﻿34 
  BRITISH 
  LEPIDOPTERA. 
  

  

  Besides 
  obtaining 
  reciprocal 
  crossings 
  of 
  the 
  two 
  species, 
  as 
  

   detailed 
  above, 
  pairings 
  of 
  the 
  hybrids 
  were 
  obtained 
  by 
  Biding 
  between 
  

   June 
  13th 
  and 
  26th, 
  as 
  follows 
  : 
  — 
  

  

  1. 
  s 
  ( 
  S 
  T. 
  bistortatax 
  2 
  T. 
  ab. 
  delamerensis) 
  x 
  2 
  ( 
  d 
  T. 
  ab. 
  delamerensis 
  x 
  

   2 
  T. 
  bistortata). 
  

  

  2. 
  c? 
  ( 
  cT 
  T. 
  ab. 
  delamerensis 
  x 
  2 
  T. 
  bistortata) 
  x 
  2 
  ( 
  <? 
  T. 
  bistortatax 
  2 
  T. 
  ab. 
  

   delamerensis). 
  

  

  3. 
  <? 
  ( 
  <? 
  T. 
  bistortatax 
  2 
  T. 
  ab. 
  delamerensis) 
  x 
  2 
  ( 
  J 
  T. 
  bistortatax 
  2 
  T. 
  

  

  4. 
  <?.((? 
  T. 
  crepusculariax 
  2 
  T. 
  bistortata) 
  x 
  ? 
  (j 
  T. 
  bistortatax 
  ? 
  T. 
  

   crepuscularia). 
  

  

  5. 
  c? 
  ( 
  J 
  2 
  1 
  . 
  bistortata 
  x 
  2 
  T. 
  crepuscularia) 
  x 
  ? 
  ( 
  <? 
  T. 
  crepusculariax 
  2 
  T. 
  

   bistortata). 
  

  

  Of 
  these 
  different 
  crosses 
  twelve 
  pairings 
  in 
  all 
  were 
  obtained, 
  

   eleven 
  of 
  which 
  gave 
  ova, 
  and 
  yet, 
  of 
  these 
  eleven 
  batches, 
  only 
  two 
  

   were 
  fertile, 
  both 
  crosses 
  of 
  $ 
  {$ 
  T. 
  ab. 
  delamerensis 
  x 
  $ 
  T. 
  bistortata) 
  

   X 
  $ 
  (cT 
  7 
  1 
  - 
  bistortatax 
  ? 
  X'. 
  ab. 
  delamerensis). 
  Later 
  pairings 
  of 
  <J 
  

   (c? 
  T. 
  crepusculariax 
  <j> 
  7 
  7 
  . 
  bistortata) 
  x 
  $ 
  (<? 
  2'. 
  bistortatax 
  ? 
  T. 
  

   crepuscidaria) 
  also 
  proved 
  infertile. 
  Eiding, 
  however, 
  obtained 
  four 
  

   inbred 
  pairings 
  of 
  $ 
  {$ 
  T. 
  bistortatax 
  $ 
  T. 
  crepuscidaria) 
  x 
  $ 
  (<? 
  

   T. 
  bistortata 
  x 
  2 
  T. 
  crepuscidaria) 
  ; 
  one 
  of 
  these 
  produced 
  no 
  eggs, 
  

   another 
  was 
  infertile 
  ; 
  the 
  two 
  others 
  were, 
  however, 
  partially 
  fertile. 
  In 
  

   addition 
  to 
  the 
  first 
  crosses 
  already 
  summarised, 
  Bacot 
  obtained 
  the 
  

   following 
  more 
  or 
  less 
  fertile 
  crossings 
  of 
  the 
  various 
  hybrids 
  reared 
  

   from 
  the 
  already 
  described 
  broods 
  : 
  

  

  1. 
  j 
  ( 
  J 
  T. 
  ab. 
  delamerensis 
  x 
  2 
  T. 
  bistortata) 
  x 
  ? 
  ( 
  <? 
  T. 
  bistortatax 
  2 
  T. 
  

   crepuscidaria). 
  Two 
  pairings 
  — 
  a. 
  June 
  10th 
  ; 
  j3. 
  August 
  6th. 
  

  

  2. 
  3 
  ( 
  J 
  T. 
  ab. 
  delamerensis 
  x 
  2 
  T. 
  bistortata) 
  x 
  2 
  ( 
  <? 
  T. 
  bistortatax 
  2 
  T. 
  ab. 
  

   delamerensis). 
  Two 
  pairings 
  on 
  June 
  10th 
  (eggs 
  mostly 
  fertile). 
  

  

  3. 
  c? 
  ( 
  c? 
  T. 
  bistortatax 
  2 
  T. 
  crepuscidaria) 
  x 
  2 
  ( 
  <? 
  T. 
  bistortata 
  x 
  2 
  T. 
  ab. 
  

   delamerensis). 
  Paired 
  June 
  11th. 
  

  

  He 
  further 
  obtained 
  the 
  following 
  inbred 
  pairings 
  : 
  — 
  

  

  4. 
  J 
  ( 
  t? 
  T. 
  bistortatax 
  2 
  T. 
  crepuscidaria) 
  x 
  2 
  (i 
  T. 
  bistortatax 
  2 
  T 
  

   crepuscidaria). 
  Four 
  pairings 
  : 
  — 
  a. 
  June 
  10th. 
  /3. 
  June 
  10th. 
  y. 
  June 
  14th. 
  5. 
  

   June 
  17th. 
  (A. 
  large 
  percentage 
  of 
  the 
  eggs 
  infertile.) 
  

  

  5. 
  c? 
  ( 
  S 
  T. 
  bistortatax 
  2 
  Z 
  1 
  . 
  ab. 
  delamerensis) 
  x 
  2 
  ( 
  J 
  T. 
  bistortatax 
  2 
  T. 
  

   ab. 
  delamerensis). 
  One 
  pairing 
  June 
  13th. 
  • 
  

  

  The 
  following 
  pairings 
  of 
  a 
  hybrid 
  with 
  one 
  of 
  the 
  parent 
  species 
  

   were 
  also 
  obtained 
  : 
  

  

  6. 
  3 
  ( 
  c? 
  T. 
  ab. 
  delamerensis 
  x 
  2 
  T. 
  bistortata) 
  x 
  2 
  T. 
  bistortata 
  (second 
  

   brood). 
  Paired 
  June 
  15th. 
  Only 
  one 
  or 
  two 
  ova 
  hatched, 
  remainder 
  infertile. 
  

  

  7. 
  £ 
  T. 
  crepuscularia 
  (second 
  broodj 
  x 
  ? 
  (,? 
  L 
  bistortata 
  x 
  ? 
  T. 
  ab. 
  

   delamerensis). 
  Paired 
  July 
  4th. 
  

  

  The 
  following 
  crosses 
  entirely 
  failed 
  : 
  — 
  

  

  1. 
  j 
  ( 
  <S 
  T. 
  bistortata 
  x 
  2 
  T. 
  ab. 
  delamerensis) 
  x 
  ? 
  (3 
  T. 
  bistortata 
  x 
  2 
  

   T. 
  ab. 
  delamerensis). 
  Paired 
  June 
  12th. 
  

  

  2. 
  <? 
  ( 
  c? 
  T. 
  bistortatax 
  2 
  T. 
  ab. 
  delamerensis) 
  x 
  2 
  ( 
  t? 
  T. 
  bistortatax 
  $ 
  

   T. 
  crepuscularia). 
  Paired 
  June 
  14th. 
  

  

  3. 
  c? 
  ( 
  t? 
  T. 
  ab. 
  delamerensis 
  x 
  2 
  T. 
  bistortata) 
  x 
  2 
  ( 
  c? 
  T. 
  bistortata 
  x 
  2 
  T. 
  

   crepuscularia). 
  

  

  Only 
  one 
  secondary 
  hybrid 
  was 
  reared 
  to 
  the 
  imaginal 
  stage, 
  

  

  ■m. 
  : 
  — 
  

  

  v. 
  Hybrid 
  between 
  $ 
  T. 
  bacoti-sufusa 
  x 
  2 
  T. 
  ridingi-sufusa. 
  — 
  A 
  c? 
  ( 
  <? 
  

   T. 
  ab. 
  delamerensis 
  x 
  2 
  bistortata) 
  paired 
  with 
  a 
  2 
  ( 
  J 
  27. 
  bistortata 
  

   x 
  2 
  T. 
  ab. 
  delamerensis), 
  the 
  parents 
  being 
  taken 
  from 
  Dr. 
  Eiding's 
  crossings 
  ii 
  and 
  i 
  

   above 
  respectively. 
  Two 
  batches 
  of 
  eggs, 
  hatched 
  June 
  27th-30th 
  ; 
  forty-six 
  imagines 
  

   emerged 
  between 
  August 
  21st 
  and 
  November 
  19th, 
  1897 
  (see 
  Ent. 
  Bee, 
  x., 
  pp. 
  

   143-145). 
  It 
  is 
  almost 
  impossible 
  to 
  classify 
  these 
  = 
  T. 
  hybr. 
  mixta, 
  n. 
  hybr. 
  T. 
  

   hybr. 
  mixta 
  was 
  inbred 
  by 
  Eiding. 
  The 
  pairing 
  is 
  noted 
  as 
  occurring 
  on 
  August 
  31st, 
  

  

  