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  BRITISH 
  LEPIDOPTERA. 
  

  

  others, 
  e.g., 
  the 
  Alueitines 
  (as 
  represented 
  by 
  Alucita 
  pentadactyla) 
  have 
  a 
  

   highly 
  specialised 
  wing-form 
  compared 
  with 
  any 
  Platyptiliine, 
  whilst 
  

   there 
  can 
  be 
  no 
  doubt 
  whatever 
  that 
  the 
  " 
  double 
  spina" 
  of 
  the 
  frenulum 
  

   of 
  the 
  former 
  is 
  more 
  generalised 
  than 
  the 
  " 
  single 
  spina 
  " 
  of 
  the 
  

   frenulum 
  of 
  the 
  latter. 
  

  

  Our 
  tribe 
  Platyptiliidi, 
  as 
  the 
  genus 
  Platyptilus, 
  is 
  thus 
  diagnosed 
  

   by 
  Wallengren 
  (Kong. 
  Svensk. 
  Vaten. 
  Akacl. 
  HandL, 
  iii., 
  p. 
  11) 
  at 
  

   length 
  : 
  

  

  ""* 
  Antennas 
  of 
  both 
  sexes 
  with 
  very 
  short 
  cilia. 
  Forehead 
  adorned 
  with 
  a 
  more 
  

   or 
  less 
  elongated 
  tuft. 
  Palpi 
  longer 
  than 
  the 
  head, 
  rather 
  rounded, 
  slightly 
  

   ascending, 
  with 
  the 
  last 
  joint 
  more 
  or 
  less 
  elongated, 
  sometimes 
  a 
  little 
  drooping. 
  

   Legs 
  longer, 
  slender, 
  the 
  tibiae 
  sometimes 
  thickened 
  towards 
  the 
  apex. 
  First 
  pair 
  

   of 
  spines 
  on 
  the 
  posterior 
  tibiae 
  slightly 
  unequal, 
  second 
  pair 
  almost 
  equal, 
  shorter 
  

   than 
  the 
  shortest 
  spine 
  of 
  the 
  first 
  pair. 
  Anterior 
  wings 
  not 
  divided 
  to 
  the 
  third 
  

   part 
  of 
  their 
  length, 
  the 
  segments 
  broad, 
  the 
  posterior 
  segment 
  almost 
  hatchet- 
  

   shaped, 
  the 
  posterior 
  angle 
  of 
  both 
  segments 
  well-marked. 
  The 
  segments 
  of 
  the 
  

   inferior 
  wings 
  more 
  slender, 
  the 
  third 
  division 
  with 
  the 
  anal 
  angle 
  sufficiently 
  

   marked 
  but 
  nearer 
  to 
  the 
  base. 
  The 
  anterior 
  wings 
  flat, 
  covering 
  the 
  inferior 
  when 
  

   at 
  rest. 
  The 
  veins 
  of 
  the 
  anterior 
  wings 
  ten 
  in 
  number 
  ; 
  first 
  and 
  second 
  separate, 
  

   coming 
  from 
  the 
  base, 
  the 
  third 
  from 
  the 
  posterior 
  margin 
  of 
  the 
  cell, 
  all 
  running 
  

   into 
  the 
  posterior 
  segment, 
  the 
  sixth 
  coming 
  out 
  near 
  the 
  anterior 
  angle 
  of 
  the 
  cell, 
  and 
  

   running 
  into 
  the 
  posterior 
  angle 
  of 
  the 
  anterior 
  segment, 
  the 
  seventh 
  two-branched, 
  

   coming 
  out 
  from 
  the 
  anterior 
  angle 
  of 
  the 
  cell, 
  and 
  running 
  into 
  the 
  apex 
  of 
  the 
  

   anterior 
  segment, 
  the 
  eighth 
  and 
  ninth 
  coming 
  out 
  from 
  the 
  anterior 
  side 
  of 
  the 
  

   cell 
  and 
  running 
  into 
  the 
  anterior 
  margin 
  of 
  the 
  wing, 
  the 
  tenth 
  coming 
  from 
  the 
  

   base 
  and 
  ending 
  almost 
  in 
  the 
  middle 
  of 
  the 
  anterior 
  margin. 
  The 
  cell 
  well 
  

   marked, 
  with 
  a 
  very 
  slender 
  little 
  transverse 
  vein, 
  almost 
  straight, 
  closed. 
  Veins 
  

   of 
  the 
  posterior 
  wings 
  three 
  in 
  number, 
  the 
  first 
  coming 
  from 
  the 
  base, 
  two- 
  

   branched, 
  running 
  into 
  the 
  anterior 
  segment, 
  the 
  second 
  three-branched, 
  running 
  

   into 
  the 
  second 
  division, 
  and 
  the 
  third 
  simple, 
  running 
  into 
  the 
  third 
  division. 
  No 
  

   cell. 
  

  

  Hofmann 
  gives 
  (Die 
  Deutsch, 
  Pteroph., 
  pp. 
  36 
  et 
  seq.) 
  a 
  further 
  

   excellent 
  diagnosis 
  of 
  the 
  group. 
  He 
  notes 
  the 
  neuration 
  as 
  being 
  not 
  

   different 
  from 
  that 
  of 
  Eucnemidophorus, 
  and 
  adds 
  the 
  following 
  account 
  

   of 
  the 
  general 
  character 
  of 
  the 
  markings 
  to 
  be 
  found 
  in 
  the 
  group 
  : 
  " 
  The 
  

   costa 
  and 
  inner 
  margin 
  of 
  the 
  f 
  orewing 
  are 
  rather 
  darker 
  than 
  the 
  central 
  

   area 
  ; 
  the 
  former 
  is 
  usually 
  sprinkled 
  with 
  fine 
  white 
  dots 
  ; 
  behind 
  the 
  spots 
  

   or 
  the 
  streak 
  at 
  the 
  fissure, 
  a 
  paler 
  area 
  may 
  usually 
  be 
  seen 
  which 
  ex- 
  

   tends 
  faintly 
  over 
  the 
  upper 
  segment 
  or 
  lobe, 
  but 
  sometimes 
  also 
  passes 
  on 
  

   to 
  the 
  lower 
  segment, 
  thus 
  forming 
  a 
  pale, 
  though 
  indistinct, 
  transverse 
  

   band 
  just 
  before 
  the 
  fissure 
  ; 
  a 
  fine 
  bright 
  transverse 
  line 
  often 
  runs 
  

   across 
  both 
  the 
  segments 
  ; 
  on 
  the 
  underside, 
  the 
  lighter 
  area 
  behind 
  

   the 
  costal 
  triangle 
  and 
  the 
  transverse 
  line 
  across 
  the 
  two 
  segments 
  are 
  

   noticeable. 
  The 
  1st 
  segment 
  of 
  the 
  hindwings 
  often 
  has 
  a 
  bright 
  

   spot 
  or 
  transverse 
  line, 
  straight 
  or 
  diagonal, 
  before 
  the 
  apex 
  ; 
  the 
  1st 
  

   and 
  3rd 
  segments 
  are 
  often 
  dusted 
  with 
  white, 
  the 
  2nd 
  segment, 
  on 
  the 
  

   other 
  hand, 
  is 
  always 
  unicolorous. 
  The 
  fringes 
  of 
  the 
  segments 
  of 
  the 
  

   forewings 
  have 
  a 
  dark, 
  more 
  or 
  less 
  thick, 
  basal 
  line, 
  which 
  penetrates 
  

   sometimes 
  more 
  and 
  sometimes 
  less 
  deeply 
  into 
  the 
  mouth 
  of 
  the 
  

   fissure, 
  and 
  also 
  runs 
  round 
  the 
  anal 
  angle 
  of 
  the 
  lower 
  segment. 
  On 
  

   the 
  inner 
  margin 
  of 
  the 
  forewings, 
  below 
  the 
  fissure 
  and 
  beyond 
  the 
  

   centre, 
  there 
  is 
  a 
  small 
  black 
  tuft 
  of 
  scales 
  in 
  the 
  fringe. 
  At 
  the 
  place 
  

   where 
  the 
  anal 
  angle 
  of 
  the 
  3rd 
  segment 
  of 
  the 
  hindwing 
  would 
  be, 
  

   there 
  is 
  a 
  tooth-shaped, 
  or 
  stripe-like, 
  collection 
  of 
  black 
  scales 
  in 
  the 
  

   hind-marginal 
  fringe. 
  The 
  posterior 
  part 
  of 
  the 
  thorax 
  and 
  the 
  1st 
  

   segment 
  of 
  the 
  abdomen 
  are 
  mostly 
  whitish, 
  or 
  whitish-yellow 
  in 
  

   colour. 
  The 
  front 
  and 
  middle 
  tibiae 
  somewhat 
  thickened 
  at 
  the 
  ends 
  

  

  