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  may 
  be 
  clouded 
  with 
  fuscous. 
  Yariella 
  is 
  distinctly 
  the 
  spotted 
  and 
  

   clouded 
  form 
  of 
  this 
  species, 
  and 
  there 
  is 
  good 
  excuse 
  for 
  the 
  older 
  

   writers 
  who 
  considered 
  it 
  a 
  separate 
  species 
  from 
  the 
  radiated 
  

   insects. 
  

  

  Ab. 
  flaviciliata, 
  Haw., 
  545, 
  Steph. 
  

  

  The 
  forewings 
  are 
  white 
  with 
  a 
  pale 
  ochreous 
  tint 
  and 
  the 
  cilia 
  

   ochreous 
  yellow. 
  In 
  some 
  specimens 
  the 
  wings 
  are 
  unicolorous, 
  

   other 
  examples 
  may 
  have 
  a 
  few 
  dark 
  dots 
  on 
  the 
  disc. 
  This 
  is 
  an 
  

   albescent 
  form. 
  It 
  is 
  parallel 
  with 
  the 
  ab. 
  ochrohuca 
  of 
  R. 
  

   parenthesella, 
  and 
  care 
  is 
  required 
  in 
  separating 
  these 
  two. 
  The 
  

   broader 
  forewing 
  and 
  the 
  more 
  distinctly 
  ringed 
  antennae 
  of 
  the 
  

   latter 
  are 
  points 
  to 
  be 
  observed. 
  

  

  It 
  appears 
  to 
  me 
  that 
  the 
  ancestral 
  form 
  of 
  this 
  species 
  was 
  ab. 
  

   unitella, 
  a 
  plain 
  unmarked 
  insect, 
  from 
  which 
  all 
  the 
  other 
  aberra- 
  

   tions 
  have 
  arisen. 
  In 
  a 
  long 
  series 
  of 
  ab. 
  unitella 
  we 
  can 
  trace 
  the 
  

   first 
  faint 
  beginnings 
  of 
  all 
  the 
  rayed 
  forms 
  and 
  of 
  ab. 
  variella. 
  

   The 
  abs. 
  mtimitrella 
  and 
  quinquepunctata 
  evidently 
  take 
  their 
  origin 
  

   from 
  variella 
  and 
  these 
  two 
  probably 
  represent 
  the 
  most 
  modern 
  

   development 
  of 
  the 
  species. 
  It 
  would 
  be 
  exceedingly 
  interesting 
  to 
  

   rear 
  this 
  species 
  on 
  Mendelian 
  lines. 
  I 
  have 
  no 
  doubt 
  that 
  all 
  the 
  

   forms 
  and 
  perhaps 
  others 
  might 
  be 
  so 
  obtained. 
  The 
  imago 
  

   hibernates, 
  but 
  if 
  copulation 
  takes 
  place 
  in 
  the 
  spring 
  the 
  selection 
  

   of 
  parents 
  and 
  the 
  rearing 
  of 
  the 
  offspring 
  should 
  not 
  be 
  difficult. 
  

  

  Hypsilop/ius 
  parenthesella, 
  L. 
  " 
  F.S." 
  1435. 
  costella, 
  Fab. 
  Wood., 
  

   fig. 
  1537. 
  

  

  The 
  usual 
  form 
  of 
  this 
  species 
  has 
  the 
  forewings 
  reddish 
  ochreous 
  

   with 
  a 
  broad 
  white 
  patch 
  just 
  below 
  the 
  costa 
  extending 
  from 
  the 
  

   base 
  to 
  the 
  middle 
  of 
  the 
  wing. 
  The 
  ground 
  colour 
  ranges 
  from 
  

   pale 
  golden 
  ochreous 
  to 
  deep 
  purple 
  brown 
  and 
  may 
  be 
  almost 
  

   spotless 
  or 
  may 
  bear 
  numerous 
  black 
  dots 
  and 
  strigula^. 
  The 
  white 
  

   costal 
  blotch 
  may 
  be 
  quite 
  absent 
  or 
  may 
  be 
  represented 
  by 
  a 
  lighter 
  

   shade 
  of 
  the 
  ground 
  colour 
  in 
  that 
  area. 
  Sometimes 
  it 
  is 
  a 
  mere 
  

   white 
  streak. 
  Huebner's 
  figure 
  of 
  costella 
  (107) 
  shows 
  a 
  narrow 
  but 
  

   rather 
  deep 
  notch 
  at 
  the 
  termination 
  of 
  the 
  white 
  patch, 
  but 
  this 
  

   margin 
  is 
  more 
  often 
  entire. 
  On 
  the 
  other 
  hand 
  the 
  white 
  patch 
  

   may 
  include 
  the 
  costa 
  and 
  extend 
  to 
  three 
  fourths 
  of 
  the 
  wing 
  

   towards 
  the 
  apex. 
  It 
  is 
  sometimes 
  bordered 
  by 
  a 
  dark 
  shade, 
  

   occasionally 
  the 
  border 
  below 
  the 
  spot 
  is 
  extended 
  as 
  a 
  dark 
  line 
  to 
  

   the 
  apex 
  of 
  the 
  wing. 
  Many 
  specimens 
  show 
  the 
  second 
  smaller 
  

   white 
  blotch 
  mentioned 
  by 
  Stephens 
  as 
  lying 
  at 
  the 
  anal 
  angle. 
  

   Some 
  examples 
  exhibit 
  distinct 
  rays 
  on 
  the 
  costal 
  half 
  of 
  the 
  fore- 
  

   wing. 
  However, 
  in 
  all 
  these 
  minor 
  variations 
  and 
  gradations 
  we 
  

   can 
  easily 
  recognise 
  the 
  insects 
  as 
  parenthesella 
  and 
  there 
  seems 
  to 
  

   be 
  no 
  necessity 
  for 
  special 
  names. 
  

  

  Ab. 
  fissella, 
  Dup. 
  (non 
  Hb.) 
  " 
  His. 
  Nat.," 
  vol. 
  xi., 
  pi. 
  293, 
  Fig.7. 
  

  

  Duponchel's 
  figure 
  depicts 
  the 
  insect 
  with 
  a 
  second 
  white 
  patch 
  

   along 
  the 
  basal 
  half 
  of 
  the 
  dorsum 
  and 
  a 
  central 
  dark 
  streak. 
  I 
  

  

  