﻿496 
  BKITISH 
  LEPIDOPTERA. 
  

  

  lower 
  level. 
  These 
  remarkable 
  tufts 
  of 
  hair-scales 
  are 
  absent 
  from 
  the 
  

   abdomen 
  of 
  the 
  female." 
  

  

  Variation. 
  — 
  The 
  imagines 
  are 
  variable 
  in 
  size, 
  the 
  larger 
  specimens 
  

   looking 
  also 
  much 
  wider-, 
  as 
  well 
  as 
  longer- 
  winged.. 
  The 
  ground 
  

   colour 
  varies 
  somewhat, 
  an 
  occasional 
  example 
  being 
  quite 
  bright 
  brown 
  

   (tinged 
  with 
  reddish) 
  rather 
  than 
  dull 
  fuscous-brown 
  ; 
  the 
  quantity 
  

   of 
  white 
  scaling 
  on 
  the 
  costa, 
  and 
  in 
  the 
  discal 
  area 
  also, 
  varies 
  

   considerably, 
  some 
  specimens 
  occasionally 
  having 
  quite 
  a 
  white 
  discal 
  

   area 
  ; 
  in 
  one 
  example 
  under 
  observation, 
  the 
  white 
  is 
  very 
  much 
  more 
  

   developed 
  on 
  the 
  left, 
  than 
  on 
  the 
  right, 
  forewing. 
  The 
  continuation 
  

   of 
  the 
  inner 
  lobal 
  line 
  over 
  the 
  lower 
  lobe 
  is 
  also 
  at 
  times 
  somewhat 
  

   ill-developed, 
  but 
  the 
  actual 
  amount 
  of 
  variation 
  does 
  not 
  appear 
  to 
  

   be 
  very 
  great 
  or 
  very 
  marked. 
  Bankes 
  observes 
  (in 
  litt.) 
  that 
  the 
  

   moths 
  vary 
  but 
  moderately 
  in 
  colour, 
  but 
  the 
  sexes 
  show 
  con- 
  

   siderable 
  difference 
  in 
  size, 
  good-sized 
  $ 
  s 
  expanding 
  15mm., 
  whereas 
  

   good-sized 
  2 
  s 
  only 
  expand 
  13mm. 
  Barrett 
  observes 
  that 
  Yorkshire 
  

   specimens 
  are 
  much 
  larger 
  than 
  those 
  taken 
  elsewhere, 
  but, 
  as 
  only 
  two 
  

   Yorkshire 
  examples 
  are 
  known, 
  the 
  data 
  hardly 
  warrant 
  such 
  a 
  

   sweeping 
  generalisation. 
  Hofmann 
  writes 
  (Die 
  Deutsch. 
  Pteroph., 
  p. 
  

   170) 
  : 
  " 
  The 
  distribution 
  of 
  the 
  markings 
  is 
  quite 
  similar 
  to 
  that 
  of 
  

   the 
  species 
  of 
  Oxyptiliis. 
  The 
  ground 
  colour 
  grey-brown 
  at 
  the 
  base, 
  

   with 
  white 
  scaling 
  forming 
  an 
  indistinct 
  longitudinal 
  stripe 
  ; 
  on 
  the 
  

   costa, 
  likewise, 
  a 
  few 
  white 
  scales. 
  Inner-marginal 
  spot 
  and 
  discoidal 
  

   spot 
  white 
  (sometimes 
  indistinct). 
  The 
  inner-marginal 
  spot 
  is 
  bordered, 
  

   towards 
  the 
  base, 
  by 
  a 
  more 
  or 
  less 
  strongly 
  expressed 
  short 
  black 
  

   streak. 
  Immediately 
  before 
  the 
  fissure 
  there 
  is, 
  in 
  the 
  (height)" 
  neigh- 
  

   bourhood 
  of 
  the 
  costa 
  of 
  the 
  lower 
  lobe, 
  a 
  black 
  spot, 
  and 
  a 
  white 
  spot 
  

   above 
  it 
  (fissural 
  spots). 
  Across 
  the 
  lobes 
  run 
  two, 
  often 
  indistinct, 
  

   white 
  transverse 
  lines, 
  which 
  are 
  continued 
  into 
  the 
  dark 
  brown 
  costal 
  

   fringes. 
  At 
  the 
  extreme 
  apex 
  these 
  (the 
  fringes) 
  are 
  white, 
  and 
  cut 
  

   below 
  by 
  a 
  narrow, 
  deep 
  black, 
  longitudinal 
  dash. 
  On 
  the 
  inner 
  

   margin 
  of 
  the 
  upper 
  lobe 
  the 
  fringes 
  are 
  brownish, 
  with 
  a 
  strong 
  black 
  

   dash 
  bordered 
  on 
  each 
  side 
  by 
  white 
  just 
  before 
  the 
  apex, 
  which 
  cuts 
  

   through 
  the 
  whole 
  length 
  of 
  the 
  fringes 
  (in 
  contrast 
  with 
  Oxyptiliis, 
  

   where 
  the 
  dash, 
  at 
  the 
  situation 
  named, 
  cuts 
  only 
  through 
  the 
  basal 
  

   line 
  of 
  the 
  fringe, 
  and 
  is 
  often 
  very 
  small 
  or 
  altogether 
  absent). 
  Under 
  

   the 
  white 
  transverse 
  line 
  are 
  a 
  few 
  white 
  scales, 
  and 
  also 
  on 
  the 
  inner 
  

   margin 
  of 
  the 
  upper 
  lobe, 
  and 
  besides, 
  between 
  these 
  situations, 
  there 
  are 
  

   some 
  broad 
  black 
  scales. 
  The 
  fringes 
  of 
  the 
  lower 
  lobe 
  are 
  brown, 
  at 
  

   the 
  extreme 
  apex 
  white, 
  with 
  several 
  single 
  black 
  scales, 
  at 
  the 
  base, 
  on 
  

   the 
  costa, 
  as 
  well 
  as 
  on 
  the 
  inner 
  margin, 
  and 
  with 
  a 
  broad 
  white 
  dash 
  

   below 
  the 
  outer 
  transverse 
  line, 
  bordered 
  with 
  black 
  towards 
  the 
  base, 
  

   which 
  cuts 
  the 
  whole 
  length 
  of 
  the 
  fringes. 
  Below 
  the 
  first 
  transverse 
  

   line 
  the 
  fringes 
  of 
  the 
  inner 
  margin 
  are 
  sometimes, 
  for 
  their 
  whole 
  

   length, 
  cut 
  through 
  with 
  white, 
  but 
  more 
  narrowly 
  than 
  below 
  the 
  

   outer 
  band, 
  and 
  beset 
  with 
  single, 
  coarse, 
  white 
  scales. 
  This 
  second 
  

   white 
  dash 
  is 
  bordered 
  outwardly 
  with 
  black 
  scales. 
  Hindwings, 
  

   together 
  with 
  the 
  fringes, 
  grey, 
  only 
  at 
  the 
  apex 
  of 
  the 
  3rd 
  plumule 
  

   are 
  a 
  few 
  white 
  hair-scales. 
  Underside 
  grey 
  ; 
  the 
  white 
  dashes 
  in 
  the 
  

   fringes 
  of 
  both 
  lobes, 
  as 
  well 
  as 
  the 
  outer 
  transverse 
  line 
  on 
  the 
  upper 
  

  

  * 
  Hofmann 
  has 
  Hohe 
  ( 
  = 
  height), 
  but 
  I 
  suspect 
  this 
  must 
  be 
  a 
  misprint 
  for 
  

   Nahe 
  ( 
  = 
  neighbourhood) 
  (Sich). 
  

  

  