﻿52 
  

  

  BRITISH 
  LEPLDOPTERA. 
  

  

  [Note. 
  — 
  A 
  few 
  (3 
  s 
  s 
  and 
  2 
  ? 
  s) 
  damaged 
  and 
  crippled 
  specimens 
  could 
  not 
  be 
  

   used 
  for 
  the 
  study 
  of 
  this 
  character. 
  ] 
  

  

  It 
  is 
  remarkable 
  how 
  true 
  this 
  brood 
  follows 
  the 
  individual 
  parents. 
  

   Only 
  three 
  or 
  four 
  (g 
  s) 
  are 
  suggestive 
  of 
  lubricipeda, 
  the 
  specimens, 
  

   with 
  these 
  exceptions, 
  being 
  of 
  -the 
  zatima 
  type, 
  though 
  not 
  equally 
  

   dark. 
  The 
  independence 
  of 
  fore- 
  and 
  hind 
  wings 
  with 
  regard 
  to 
  pro- 
  

   gression 
  from 
  or 
  reversion 
  towards 
  the 
  lubricipeda 
  form 
  is 
  to 
  be 
  noted. 
  

   Also 
  the 
  fact 
  that 
  in 
  the 
  only 
  point 
  of 
  difference 
  noted 
  between 
  $ 
  

   and 
  2 
  parents 
  there 
  appears 
  to 
  be 
  a 
  marked 
  tendency 
  to 
  cross 
  

   inheritance, 
  i.e., 
  $ 
  offspring 
  following 
  2 
  , 
  and 
  vice 
  versa. 
  (f) 
  Four 
  

   pairings 
  were 
  obtained, 
  but, 
  owing 
  to 
  neglect 
  in 
  larval 
  stage, 
  com- 
  

   parative 
  failure 
  occurred 
  in 
  three 
  instances, 
  and 
  total 
  failure 
  in 
  the 
  

   other. 
  In 
  one 
  pairing, 
  between 
  an 
  extra 
  dark 
  $ 
  and 
  2 
  , 
  still 
  further 
  

   darkening 
  was 
  exhibited 
  in 
  the 
  few 
  specimens 
  reared, 
  a 
  few 
  of 
  the 
  

   specimens 
  having 
  the 
  buff 
  areas 
  reduced 
  considerably 
  more 
  than 
  in 
  

   either 
  parent 
  (or 
  any 
  specimen 
  of 
  the 
  brood 
  from 
  which 
  they 
  were 
  

   selected). 
  From 
  the 
  two 
  other 
  pairings 
  — 
  (1) 
  a 
  dark 
  $ 
  and 
  pale 
  2 
  , 
  

   and 
  (2) 
  an 
  intermediate 
  $ 
  and 
  a 
  normal 
  zatima 
  2 
  , 
  both 
  darker 
  and 
  

   paler 
  forms 
  were 
  produced, 
  but 
  in 
  neither 
  case 
  are 
  the 
  offspring 
  paler 
  

   than 
  the 
  parents 
  (Bacot). 
  

  

  2. 
  Spilosoma 
  lubricipeda 
  S 
  X 
  zatima 
  2 
  . 
  — 
  (a) 
  In 
  the 
  spring 
  of 
  

   1891, 
  a 
  pairing 
  of 
  this 
  cross 
  resulted 
  in 
  the 
  2 
  laying 
  about 
  500 
  ova. 
  

   Only 
  part 
  retained, 
  which 
  resulted 
  in 
  160 
  imagines 
  in 
  1892, 
  of 
  which 
  

   about 
  one-third 
  were 
  zatima, 
  and 
  one-third 
  intermedia 
  (Harrison, 
  Proc. 
  

   Ent. 
  Soc. 
  London, 
  1892, 
  p. 
  xxix). 
  (j3) 
  In 
  April, 
  1889, 
  Burckhardt 
  

   obtained 
  eggs 
  of 
  this 
  cross, 
  breeding 
  in 
  July" 
  a 
  number 
  of 
  typical 
  

   lubricipeda, 
  intermedia 
  and 
  zatima. 
  In 
  July, 
  1889, 
  a 
  pair 
  of 
  the 
  inter- 
  

   media 
  of 
  this 
  brood 
  copulated, 
  and, 
  in 
  1890, 
  again 
  produced 
  the 
  three 
  

   forms. 
  Of 
  these, 
  pairings 
  were 
  effected, 
  and 
  results 
  obtained 
  as 
  

   follows 
  : 
  — 
  

  

  a. 
  Spilosoma 
  zatima 
  g 
  x 
  lubricipeda 
  2 
  . 
  — 
  Resulted 
  in 
  4 
  lubricipeda, 
  

   2 
  intermedia, 
  3 
  zatima. 
  

  

  p. 
  Spilosoma 
  lubricipeda 
  S 
  X 
  zatima 
  2 
  ■ 
  — 
  Resulted 
  in 
  11 
  zatima. 
  

  

  y. 
  Spilosoma 
  intermedia 
  J 
  X 
  intermedia 
  2 
  • 
  — 
  Gave 
  25 
  lubricipeda, 
  

   15 
  intermedia, 
  35 
  zatima. 
  

  

  S. 
  Spilosoma 
  intermedia 
  J 
  X 
  zatima 
  2 
  • 
  — 
  Gave 
  2 
  lubricipeda, 
  15 
  

   inte 
  r 
  meclia, 
  85 
  zatima. 
  

  

  € 
  . 
  Spilosoma 
  lubricipeda 
  £ 
  x 
  lubricipeda 
  2 
  • 
  — 
  Paired 
  from 
  brood 
  5 
  

   in 
  May, 
  1891, 
  and 
  produced 
  in 
  May, 
  1892, 
  34 
  lubricipeda 
  and 
  1 
  zatima 
  

   (almost 
  deschangei). 
  

  

  3. 
  Spilosoma 
  fasciat 
  a 
  £ 
  x 
  fasciata 
  2- 
  — 
  Specimens, 
  differing 
  some- 
  

   what 
  from 
  the 
  type, 
  in 
  the 
  fasciate 
  conditions 
  of 
  the 
  lines, 
  were 
  selected 
  

   by 
  Jackson 
  and 
  other 
  York 
  lepidopterists, 
  for 
  some 
  years, 
  until, 
  between 
  

   1880 
  and 
  1889, 
  a 
  race 
  was 
  established 
  in 
  which 
  an 
  elongate 
  condition 
  of 
  

   the 
  spots 
  was 
  combined 
  with 
  a 
  tendency 
  to 
  form 
  a 
  central 
  band 
  across 
  

   the 
  fore- 
  and 
  hindwings. 
  This 
  form 
  is 
  referred 
  to 
  by 
  Carrington 
  

   (Entom., 
  xxiii., 
  p. 
  207) 
  ; 
  Porritt 
  (Nat., 
  1889, 
  p. 
  233; 
  Entom., 
  xxiv., 
  

   p. 
  296), 
  South 
  (Entom., 
  xxvi., 
  p. 
  346), 
  Tugwell 
  (Entom., 
  xxvii., 
  

   p. 
  95), 
  etc. 
  By 
  selection, 
  and 
  pairing 
  two 
  marked 
  fasciated 
  examples, 
  

  

  * 
  This 
  domesticated 
  double-brooded 
  condition 
  of 
  a 
  very 
  marked 
  single-brooded 
  

   species 
  has 
  already 
  been 
  noted 
  in 
  the 
  broods 
  reared 
  by 
  Tugwell 
  and 
  Porritt 
  (anted 
  

   pp. 
  50, 
  51). 
  

  

  