﻿538 
  BRITISH 
  LEPIDOPTERA. 
  

  

  red 
  coloration 
  is 
  absent, 
  the 
  red 
  being 
  represented 
  by 
  pale 
  grey 
  ; 
  th& 
  

   markings 
  are 
  pale 
  olive-green 
  as 
  in 
  the 
  type, 
  but 
  confused 
  on 
  the 
  left 
  

   forewing 
  ; 
  hind 
  wings 
  crippled. 
  All 
  the 
  moths 
  bred 
  are 
  $ 
  s. 
  Larva 
  

   (pi. 
  ix., 
  fig. 
  1). 
  — 
  Head 
  brown 
  ; 
  a 
  reddish 
  dorsal 
  stripe 
  from 
  head 
  to 
  

   caudal 
  horn; 
  on 
  both 
  sides 
  of 
  this 
  a 
  velvety-black 
  stripe, 
  and 
  a 
  similar 
  

   one 
  above 
  the 
  legs. 
  The 
  space 
  between 
  these 
  stripes 
  is 
  sprinkled 
  with 
  

   innumerable 
  fine 
  yellow 
  and 
  reddish 
  dots, 
  and 
  similar, 
  but 
  much 
  finer, 
  

   dots 
  occur 
  in 
  the 
  black 
  bands. 
  These 
  dots 
  are 
  so 
  arranged 
  that 
  five 
  

   narrow 
  black 
  bands 
  are 
  formed 
  on 
  each 
  segment, 
  which 
  run 
  also 
  

   across 
  the 
  reddish 
  dorsal 
  stripe. 
  On 
  each 
  segment, 
  at 
  the 
  lower 
  

   margin 
  of 
  the 
  black, 
  longitudinal, 
  dorsal 
  stripes, 
  is 
  a 
  pale 
  yellow 
  spot. 
  

   Those 
  on 
  the 
  first 
  four 
  segments 
  are 
  larger 
  than 
  the 
  rest. 
  Spiracles 
  

   white, 
  oval 
  ; 
  immediately 
  below 
  each 
  is 
  a 
  suffused 
  red 
  spot. 
  On 
  the 
  

   8th 
  abdominal 
  segment 
  there 
  is 
  the 
  slightly-curved 
  black 
  horn, 
  with 
  

   only 
  the 
  extreme 
  tip 
  white. 
  At 
  the 
  base 
  of 
  the 
  horn, 
  on 
  both 
  sides, 
  

   is 
  a 
  large 
  yellow 
  spot, 
  extending 
  into 
  the 
  base. 
  The 
  length 
  of 
  the 
  

   horn 
  is 
  intermediate 
  between 
  that 
  of 
  elpenor 
  and 
  euphorbiae. 
  Legs 
  

   blackish, 
  red-brown 
  in 
  the 
  middle, 
  sprinkled 
  with 
  very 
  many 
  flesh- 
  

   coloured 
  dots. 
  The 
  larva 
  beneath 
  is 
  flesh-coloured, 
  and 
  sprinkled, 
  

   except 
  in 
  the 
  incisions, 
  likewise 
  with 
  fine 
  dots. 
  The 
  larva 
  appears 
  

   shagreened, 
  by 
  reason 
  of 
  the 
  innumerable 
  dots. 
  It 
  approaches 
  nearer 
  

   to 
  that 
  of 
  euphorbiae 
  than 
  to 
  that 
  of 
  elpenor. 
  The 
  enlargement 
  of 
  the 
  

   metathorax 
  and 
  1st 
  abdominal 
  segment, 
  noticeable 
  in 
  elpenor, 
  is 
  not 
  

   to 
  be 
  observed. 
  Pupa 
  (pi. 
  ix., 
  fig. 
  2). 
  — 
  Brownish-grey, 
  darker 
  on 
  the 
  

   most 
  prominent 
  parts 
  of 
  the 
  segments, 
  the 
  wing-cases, 
  and 
  on 
  the 
  

   dorsum. 
  The 
  cephalic 
  parts 
  are 
  less 
  pronounced 
  than 
  in 
  elpenor, 
  

   though 
  more 
  sharply 
  modelled 
  than 
  in 
  eupliorbiae. 
  The 
  cremaster 
  

   terminates 
  in 
  a 
  point 
  broad 
  at 
  the 
  base, 
  and 
  turned 
  sharply 
  down- 
  

   wards. 
  The 
  spines 
  on 
  the 
  abdominal 
  segments 
  of 
  elpenor 
  are 
  only 
  

   weakly 
  expressed 
  in 
  the 
  hybrid 
  pupa 
  (Jacobs). 
  

  

  3a. 
  [To 
  p. 
  24.] 
  Thaumas 
  hybr. 
  densoi 
  (vespertilio 
  $ 
  x 
  euphorbiae 
  2 
  ), 
  

   Muschamp, 
  Ent. 
  Rec, 
  xviii., 
  pp. 
  237-8 
  (1906). 
  — 
  Two 
  $ 
  and 
  two 
  ? 
  

   moths 
  emerged 
  after 
  three 
  weeks 
  of 
  pupal 
  life. 
  The 
  females 
  are 
  full 
  

   of 
  eggs. 
  The 
  ground 
  colour 
  of 
  the 
  forewing 
  is 
  of 
  the 
  vespertilio-grej, 
  

   with, 
  in 
  two 
  cases, 
  a 
  yellowish-pink 
  shading 
  combining 
  with 
  the 
  grey; 
  

   the 
  bands 
  exist 
  as 
  in 
  euphorbiae, 
  but 
  are 
  greatly 
  diminished 
  in 
  breadth 
  

   and 
  in 
  length. 
  The 
  hind 
  wing 
  is 
  the 
  hindwing 
  of 
  vespertilio, 
  but 
  with 
  

   a 
  broader 
  pink 
  outer 
  margin. 
  The 
  underside 
  is 
  much 
  pinker 
  than 
  in 
  

   vespertilio, 
  which 
  it 
  resembles 
  with 
  regard 
  to 
  the 
  grey 
  marginal 
  bands 
  

   of 
  the 
  hindwing. 
  The 
  abdomen 
  and 
  thorax 
  strongly 
  resemble 
  those 
  

   of 
  euphorbiae. 
  However, 
  in 
  two 
  insects, 
  the 
  3rd 
  abdominal 
  black 
  

   band 
  is 
  visible 
  as 
  in 
  vespertilio. 
  Larva. 
  — 
  First 
  stage 
  : 
  Ground 
  

   colour 
  light 
  yellowish-green, 
  head 
  rather 
  darker, 
  with 
  a 
  little 
  inter- 
  

   mixture 
  of 
  olive. 
  Caudal 
  horn 
  from 
  0-2nim. 
  to 
  0-3mm. 
  long. 
  Anal 
  

   segments, 
  and 
  prolegs, 
  darkish 
  green. 
  The 
  larva 
  of 
  vespertilio, 
  in 
  this 
  

   stage, 
  has 
  the 
  ground 
  colour 
  light 
  yellow, 
  the 
  head 
  of 
  the 
  same 
  colour, 
  

   anal 
  segment 
  rather 
  darker. 
  The 
  setae 
  are 
  exactly 
  the 
  same 
  .in 
  the 
  

   three 
  different 
  larvae. 
  No 
  caudal 
  horn. 
  The 
  larva 
  of 
  euphorbiae 
  has 
  the 
  

   ground 
  colour 
  light 
  olive-green, 
  the 
  head 
  and 
  base 
  of 
  prolegs 
  being 
  of 
  

   a 
  very 
  dark 
  olive-brown 
  colour. 
  Caudal 
  horn 
  from 
  0'5mm. 
  to 
  06mm. 
  

   in 
  length. 
  Second 
  stage 
  : 
  The 
  larva 
  of 
  densoi 
  differs 
  from 
  that 
  of 
  euphor- 
  

   biae 
  in 
  that 
  the 
  yellow-grey 
  subdorsal 
  line 
  is 
  very 
  much 
  more 
  clearly 
  

   indicated, 
  and 
  the 
  white 
  spots 
  are 
  prominent. 
  The 
  ground 
  colour 
  is. 
  

  

  