﻿HYBRIDISATION 
  IN 
  LEPIDOPTERA. 
  29 
  

  

  There 
  is 
  a 
  slight, 
  but 
  very 
  slight, 
  only 
  just 
  discernible, 
  trace 
  of 
  the 
  

   space 
  between 
  the 
  transverse 
  lines, 
  being 
  more 
  strongly 
  (darkly 
  is 
  

   hardly 
  the 
  word) 
  coloured 
  than 
  the 
  remainder 
  of 
  the 
  wing 
  area, 
  this 
  

   darkening 
  being 
  a 
  marked 
  characteristic 
  of 
  the 
  females 
  of 
  neustria 
  

   where 
  the 
  band 
  is 
  more 
  faintly, 
  but 
  still 
  clearly, 
  continued 
  across 
  the 
  

   hindwing 
  as 
  well, 
  but 
  of 
  this 
  there 
  is 
  no 
  trace 
  in 
  any 
  of 
  the 
  hybrid 
  

   specimens 
  except 
  on 
  one 
  where 
  the 
  outer 
  transverse 
  line 
  is 
  very 
  faintly 
  

   continued 
  on 
  the 
  secondaries 
  ; 
  this 
  continuation 
  of 
  the 
  transverse 
  lines 
  

   is, 
  however, 
  frequently 
  noticeable 
  in 
  castrensis 
  2 
  s. 
  There 
  is 
  no 
  inter- 
  

   mingling 
  of 
  $ 
  coloration 
  or 
  pattern 
  in 
  any 
  of 
  the 
  2 
  specimens, 
  

   the 
  variegated 
  marginal 
  fringe, 
  which 
  many 
  of 
  the 
  specimens 
  show, 
  

   being 
  quite 
  normal 
  to 
  the 
  2 
  s 
  of 
  both 
  the 
  parent 
  species, 
  though 
  more 
  

   strongly 
  marked 
  in 
  neustria. 
  One 
  2 
  is 
  aberrant 
  in 
  having 
  a 
  broad 
  

   longitudinal 
  streak 
  of 
  the 
  pale 
  canary 
  colour 
  of 
  the 
  transverse 
  lines 
  

   on 
  the 
  right 
  wing 
  only, 
  and 
  it 
  is 
  perhaps 
  significant 
  that 
  this 
  streak 
  

   is 
  interrupted 
  on 
  the 
  area 
  between 
  the 
  transverse 
  lines. 
  The 
  1902 
  

   brood 
  produed 
  6 
  $ 
  s 
  and 
  16 
  $ 
  s. 
  Of 
  these, 
  the 
  $ 
  s 
  differ 
  considerably 
  

   among 
  themselves 
  and 
  also 
  from 
  the 
  previous 
  brood. 
  The 
  largest 
  

   is 
  a 
  very 
  fine 
  specimen 
  of 
  the 
  last 
  year's 
  type, 
  but 
  much 
  more 
  strongly 
  

   and 
  richly 
  marked. 
  There 
  is 
  one 
  other 
  weakly-marked 
  specimen 
  

   of 
  this 
  type, 
  but 
  the 
  others 
  differ 
  greatly. 
  One 
  is 
  of 
  a 
  suffused 
  ochre- 
  

   brown, 
  which 
  is 
  not 
  uncommon 
  in 
  specimens 
  of 
  castrensis, 
  and 
  is 
  

   occasionally 
  present 
  in 
  males 
  of 
  neustria 
  as 
  well 
  ; 
  both 
  the 
  bars 
  

   and 
  the 
  outer 
  dark 
  shading 
  of 
  castrensis 
  are 
  very 
  faintly 
  in 
  evidence, 
  

   and 
  the 
  hindwings, 
  though 
  of 
  a 
  slightly 
  different 
  tint, 
  are 
  not 
  markedly 
  

   darker 
  than 
  the 
  forewings, 
  the 
  remaining 
  three 
  specimens 
  are 
  also 
  of 
  

   this 
  type 
  as 
  regards 
  form 
  and 
  markings 
  but 
  very 
  much 
  darker, 
  being 
  

   of 
  a 
  rich 
  umber- 
  brown, 
  one 
  of 
  them 
  being 
  exceedingly 
  dark, 
  their 
  hind- 
  

   wings 
  also 
  being 
  noticeably 
  darker 
  than 
  the 
  primaries. 
  As 
  regards 
  

   coloration 
  and 
  variation 
  these 
  last 
  four 
  seem 
  certainly 
  to 
  be 
  

   following 
  castrensis 
  rather 
  than 
  neustria. 
  The 
  16 
  ? 
  s, 
  like 
  the 
  $ 
  s, 
  

   show 
  much 
  variation 
  among 
  themselves, 
  about 
  half 
  of 
  them 
  

   approximating 
  to 
  last 
  year's 
  brood, 
  one 
  of 
  these, 
  however, 
  has 
  a 
  pale 
  

   unicolorous 
  marginal 
  fringe. 
  The 
  other 
  specimens 
  have, 
  to 
  a 
  varying 
  

   extent, 
  lost 
  the 
  pale 
  transverse 
  bars, 
  in 
  some 
  instances 
  entirely, 
  

   and 
  they 
  vary 
  in 
  regard 
  to 
  their 
  uniform 
  coloration 
  from 
  the 
  darkest 
  

   umber-brown, 
  to 
  a 
  pale 
  dull 
  brownish 
  ochre 
  ; 
  in 
  two 
  specimens 
  

   there 
  is 
  a 
  tendency 
  to 
  be 
  thinly 
  scaled, 
  after 
  the 
  fashion 
  of 
  females 
  

   of 
  franconica 
  (Bacot). 
  

  

  Selmons 
  records 
  (Soc. 
  Knt., 
  1894, 
  p. 
  156) 
  pairings 
  between 
  M. 
  

   alpicola 
  $ 
  x 
  castrensis 
  £ 
  , 
  and 
  M. 
  castrensis 
  $ 
  xal/u'cola 
  2 
  ; 
  the 
  

   eggs 
  proved 
  infertile. 
  

  

  4. 
  Lasiocampa 
  hybr. 
  wagneri 
  (querciis 
  $ 
  xtrifolii 
  y 
  ). 
  — 
  Standfuss 
  

   records 
  (Handbuch, 
  &c.) 
  that 
  Wagner 
  obtained 
  a 
  pairing 
  between 
  

   Lasiocampa 
  querciis 
  Xtrifolii 
  2 
  from 
  which 
  fertile 
  eggs 
  and 
  larva 
  1 
  were 
  

   obtained, 
  only 
  one 
  2 
  > 
  however, 
  reaching 
  the 
  imaginal 
  stale. 
  He 
  gives 
  

   no 
  further 
  particulars. 
  

  

  Geometrides. 
  — 
  Hybridity 
  among 
  the 
  Geometrids 
  is 
  rare, 
  rather, 
  

   one 
  suspects, 
  from 
  want 
  of 
  experiment 
  than 
  any 
  other 
  reason. 
  Those 
  

   already 
  recorded 
  are 
  as 
  follows 
  : 
  — 
  

  

  1. 
  Zonosoma 
  hybr. 
  Brighton] 
  (orbicularia 
  " 
  xlinearia 
  2 
  ).— 
  In 
  1859, 
  

   Cooke 
  paired 
  a 
  tf 
  Zonosoma 
  orbicularia 
  with 
  a 
  y 
  Z. 
  linearia 
  

   (tri(incaria) 
  ; 
  eight 
  eggs 
  only 
  were 
  laid, 
  these 
  hatched 
  in 
  due 
  course. 
  

  

  