﻿132 
  BRITISH 
  LEPLDOPTERA. 
  

  

  longer 
  and 
  more 
  slender 
  one 
  much 
  bent 
  forwards 
  (forming 
  an 
  arrangement 
  like 
  the 
  

   double 
  hooks 
  through 
  which 
  ropes 
  are 
  run 
  out 
  from 
  a 
  ship) 
  ; 
  the 
  others 
  are 
  small 
  

   and 
  very 
  difficult 
  to 
  see, 
  but 
  hi 
  is 
  very 
  close 
  above 
  spiracle 
  ; 
  iv 
  is 
  well 
  behind 
  the 
  

   spiracle 
  and 
  above 
  v, 
  which 
  is 
  only 
  slightly 
  forward 
  of 
  a 
  position 
  immediately 
  

   below 
  spiracle. 
  

  

  4. 
  Agdistis 
  heydenii 
  (from 
  Cannes). 
  — 
  Eemarkable 
  from 
  the 
  fact 
  that 
  the 
  

   tubercles 
  form 
  short 
  pillars 
  and 
  carry 
  comparatively 
  long 
  hairs 
  (0-5mm.) 
  directed 
  

   straight 
  backwards 
  from 
  their 
  bases 
  ; 
  they 
  are 
  slightly 
  curved, 
  and 
  end 
  in 
  a 
  slight 
  

   knob 
  or 
  club.* 
  On 
  the 
  prothorax, 
  the 
  hairs 
  are 
  erect, 
  on 
  four 
  dorsal 
  tubercles 
  

   placed 
  somewhat 
  trapezoidally, 
  below 
  the 
  front 
  one 
  is 
  another 
  (with 
  a 
  baseless 
  hair 
  

   between 
  them), 
  below 
  the 
  spiracle 
  on 
  front 
  margin 
  another, 
  and 
  between 
  the 
  

   spiracle 
  and 
  posterior 
  edge 
  is 
  yet 
  another 
  tubercle 
  ; 
  these 
  are 
  all 
  on 
  tall 
  swollen 
  

   bases. 
  On 
  the 
  mesothorax, 
  the 
  dorsal 
  tubercle 
  on 
  either 
  side 
  is 
  formed 
  by 
  the 
  

   confluence 
  of 
  three, 
  viz., 
  a 
  tall 
  pillar 
  with 
  backward 
  directed 
  hair, 
  and 
  on 
  the 
  front 
  

   of 
  the 
  pillar, 
  and 
  again 
  on 
  the 
  outside, 
  a 
  round 
  protuberance, 
  each 
  carrying 
  hairs 
  ; 
  

   below 
  this 
  is 
  a 
  less 
  prominent 
  boss 
  (iii) 
  with 
  a 
  forward 
  hair 
  ; 
  and 
  below 
  this 
  again 
  

   a 
  pair 
  almost 
  level 
  (with 
  a 
  forward 
  and 
  backward 
  hair) 
  ; 
  again 
  a 
  similar 
  pair, 
  and 
  

   finally 
  one 
  at 
  base 
  of 
  leg. 
  The 
  mesothoracic 
  tubercles 
  are 
  the 
  same, 
  except 
  that 
  

   the 
  outside 
  boss 
  of 
  great 
  tubercle 
  is 
  fairly 
  separate 
  and 
  the 
  anterior 
  one 
  nearly 
  so. 
  

   On 
  the 
  abdominal 
  segments, 
  the 
  dorsal 
  tubercles 
  (i 
  and 
  ii) 
  are 
  well 
  apart, 
  trapezoid- 
  

   ally 
  placed, 
  each 
  is 
  a 
  rounded 
  boss 
  almost 
  a 
  ball, 
  with 
  a 
  long 
  hair 
  nearly 
  parallel 
  

   with 
  surface 
  of 
  larva 
  and 
  directed 
  backwards 
  ; 
  iii 
  is 
  rather 
  behind 
  and 
  not 
  very 
  

   close 
  to 
  spiracle; 
  iv 
  is 
  higher 
  than 
  v 
  and 
  well 
  behind 
  spiracle, 
  v 
  but 
  little 
  in 
  front 
  

   of 
  it. 
  The 
  bent 
  pillars 
  of 
  i 
  and 
  ii 
  get 
  smaller 
  backwards, 
  till, 
  however, 
  on 
  the 
  

   8th 
  abdominal, 
  ii 
  is 
  on 
  each 
  side 
  a 
  great 
  hump 
  ; 
  on 
  the 
  9th 
  abdominal 
  i 
  is 
  absent, 
  

   ii 
  forms 
  a 
  considerable 
  pillar 
  on 
  each 
  side, 
  and 
  iii 
  is 
  well-pronounced 
  ; 
  the 
  10th 
  

   abdominal 
  segment 
  has 
  four 
  smaller 
  bosses 
  along 
  the 
  posterior 
  margin 
  of 
  anal 
  plate 
  

   (two 
  on 
  each 
  side), 
  really 
  the 
  centre 
  of 
  these 
  is 
  on 
  the 
  plate, 
  and 
  there 
  is 
  an 
  ordinary- 
  

   looking 
  hair 
  on 
  margin 
  behind 
  it. 
  

  

  5. 
  Hekbertia 
  tamaricis. 
  — 
  In 
  many 
  respects, 
  this 
  is 
  the 
  most 
  specialised 
  larva 
  of 
  

   those 
  considered, 
  the 
  subspiracular 
  tubercles 
  in 
  particular 
  being 
  of 
  different 
  pattern 
  

   from 
  those 
  already 
  described, 
  viz., 
  iv 
  (?) 
  is 
  high 
  up 
  and 
  directly 
  behind 
  spiracle, 
  v 
  

   below, 
  but 
  a 
  little 
  behind, 
  spiracle. 
  The 
  prothorax 
  carries 
  four 
  trapezoidally-placed, 
  

   humped, 
  low 
  and 
  rounded 
  tubercles; 
  also 
  a 
  central 
  one 
  at 
  posterior 
  margin 
  of 
  

   segment 
  (with 
  twin 
  hair-base 
  but 
  no 
  hair) 
  ; 
  three 
  small 
  tubercular 
  bosses 
  in 
  line 
  

   with 
  the 
  front 
  trapezoidals, 
  one 
  above 
  and 
  two 
  below 
  spiracle 
  ; 
  another 
  small 
  one 
  

   above 
  spiracle 
  (apparently 
  on 
  a 
  segmental 
  element 
  between 
  those 
  of 
  dorsal 
  

   tubercles, 
  but 
  to 
  which 
  spiracle 
  belongs). 
  The 
  mesothorax 
  carries 
  two 
  large 
  tall 
  

   pillars 
  (apparently 
  the 
  twin 
  pillars 
  of 
  E. 
  lerensis, 
  but 
  further 
  conjoined, 
  so 
  that 
  only 
  

   their 
  tops 
  are 
  distinct, 
  and 
  with 
  a 
  third 
  tubercular 
  boss 
  on 
  its 
  outer 
  posterior 
  aspect, 
  

   so 
  that 
  the 
  pillar 
  represents 
  three 
  tubercles) 
  ; 
  below 
  these 
  on 
  either 
  side 
  is 
  another 
  flat 
  

   tubercle, 
  and 
  lower 
  two 
  others 
  at 
  approximately 
  similar 
  levels 
  ; 
  a 
  small 
  one 
  at 
  base 
  

   of 
  leg. 
  The 
  metathorax 
  has 
  a 
  dorsal 
  tubercle 
  with 
  two 
  hairs 
  but 
  no 
  prominent 
  

   boss 
  ; 
  below 
  this 
  is 
  a 
  small 
  one, 
  and 
  two 
  others 
  lower, 
  the 
  posterior 
  a 
  little 
  the 
  

   higher 
  of 
  the 
  two. 
  On 
  the 
  abdominal 
  segments 
  i 
  and 
  ii 
  are 
  distinct, 
  but 
  very 
  close 
  

   together 
  ; 
  iii 
  is 
  close 
  above 
  the 
  spiracle. 
  The 
  2nd 
  and 
  oth 
  abdominals 
  have 
  

   the 
  curious 
  prominences 
  curved 
  over 
  to 
  each 
  other 
  and 
  carrying 
  i 
  and 
  ii. 
  On 
  these 
  

   and 
  the 
  other 
  abdominal 
  segments 
  the 
  minute 
  hairs 
  have 
  the 
  same 
  backward 
  

   direction 
  that 
  gives 
  so 
  marked 
  a 
  peculiarity 
  to 
  A. 
  heydenii. 
  

  

  To 
  complete 
  our 
  summary 
  of 
  these 
  larvss, 
  we 
  quote 
  Hofmann's 
  

   description 
  of 
  that 
  of 
  A. 
  adactyla 
  (Die 
  deutsch. 
  Pteroph., 
  p. 
  29), 
  made 
  

   from 
  a 
  living 
  specimen 
  at 
  Potsdam 
  : 
  — 
  

  

  6. 
  Agdistis 
  adactyla. 
  — 
  12mm. 
  long. 
  On 
  the 
  back 
  of 
  the 
  1st 
  segment 
  (prothorax) 
  

   are 
  four 
  cone-shaped 
  elevations 
  with 
  a 
  strong 
  brown 
  bristle 
  at 
  the 
  apex 
  ; 
  the 
  2nd 
  

   and 
  3rd 
  segments 
  have 
  each 
  two 
  elevations 
  with 
  two 
  bristles 
  each, 
  the 
  hind 
  one 
  of 
  

   which 
  is 
  directed 
  backwards. 
  The 
  elevations 
  on 
  the 
  2nd 
  segment 
  are 
  far 
  taller 
  

   than 
  those 
  of 
  the 
  3rd. 
  On 
  each 
  segment 
  from 
  the 
  4th 
  to 
  the 
  10th 
  stand 
  four 
  bifid 
  

   laterally 
  compressed 
  tall 
  warts 
  (elevations), 
  arranged 
  in 
  a 
  quadrangle, 
  the 
  anterior 
  

   point 
  carries 
  a 
  short 
  bristle 
  directed 
  forwards, 
  and 
  the 
  posterior 
  point 
  a 
  long 
  curved 
  

   bristle 
  directed 
  backwards. 
  On 
  the 
  11th 
  and 
  12th 
  segments 
  the 
  four 
  warts 
  have 
  

  

  * 
  No 
  other 
  larvae 
  have 
  such 
  long 
  hairs 
  except 
  A. 
  satanas, 
  where, 
  however, 
  they 
  

   have 
  quite 
  another 
  character. 
  As 
  in 
  A. 
  frankeniae, 
  the 
  surface 
  is 
  covered 
  with 
  a 
  

   great 
  deal 
  of 
  a 
  similar 
  powdery 
  secretion 
  (Chapman). 
  

  

  