﻿AGDISTIDES. 
  133 
  

  

  gathered 
  close 
  together 
  and 
  are 
  no 
  longer 
  bifid, 
  but 
  cone-shaped 
  ; 
  the 
  posterior 
  pair 
  

   is 
  much 
  taller 
  and 
  stronger 
  than 
  the 
  anterior. 
  The 
  anal 
  flap 
  (13th 
  segment) 
  

   bears 
  four 
  simple, 
  strong, 
  brown 
  bristles. 
  The 
  flange 
  is 
  very 
  strongly 
  expressed, 
  

   and 
  bears 
  on 
  each 
  segment 
  an 
  elongate 
  bipartite 
  larger 
  wart, 
  one 
  of 
  its 
  two 
  bristles 
  

   is 
  directed 
  forwards 
  and 
  the 
  other 
  backwards. 
  The 
  remaining 
  lateral 
  warts 
  are 
  

   very 
  small 
  and 
  bear 
  one 
  bristle 
  ; 
  on 
  the 
  belly 
  no 
  distinct 
  warts 
  are 
  observable. 
  

   Ground 
  colour 
  grey-brown 
  ; 
  the 
  markings 
  consist 
  of 
  an 
  indistinct, 
  thin, 
  black, 
  

   sometimes 
  obsolete, 
  dorsal 
  line, 
  a 
  spiracularline 
  composed 
  of 
  detached 
  oblique 
  black 
  

   streaks, 
  and 
  a 
  black 
  undulating 
  basal 
  line. 
  The 
  flange 
  is 
  lighter 
  than 
  the 
  ground 
  

   colour, 
  almost 
  whitish. 
  Spiracles 
  small, 
  ringed 
  with 
  black, 
  very 
  difficult 
  to 
  see. 
  

   Head 
  small, 
  retractile, 
  rough 
  and 
  bristly, 
  grey-brown. 
  Above 
  each 
  pair 
  of 
  the 
  

   thoracic 
  feet, 
  but 
  below 
  the 
  flange, 
  lies 
  an 
  elongate 
  roll 
  set 
  with 
  brown 
  scales 
  and 
  

   white 
  clubbed 
  hairs 
  ; 
  underneath 
  each 
  are 
  two 
  small 
  warts 
  set 
  obliquely. 
  The 
  

   thoracic 
  feet 
  are 
  grey-brown, 
  the 
  last 
  joint 
  is 
  whitish 
  with 
  a 
  black 
  apex. 
  Ventral 
  

   and 
  anal 
  claspers 
  like 
  the 
  belly 
  itself, 
  somewhat 
  lighter 
  coloured 
  than 
  the 
  upper- 
  

   side. 
  The 
  ventral 
  claspers 
  exhibit 
  on 
  the 
  inner 
  sole 
  a 
  double 
  row 
  of 
  hooklets, 
  of 
  

   which 
  the 
  outer 
  are 
  very 
  long 
  whilst 
  the 
  inner 
  are 
  very 
  short. 
  The 
  larva 
  is 
  very 
  

   inactive 
  and 
  slow, 
  and 
  when 
  touched 
  assumes 
  a 
  peculiar 
  condition 
  of 
  rigidity, 
  when 
  

   the 
  2nd 
  and 
  3rd 
  segments 
  are 
  elevated 
  in 
  a 
  characteristic 
  manner 
  (Stange, 
  Stett. 
  

   Ent. 
  Zeit., 
  1889, 
  p. 
  318). 
  It 
  lives 
  at 
  the 
  beginning 
  of 
  June 
  on 
  Artemisia 
  cam- 
  

   pestris, 
  much 
  concealed. 
  

  

  The 
  following 
  species 
  has 
  remarkable 
  developments 
  of 
  the 
  setae, 
  the 
  

   hairs 
  reminding 
  one 
  much 
  of 
  those 
  of 
  Agdistis 
  heydenii, 
  but 
  almost 
  more 
  

   of 
  such 
  Alucitid 
  larvae 
  as 
  that 
  of 
  Porrittia 
  r/alactodactyla, 
  the 
  long 
  hairs 
  

   beiug 
  directed 
  backwards 
  with 
  a 
  sweeping 
  curve, 
  and 
  supplemented 
  by 
  

   what 
  appear 
  to 
  be 
  secondary 
  hairs, 
  all 
  of 
  which 
  are 
  of 
  the 
  usual 
  bristle- 
  

   like 
  pattern 
  and 
  not 
  of 
  the 
  clubbed 
  form 
  as 
  in 
  other 
  Agdistids. 
  This 
  

   does 
  not, 
  however, 
  refer 
  to 
  the 
  secondary 
  hairs 
  proper, 
  with 
  which 
  the 
  

   skin 
  generally 
  and 
  the 
  tubercular 
  pillars 
  are 
  crowded, 
  and 
  which 
  also 
  

   carry 
  a 
  certain 
  quantity 
  of 
  secretion 
  ; 
  these 
  hairs 
  are 
  colourless 
  and, 
  

   though 
  tapering, 
  blunt-ended. 
  It 
  seems 
  somewhat 
  hopeless 
  to 
  describe 
  

   the 
  larva 
  in 
  detail 
  :• 
  — 
  - 
  

  

  7. 
  Agdistis 
  satanas.* 
  — 
  The 
  chief 
  tubercular 
  pillars 
  are 
  tall, 
  carry 
  a 
  long 
  hair, 
  

   0*8mm. 
  to 
  0'9mm., 
  b]ack, 
  curved 
  and 
  pointed 
  ; 
  the 
  surface 
  of 
  the 
  pillar 
  is 
  covered 
  

   with 
  a 
  wealth 
  of 
  secondary 
  hairs, 
  usually 
  longer 
  than 
  those 
  of 
  the 
  body-surface, 
  

   and 
  some 
  of 
  them 
  almost 
  true 
  hairs 
  like 
  the 
  tubercular 
  ones 
  (this 
  applies 
  chiefly 
  to 
  

   the 
  dorsal 
  tubercles). 
  On 
  the 
  prothorax 
  are 
  two 
  great 
  cones 
  (one 
  on 
  each 
  side) 
  in 
  

   front, 
  and 
  behind 
  each 
  of 
  these, 
  and 
  a 
  little 
  further 
  out, 
  a 
  rather 
  larger 
  one 
  ; 
  along 
  

   the 
  margin 
  below 
  the 
  first 
  are 
  three 
  smaller 
  ones, 
  and 
  another 
  one 
  at 
  base 
  of 
  leg 
  ; 
  

   there 
  is 
  also 
  a 
  small 
  one 
  above 
  spiracle. 
  On 
  the 
  mesothorax, 
  the 
  dorsal 
  tubercle, 
  

   i, 
  is 
  very 
  large 
  and 
  carries 
  two 
  hairs, 
  one 
  in 
  front 
  and 
  one 
  behind 
  ; 
  outside 
  this 
  is 
  

   a 
  smaller 
  cone 
  (ii) 
  with 
  hair, 
  then 
  a 
  single 
  one 
  again, 
  then 
  a 
  pair 
  level, 
  again 
  a 
  

   pair, 
  and 
  one 
  at 
  base 
  of 
  leg 
  (the 
  latter 
  almost 
  a 
  pair 
  by 
  reason 
  of 
  a 
  very 
  strong 
  

   secondary 
  hair 
  some 
  way 
  behind 
  it). 
  The 
  metathorax 
  is 
  almost 
  exactly 
  the 
  same. 
  

   On 
  the 
  1st 
  abdominal 
  segment, 
  i 
  and 
  ii 
  have 
  not 
  such 
  large 
  bases, 
  but 
  i 
  has 
  the 
  

   true 
  tubercular 
  bristles 
  upright 
  and 
  then 
  sweeping 
  backwards, 
  and 
  a 
  strong 
  hair 
  

   directed 
  forwards 
  like 
  a 
  brow-antler; 
  ii 
  is 
  much 
  the 
  same, 
  but 
  the 
  brow-antler 
  is 
  

   stronger, 
  and 
  there 
  is 
  a 
  similar 
  hair 
  behind 
  supplemented 
  by 
  a 
  slighter 
  one 
  ; 
  iii 
  is 
  

   quite 
  simple, 
  a 
  good 
  way 
  above 
  spiracle 
  ; 
  iv 
  is 
  some 
  way 
  behind 
  spiracle 
  and 
  about 
  

   on 
  a 
  level 
  with 
  it, 
  and 
  has 
  a 
  very 
  strong 
  hair 
  and 
  a 
  good 
  brow-antler 
  pointing 
  

   forwards; 
  v 
  is 
  directly 
  below 
  spiracle, 
  its 
  primary 
  hair 
  is 
  not 
  so 
  strong 
  and 
  there 
  is 
  

   nearly 
  as 
  strong 
  a 
  secondary 
  hair 
  behind 
  it; 
  below 
  iv 
  is 
  a 
  strong 
  oone 
  with 
  strong 
  

   hair, 
  below 
  this 
  again 
  is 
  a 
  tubercle 
  and 
  hair 
  in 
  middle 
  of 
  segment, 
  and 
  there 
  is 
  no 
  other 
  

   till 
  those 
  on 
  the 
  proleg 
  are 
  reached. 
  The 
  remaining 
  abdominal 
  segments 
  are 
  the 
  

   same, 
  the 
  cones 
  and 
  hairs 
  diminish 
  a 
  little 
  backwards, 
  but 
  are 
  still 
  well-developed 
  

  

  * 
  This 
  larva 
  was 
  swept 
  by 
  Milliere, 
  and 
  what 
  it 
  is. 
  is 
  merely 
  a 
  matter 
  of 
  con- 
  

   jecture. 
  That 
  such 
  masters 
  in 
  knowledge 
  of 
  these 
  larvse 
  as 
  Lord 
  Walsingham 
  and 
  

   Milliere 
  suggest 
  it 
  may 
  be 
  satanas 
  Carries 
  nnich 
  weight. 
  It 
  appears 
  to 
  me 
  to 
  be 
  

   certainly 
  a 
  plume 
  larva, 
  and 
  with 
  great 
  probability 
  an 
  Agdistid, 
  but 
  it 
  differs 
  so 
  

   much 
  from 
  all 
  the 
  others 
  as 
  to 
  give 
  room 
  for 
  some 
  doubt. 
  Whatever 
  it 
  is. 
  r, 
  is 
  a 
  

   most 
  remarkable 
  form 
  (Chapman). 
  

  

  