﻿MONGRELISATION 
  IN 
  LEPIDOPTERA. 
  47 
  

  

  (reared 
  in 
  1901) 
  resembled 
  filigrammuria 
  in 
  appearance, 
  and 
  autumnata 
  in 
  

   size. 
  The 
  imagines 
  were 
  healthy, 
  a 
  ^ 
  and 
  $ 
  of 
  the 
  mongrels 
  were 
  paired, 
  

   and 
  from 
  these 
  2^ 
  s 
  and 
  2 
  ? 
  s 
  were 
  reared, 
  in 
  1902, 
  smaller 
  than 
  the 
  

   parents, 
  about 
  the 
  size 
  of 
  filigramm 
  aria, 
  and 
  hardly 
  so 
  strongly 
  marked. 
  

   A 
  pairing 
  was 
  also 
  obtained 
  between 
  a 
  ? 
  of 
  the 
  mongrels 
  and 
  a 
  J 
  

   autumnata, 
  the 
  eggs 
  were 
  fertile, 
  and 
  larvae 
  hatched, 
  but 
  no 
  imagines 
  

   were 
  reared 
  (Mera). 
  (Z 
  3 
  ) 
  Some 
  200 
  ova 
  were 
  laid, 
  about 
  100 
  kept, 
  and 
  

   from 
  these 
  11 
  specimens 
  were 
  reared, 
  7 
  $ 
  s 
  and 
  4 
  $ 
  s 
  (Allen), 
  

   (y) 
  112 
  ova 
  obtained. 
  About 
  60 
  hatched, 
  but 
  less 
  than 
  half 
  of 
  these 
  

   arrived 
  at 
  the 
  pupal 
  state, 
  and 
  only 
  7 
  moths 
  emerged, 
  all 
  $ 
  s, 
  average 
  

   size 
  rather 
  small, 
  and 
  one 
  a 
  cripple. 
  4 
  pale 
  specimens 
  strongly 
  

   favour 
  autumnata, 
  one 
  or 
  two 
  being 
  whiter 
  than 
  any 
  known 
  fdvjram- 
  

   maria, 
  the 
  3 
  dark 
  ones 
  are 
  more 
  intermediate, 
  but 
  only 
  one 
  could 
  be 
  

   called 
  fairly 
  representative 
  of 
  the 
  normal 
  ftligrammaria 
  (Prout). 
  

  

  8. 
  Oporabia 
  autumnata 
  $ 
  x 
  filigrammaria 
  $ 
  . 
  — 
  About 
  70 
  ova 
  laid, 
  

   from 
  which 
  28 
  imagines 
  were 
  reared, 
  18 
  $ 
  s 
  and 
  10 
  $ 
  s. 
  Of 
  these 
  

   17 
  c? 
  s 
  emerged 
  before 
  a 
  single 
  ? 
  . 
  The 
  specimens 
  were 
  rather 
  small 
  

   (perhaps 
  due 
  to 
  unfavourable 
  rearing 
  conditions). 
  Many 
  would 
  pass 
  

   for 
  undoubted 
  autumnata, 
  others 
  were 
  of 
  a 
  nondescript 
  appearance, 
  

   with 
  wavy 
  lines 
  crossing 
  the 
  wings 
  and 
  more 
  or 
  less 
  obliterating 
  the 
  

   markings 
  (Allen). 
  

  

  9. 
  Lasiocampa 
  quercus 
  $ 
  x 
  meridionalis 
  $ 
  .* 
  — 
  (a) 
  3 
  $ 
  s 
  and 
  4?s, 
  the 
  

   former 
  quite 
  of 
  the 
  broad-banded 
  English 
  type 
  ; 
  the 
  $ 
  s 
  also 
  show 
  

   this 
  broadening 
  of 
  the 
  transverse 
  bands. 
  The 
  larvae 
  showed 
  the 
  

   predominant 
  characteristics 
  of 
  the 
  English 
  quercus 
  strain 
  (Bacot 
  

   coll.). 
  (Q 
  4 
  $ 
  s 
  and 
  8 
  $ 
  s, 
  the 
  offspring 
  distinctly 
  like 
  British 
  

   qu 
  rem 
  in 
  both 
  sexes, 
  the 
  $ 
  s 
  with 
  the 
  characteristic 
  tendency 
  to 
  wider 
  

   bands, 
  the 
  $ 
  s 
  less 
  red 
  and 
  more 
  yellow 
  than 
  the 
  ? 
  parent 
  (Warburg 
  

   coll.). 
  (7) 
  11 
  $ 
  s, 
  the 
  offspring 
  small; 
  the 
  outer 
  marginal 
  area 
  weak 
  

   in 
  colour 
  compared 
  with 
  the 
  $ 
  parent; 
  the 
  transverse 
  bands 
  narrow 
  

   (Warburg 
  coll.). 
  

  

  10. 
  Lasiocampa 
  meridionalis 
  $ 
  x 
  viburni 
  2 
  • 
  — 
  (a) 
  The 
  3 
  s 
  (30) 
  are 
  

   scarcely 
  distinguishable 
  from 
  the 
  J 
  parents 
  (the 
  progeny 
  is 
  from 
  four 
  

   pairings) 
  ; 
  the 
  ? 
  s 
  are 
  distinctly 
  yellower 
  than 
  the 
  $ 
  parents, 
  which 
  

   are 
  more 
  than 
  usually 
  red 
  even 
  for 
  viburni 
  (Warburg 
  coll.). 
  (/*) 
  5 
  $ 
  s, 
  all 
  

   showing 
  rather 
  more 
  than 
  a 
  tendency 
  to 
  the 
  widening 
  of 
  the 
  transverse 
  

   band 
  of 
  fore- 
  and 
  hindwings 
  ; 
  two 
  have 
  them 
  somewhat 
  wider 
  than 
  any 
  

   viburni 
  examined, 
  and 
  in 
  this 
  respect 
  approach 
  British 
  quercus 
  (Bacot 
  

   coll.). 
  The 
  great 
  interest 
  in 
  this 
  cross 
  lies 
  in 
  the 
  fact 
  that, 
  in 
  every 
  

   case, 
  the 
  mongrel 
  larva* 
  divided 
  into 
  two 
  series 
  following 
  the 
  larval 
  

   forms 
  of 
  the 
  parent 
  (white-haired 
  or 
  brown-haired). 
  

  

  11. 
  Lasiocampa 
  sicula 
  $ 
  x 
  mkridionalis 
  $ 
  . 
  —(a) 
  3 
  $ 
  s 
  and 
  1 
  J 
  : 
  the 
  

   ground 
  colour 
  rather 
  nearer 
  the 
  darker 
  tint 
  of 
  meridional/'* 
  than 
  the 
  more 
  

   russet 
  hue 
  oi.sici.da; 
  the 
  transverse 
  band 
  of 
  forewing 
  definite 
  and 
  

   narrow 
  ; 
  the 
  hindwing 
  with 
  the 
  orange 
  marginal 
  area 
  of 
  sicula 
  altered 
  

   to 
  the 
  brown 
  marginal 
  area 
  and 
  narrow 
  yellow 
  transverse 
  hand 
  of 
  

   meridionalis 
  ; 
  the 
  $ 
  retains 
  the 
  russet 
  tint 
  of 
  sicula, 
  but 
  has 
  noi 
  the 
  

   distinct 
  pale 
  outer 
  marginal 
  area 
  of 
  that 
  form 
  (Bacol 
  coll.). 
  (/3) 
  *_! 
  f 
  g 
  

   and 
  1 
  5 
  emerged 
  the 
  first 
  year, 
  the 
  males 
  of 
  the 
  russet 
  hue 
  of 
  sicula, 
  hut 
  

   the 
  hind 
  marginal 
  area, 
  of 
  hindwing 
  surrounded 
  with 
  brown 
  as 
  m 
  

  

  * 
  For 
  details 
  of 
  the 
  crossings, 
  characters 
  (larval 
  ami 
  imaginal) 
  of 
  parents, 
  

   see 
  anted, 
  hi., 
  pp. 
  34 
  ct 
  *<■</.; 
  But. 
  Record, 
  xiii.. 
  pp. 
  L14 
  et 
  >./.. 
  and 
  pp. 
  237 
  

  

  