﻿MONGRELISATION 
  IN 
  LEPIDOPTERA. 
  

  

  59 
  

  

  No. 
  pupated 
  

  

  1 
  brood 
  

   3 
  broods 
  

  

  '28 
  

   80 
  

  

  No. 
  type 
  bred. 
  

   cf 
  ? 
  

  

  No. 
  fuscata 
  bred. 
  

   S 
  ? 
  

  

  7 
  

   10 
  

  

  7 
  

   31 
  

  

  17 
  

  

  Pupse 
  died. 
  

  

  15 
  

  

  (y) 
  A 
  $ 
  fuscata 
  paired 
  with 
  a 
  2 
  abniptaria, 
  May 
  1905, 
  from 
  Harris' 
  brood 
  

   13a 
  (infra). 
  In 
  August, 
  1905, 
  8 
  $ 
  s 
  and 
  15 
  $ 
  s 
  oi 
  fuscata 
  and 
  3 
  ^" 
  s 
  and 
  

  

  3 
  $ 
  s 
  of 
  abniptaria 
  had 
  emerged 
  (two 
  pupae 
  not 
  yet 
  produced 
  imagines). 
  

  

  13. 
  Hemerophila 
  fuscata 
  $ 
  x 
  fuscata 
  2 
  .- 
  — 
  (a) 
  Paired 
  August 
  12th, 
  

   1904 
  (from 
  brood 
  lly) 
  ; 
  larvae 
  hatched 
  August 
  28th 
  and 
  following 
  days, 
  of 
  

   which 
  57 
  spun 
  up 
  between 
  October 
  11th 
  and 
  November 
  5th. 
  Imagines 
  

   emerged 
  between 
  March 
  24th 
  and 
  May 
  6th, 
  1905 
  as 
  follows: 
  ^s 
  = 
  

   12 
  fuscata, 
  and 
  5 
  abruptaria, 
  2s 
  = 
  16 
  fuscata 
  and 
  6 
  abniptaria. 
  The 
  

   remaining 
  18 
  did 
  not 
  emerge, 
  although 
  the 
  moths 
  formed 
  in 
  the 
  pupae 
  ; 
  

   of 
  these 
  apparently 
  11 
  would 
  have 
  been 
  dark 
  and 
  7 
  pale. 
  The 
  dark 
  $ 
  s 
  

   much 
  larger 
  than 
  those 
  of 
  preceding 
  autumn 
  (Harris, 
  in 
  litt., 
  June 
  

   28th, 
  1905). 
  ((3) 
  A 
  $ 
  and 
  2 
  of 
  the 
  fuscata 
  from 
  this 
  brood 
  were 
  paired 
  

   and 
  fertile 
  eggs 
  resulted 
  ; 
  the 
  larvae 
  fed 
  up 
  and 
  pupated, 
  and 
  the 
  

   imagines 
  emerged 
  as 
  a 
  second 
  brood 
  in 
  August, 
  1905. 
  The 
  67 
  

   imagines 
  bred 
  produced 
  34 
  S" 
  s 
  and 
  33 
  2 
  s, 
  all 
  fuscata, 
  not 
  a 
  light 
  

   specimen 
  among 
  them 
  (10 
  pupae 
  had 
  on 
  September 
  25th 
  not 
  yet 
  produced 
  

   imagines). 
  [N.B. 
  — 
  A 
  g 
  and 
  2 
  light 
  abniptaria 
  of 
  same 
  brood 
  were 
  

   paired, 
  the 
  progeny 
  resulting 
  in 
  nine 
  light 
  $ 
  s 
  and 
  nine 
  light 
  $ 
  s, 
  

   with 
  no 
  fuscata 
  ; 
  whilst 
  three 
  pupae 
  had 
  not 
  changed.] 
  (y) 
  An 
  inbred 
  

   brood 
  this 
  year 
  (1905) 
  produced 
  some 
  20 
  specimens, 
  all 
  of 
  the 
  dark 
  

   chocolate 
  form, 
  not 
  a 
  trace 
  of 
  the 
  ordinary 
  type 
  among 
  them 
  (Porritt, 
  

   in 
  litt., 
  June 
  23rd, 
  1905). 
  

  

  Gonodontis 
  bidentata 
  ab. 
  nigra. 
  — 
  -A 
  batch 
  of 
  146 
  ova 
  laid 
  by 
  a 
  2 
  

   nigra 
  ( 
  $ 
  unknown), 
  taken 
  at 
  Methley, 
  near 
  Leeds, 
  in 
  1900, 
  produced 
  136 
  

   imagines, 
  66 
  being 
  typical, 
  and 
  70 
  nigra, 
  in 
  1901. 
  From 
  this 
  brood 
  

   the 
  following 
  experimental 
  crossings 
  were 
  obtained, 
  viz 
  : 
  — 
  

  

  14. 
  Gonodontis 
  bidentata 
  $ 
  x 
  bidentata 
  2 
  {nigra 
  strain). 
  — 
  Four 
  

   broods 
  bred 
  together. 
  Largely 
  died 
  oft' 
  as 
  larvae, 
  77 
  pupae 
  only 
  resulted; 
  

  

  4 
  emerged 
  in 
  November, 
  1901, 
  3 
  bidentata 
  and 
  1 
  nigra; 
  64 
  in 
  May, 
  1902, 
  

   23 
  nigra, 
  41 
  bidentata. 
  The 
  remainder 
  did 
  not 
  emerge. 
  Total, 
  44 
  

   bidentata, 
  24 
  nigra. 
  

  

  15. 
  Gonodontis 
  bidentata 
  $ 
  x 
  nigra 
  2 
  (from 
  same 
  brood). 
  — 
  Three 
  

   broods 
  kept 
  together. 
  Only 
  60 
  pupated. 
  Two 
  nigra 
  emerged 
  in 
  

   December, 
  1901, 
  and 
  23 
  nigra 
  and 
  13 
  bidentata 
  in 
  May, 
  1902." 
  The 
  

   remainder 
  did 
  not 
  emerge. 
  Total, 
  25 
  nigra, 
  13 
  bidentata. 
  

  

  16. 
  Gonodontis 
  nigra 
  $ 
  x 
  bidentata 
  2 
  (from 
  same 
  brood). 
  — 
  Three 
  

   broods 
  kept 
  together. 
  Only 
  57 
  pupse 
  resulted. 
  These 
  produced 
  in 
  

   May, 
  1902, 
  37 
  nigra, 
  and 
  10 
  bidentata. 
  The 
  rest 
  did 
  not 
  emerge. 
  

  

  17. 
  Gonodontis 
  nigra 
  $ 
  x 
  nigra 
  2 
  (from 
  same 
  brood).— 
  Four 
  

   broods 
  kept 
  together. 
  Only 
  120 
  pupated. 
  In 
  December, 
  1901, 
  and 
  

   January, 
  1902, 
  9 
  nigra 
  and 
  2 
  bidentata 
  appeared. 
  In 
  May, 
  1902, 
  81 
  

   nigra, 
  and 
  4 
  bidentata. 
  Total, 
  90 
  nigra 
  and 
  6 
  bidentata. 
  

  

  The 
  results 
  of 
  the 
  last 
  four 
  crossings 
  summarise 
  as 
  follows 
  : 
  — 
  

  

  Ova 
  obtained 
  from. 
  

  

  Broods. 
  

  

  Number 
  

  

  Pupated. 
  

  

  Number 
  

   nigra 
  

   Bred. 
  

  

  Number 
  

   Type 
  

   Bred. 
  

  

  Cripples. 
  

  

  Did 
  not 
  

   emerge. 
  

  

  ab. 
  nigra 
  

  

  Type 
  

  

  Typical 
  J 
  x 
  ? 
  

   type 
  j 
  x 
  nigra 
  ? 
  . 
  . 
  

   nigra 
  a 
  x 
  type 
  ? 
  . 
  . 
  

   nigra 
  j 
  x 
  ? 
  

  

  4 
  

   3 
  

   3 
  

   4 
  

  

  77 
  

  

  60 
  

   57 
  

  

  1 
  20 
  

  

  15 
  

  

  •21 
  

  

  34 
  

  

  70 
  

  

  25 
  

  

  S 
  

   9 
  

   3 
  

  

  3 
  

   14 
  

  

  19 
  

   5 
  

  

  1 
  

   3 
  

  

  22 
  

   10 
  

   24 
  

  

  