  Hamling, 
  to 
  whom 
  we 
  are 
  indebted 
  for 
  these 
  experiments, 
  regrets 
  

   that 
  he 
  did 
  not 
  notice 
  the 
  division 
  of 
  the 
  sexes 
  (For 
  further 
  details, 
  see 
  

   Transactions 
  of 
  the 
  City 
  of 
  London 
  Entomological 
  and 
  Natural 
  History 
  

   Society, 
  1903, 
  pp. 
  43 
  et 
  seq.). 
  

  

  11a. 
  Gonodontis 
  nigra 
  $ 
  x 
  nigra 
  $ 
  . 
  — 
  A 
  black 
  2 
  G. 
  bidentata, 
  

   captured 
  in 
  1903, 
  produced 
  about 
  66 
  per 
  cent, 
  of 
  nigra, 
  and 
  two 
  inbred 
  

   pairings 
  of 
  nigra 
  from 
  these 
  have 
  this 
  year 
  produced 
  80 
  per 
  cent, 
  of 
  

   nigra 
  (Porritt, 
  in 
  litt., 
  June 
  23rd, 
  1905). 
  

  

  18. 
  Larentia 
  nubilata 
  (multistrigaria) 
  $ 
  xnubilata 
  ? 
  . 
  — 
  (a) 
  Ova, 
  

   to 
  the 
  number 
  of 
  104, 
  obtained 
  March, 
  1904, 
  from 
  nubilata 
  (the 
  melanic 
  

   form 
  of 
  L. 
  multistrigaria) 
  parents. 
  The 
  number 
  of 
  larvre 
  pupated 
  = 
  

   59. 
  The 
  brood 
  divided 
  as 
  follows: 
  — 
  Typical 
  form 
  13 
  = 
  8 
  c? 
  s 
  and 
  5 
  

  

  $s; 
  nubilata 
  32 
  = 
  17 
  c? 
  s 
  and 
  15 
  ?s; 
  14 
  pupa3 
  failed 
  to 
  emerge 
  

   (Hamling, 
  in 
  litt.). 
  (j3) 
  A 
  wild 
  pairing 
  (at 
  Skelmanthorpe) 
  in 
  1903, 
  of 
  

   nubilata 
  xnubilata, 
  resulted 
  in 
  9 
  $ 
  and 
  8 
  $ 
  nubilata, 
  4 
  $ 
  and 
  2 
  $ 
  

   multistrigaria, 
  and 
  2 
  2 
  s, 
  dull 
  smoky 
  in 
  tint, 
  with 
  the 
  markings 
  

   almost 
  obliterated 
  (Morley, 
  in 
  litt.). 
  (y) 
  Captured 
  black 
  females 
  in 
  

   1903, 
  near 
  Huddersfield, 
  produced 
  about 
  half 
  nubilata, 
  half 
  typical. 
  

   Black 
  pairings 
  from 
  these 
  produced 
  about 
  75 
  per 
  cent, 
  black. 
  Black 
  

   pairings 
  from 
  these 
  (but 
  mixed 
  with 
  larvas 
  from 
  captured 
  black 
  

   moths), 
  again 
  produced 
  about 
  70-75 
  per 
  cent, 
  black, 
  but 
  no 
  data 
  

   available 
  as 
  to 
  what 
  proportion 
  were 
  from 
  the 
  captured, 
  and 
  what 
  

   from 
  the 
  inbred, 
  nubilata 
  (Porritt, 
  in 
  litt., 
  June 
  23rd, 
  1905). 
  

  

  19. 
  Venusia 
  cambrica 
  ab. 
  bradyi. 
  — 
  Eggs 
  from 
  several 
  dark 
  captured 
  

  

  2 
  s, 
  3 
  s 
  of 
  course 
  unknown. 
  Only 
  13 
  pupa? 
  obtained, 
  from 
  these 
  

   7 
  moths 
  emerged, 
  all 
  dark 
  lead-coloured 
  (Porritt, 
  in 
  litt., 
  June 
  23rd, 
  

   1905). 
  

  

  IV. 
  Crossing 
  of 
  typical 
  form 
  with 
  aberration 
  trying 
  to 
  set 
  up 
  

  

  LOCAL 
  RACE. 
  

  

  In 
  the 
  western 
  parts 
  of 
  England 
  and 
  elsewhere 
  Boarmia 
  repan- 
  

   data 
  passes 
  insensibly 
  by 
  various 
  gradations 
  into 
  a 
  well-marked 
  banded 
  

   form, 
  which 
  is 
  evidently 
  in 
  these 
  localities 
  attempting 
  to 
  supplant 
  

   the 
  type. 
  The 
  banded 
  aberration 
  is 
  of 
  the 
  greatest 
  rarity 
  in 
  most 
  

   localities. 
  Similar 
  local 
  aberrations 
  are 
  set 
  up 
  in 
  the 
  banded 
  form 
  of 
  

   Cidaria 
  sufumata 
  in 
  Kent 
  and 
  Yorkshire, 
  and 
  possibly 
  parallel 
  

   developments 
  have 
  taken, 
  or 
  are 
  taking, 
  place 
  in 
  many 
  other 
  

   species. 
  These 
  forms 
  are 
  possibly 
  quite 
  analogous 
  in 
  their 
  development 
  

   with 
  those 
  last 
  considered, 
  but 
  the 
  racial 
  tendency 
  exhibits 
  different 
  

   characters 
  for 
  protective 
  purposes. 
  The 
  only 
  recorded 
  experimental 
  

   crossings 
  that 
  we 
  can 
  trace 
  are 
  the 
  following 
  : 
  — 
  

  

  1. 
  Boarmia 
  repandata 
  £ 
  x 
  conversaria 
  2 
  . 
  — 
  (a) 
  A 
  large 
  brood 
  of 
  

   moths 
  reared 
  from 
  the 
  eggs 
  of 
  a 
  pair 
  of 
  normal 
  repandata 
  contained 
  

  

  3 
  $ 
  and 
  1 
  5 
  conversaria. 
  This 
  £ 
  was 
  paired 
  with 
  a 
  wild 
  $■ 
  repandata, 
  

   and 
  produced 
  10 
  $ 
  and 
  18 
  $ 
  repandata 
  and 
  4 
  $ 
  and 
  2 
  $ 
  conversaria. 
  

   Intermediate 
  forms 
  were 
  entirely 
  absent 
  (Standfuss, 
  Handbucli, 
  etc., 
  

   p. 
  317). 
  (Z 
  3 
  ) 
  From 
  Bristol 
  eggs 
  laid 
  by 
  conversaria 
  $ 
  ( 
  $ 
  possibly 
  typical) 
  ; 
  

   19 
  imagines 
  reared 
  consisted 
  of 
  10 
  repandata 
  and 
  9 
  conversaria 
  (South, 
  

   Proc. 
  8th. 
  Lond. 
  Ent. 
  Soc, 
  1885, 
  p. 
  43, 
  Trans. 
  Ent. 
  Soc. 
  Lond., 
  1887, 
  

   p. 
  xliv). 
  (y) 
  In 
  1903, 
  I 
  reared 
  a 
  brood 
  from 
  a 
  wild 
  Devon 
  crossing 
  of 
  

   repandata 
  X 
  conversaria 
  ; 
  about 
  ten 
  per 
  cent, 
  only 
  were 
  conversaria. 
  

   From 
  these 
  I 
  paired 
  $ 
  conversaria 
  with 
  ? 
  repandata, 
  and 
  in 
  the 
  result 
  

   I 
  obtained 
  about 
  40 
  per 
  cent, 
  conversaria, 
  whilst 
  from 
  another 
  pairing 
  

   of 
  $ 
  repandata 
  and 
  the 
  ? 
  conversaria, 
  I 
  got 
  a 
  very 
  similar 
  result. 
  

  

  