﻿20 
  BRITISH 
  LEPIDOPTERA. 
  

  

  hilaris 
  ? 
  being 
  equally 
  fruitful. 
  From 
  a 
  crossing 
  of 
  sordid 
  a 
  $ 
  x 
  

   hilaris 
  2 
  , 
  produced 
  eggs 
  of 
  which 
  about 
  75 
  per 
  cent, 
  hatched, 
  whilst 
  

   from 
  a 
  pairing 
  of 
  hilaris 
  $ 
  x 
  sordida 
  2 
  only 
  about 
  16 
  per 
  cent, 
  of 
  the 
  

   eggs 
  gave 
  larvae 
  ; 
  from 
  a 
  crossing 
  of 
  hilaris 
  $ 
  x 
  luctuosa 
  2 
  > 
  a 
  few 
  

   weakly 
  larva? 
  only 
  were 
  produced. 
  

  

  5. 
  Spilosoma 
  hybr. 
  seileri, 
  Caradja 
  (luctuosa 
  £ 
  x 
  sordida 
  2 
  ) 
  

   (Iris, 
  1898, 
  pi. 
  vi., 
  figs. 
  1-6). 
  — 
  This 
  crossing 
  succeeded 
  in 
  five 
  cases, 
  

   the 
  egg-batches 
  producing 
  respectively 
  3, 
  3, 
  7, 
  48 
  and 
  71 
  eggs. 
  From 
  

   these 
  only 
  15 
  $ 
  s 
  and 
  27 
  ? 
  s 
  reached 
  the 
  imaginal 
  stage. 
  In 
  pattern 
  

   and 
  the 
  outline 
  of 
  the 
  wings, 
  the 
  hybrid 
  is 
  exactly 
  intermediate 
  

   between 
  the 
  parents. 
  The 
  ground 
  colour 
  is 
  grey-brown 
  (darker 
  than 
  

   in 
  luctuosa), 
  the 
  yellowish 
  scales, 
  always 
  plentiful 
  in 
  latter, 
  more 
  

   scanty, 
  appearing 
  along 
  anterior 
  and 
  exterior 
  margins 
  of 
  forewings. 
  

   The 
  2 
  s 
  rather 
  more 
  thinly 
  scaled 
  than 
  luctuosa 
  2 
  s, 
  and 
  with 
  much 
  

   less 
  transparent 
  wings. 
  The 
  general 
  arrangement 
  of 
  the 
  wing-pattern 
  

   inclining 
  to 
  that 
  of 
  sordida, 
  except 
  that 
  all 
  the 
  spots 
  and 
  stripes 
  are 
  

   much 
  more 
  sharply 
  marked 
  (nearly 
  as 
  in 
  luctuosa). 
  The 
  forewings 
  

   with 
  three 
  rows 
  of 
  equidistant, 
  parallel 
  (not 
  sinnately-divergent 
  as 
  in 
  

   luctuosa) 
  spots 
  proceeding 
  from 
  costa, 
  a 
  fourth, 
  shorter, 
  row 
  arising 
  

   from 
  apex, 
  and 
  running 
  obliquely 
  towards 
  outer 
  of 
  the 
  three 
  parallel 
  

   rows 
  ; 
  five 
  black 
  spots 
  along 
  outer 
  margin. 
  The 
  hindwings 
  darker 
  

   than 
  the 
  forewings, 
  with 
  distinct 
  discal 
  spot, 
  and 
  black 
  longitudinal 
  

   stripes 
  from 
  base 
  of 
  wing 
  to 
  the 
  seven 
  marginal 
  spots, 
  as 
  in 
  luctuosa. 
  

   There 
  is, 
  however, 
  considerable 
  variation, 
  some 
  specimens 
  inclining 
  to 
  

   luctuosa, 
  the 
  majority 
  to 
  sordida. 
  The 
  hybrids 
  pair 
  freely 
  ; 
  five 
  fertile 
  

   pairings 
  produced 
  an 
  average 
  of 
  180 
  eggs. 
  Crossings 
  between 
  sordida 
  

   $ 
  X 
  seileri 
  2 
  and 
  luctuosa 
  $ 
  x 
  seileri 
  $ 
  were 
  also 
  fruitful 
  (only 
  

   about 
  17 
  per 
  cent 
  of 
  infertile 
  eggs), 
  whilst 
  crossings 
  between 
  seileri 
  

   S 
  X 
  luctuosa 
  2 
  and 
  seileri 
  $ 
  x 
  sordida 
  2 
  resulted 
  largely 
  in 
  infertile 
  

   eggs, 
  only 
  13 
  eggs 
  (out 
  of 
  four 
  batches) 
  producing 
  larvae, 
  all 
  of 
  which 
  

   died 
  before 
  the 
  1st 
  moult. 
  A 
  pairing 
  of 
  rustica 
  $ 
  x 
  seileri 
  2 
  resulted 
  

   in 
  only 
  a 
  few 
  fertile 
  eggs, 
  only 
  one 
  larva 
  pupating. 
  

  

  Notodontides.— 
  The 
  hybridisation 
  of 
  Notodontids 
  has 
  been 
  rather 
  

   more 
  frequent. 
  Those 
  recorded 
  are 
  as 
  follows 
  : 
  — 
  

  

  1. 
  Cerura 
  hybr. 
  g-uillemoti 
  (vinula 
  $ 
  x 
  erminea 
  2)- 
  — 
  Hybrids 
  of 
  

   Centra 
  vinula 
  x 
  erminea 
  were 
  obtained 
  by 
  Serisie, 
  a 
  pairing 
  between 
  C. 
  

   vinula 
  $ 
  and 
  C. 
  erminea 
  2 
  occurring 
  May 
  28th, 
  1854, 
  the 
  2 
  laying 
  about 
  

   a 
  hundred 
  eggs 
  of 
  which 
  ten 
  only 
  emerged 
  in 
  fifteen 
  days. 
  Guillemot 
  

   notes 
  (Ann. 
  Soc. 
  Ent. 
  Fr., 
  1856, 
  pp. 
  29 
  et 
  seq.) 
  the 
  larva? 
  as 
  being 
  

   nearer 
  erminea 
  than 
  vinula. 
  All 
  the 
  larva? 
  safely 
  pupated, 
  the 
  pupa? 
  

   appeared 
  to 
  be 
  nearer 
  those 
  of 
  vinula 
  than 
  erminea. 
  From 
  the 
  pupa?, 
  

   seven 
  (6 
  $ 
  and 
  1 
  2 
  ) 
  emerged 
  at 
  the 
  end 
  of 
  April, 
  1855, 
  and 
  three 
  (3 
  

   J 
  ) 
  on 
  May 
  7th-8th, 
  1856. 
  These 
  were 
  nearer 
  C. 
  vinula, 
  but 
  two 
  of 
  

   the 
  latest 
  to 
  emerge 
  were 
  pale 
  and 
  weakly 
  marked. 
  One 
  of 
  the 
  more 
  

   typical 
  $ 
  s 
  is 
  figured 
  (op. 
  cit., 
  pi. 
  i., 
  fig. 
  2). 
  Opening 
  the 
  ? 
  hybrid 
  

   and 
  a 
  2 
  erminea 
  that 
  emerged 
  at 
  the 
  same 
  time, 
  the 
  body 
  of 
  the 
  lattei 
  

   was 
  found 
  to 
  contain, 
  as 
  usual, 
  a 
  large 
  number 
  of 
  eggs 
  ; 
  in 
  the 
  hybrid 
  

   only 
  22 
  eggs, 
  ill-formed, 
  depressed, 
  atrophied, 
  and 
  bathed 
  in 
  a 
  clear 
  

   fluid, 
  and 
  apparently 
  quite 
  incapable 
  of 
  being 
  fertilised. 
  

  

  2. 
  Notodonta 
  hybr. 
  dubia 
  (torra 
  $ 
  x 
  dromedarius 
  2 
  )• 
  — 
  Standfuss 
  

   notes 
  (Handbuch, 
  etc., 
  p. 
  59) 
  that 
  a 
  few 
  years 
  ago, 
  hybrids 
  between 
  

   Notodonta 
  torra 
  $ 
  x 
  dromedarius 
  2 
  > 
  were 
  obtained, 
  but 
  that 
  the 
  

   hybrid 
  is 
  not 
  known 
  to 
  him. 
  It 
  is, 
  however, 
  one 
  of 
  the 
  species 
  that 
  

  

  