﻿388 
  " 
  Dr. 
  F. 
  A. 
  Dixey 
  on 
  Pinacopteryx 
  liliana. 
  

  

  or 
  segmental 
  area 
  occupying 
  the 
  middle 
  of 
  the 
  proxi- 
  

   mal 
  edge 
  of 
  the 
  disc. 
  When 
  seen 
  in 
  longitudmal 
  section, 
  

   the 
  disc 
  appears 
  to 
  fit 
  into 
  a 
  groove 
  between 
  the 
  upper 
  

   and 
  lower 
  lip 
  of 
  the 
  socket; 
  its 
  proximal 
  margin 
  being 
  

   curled 
  over 
  towards 
  the 
  lower 
  hp, 
  in 
  contact 
  with 
  the 
  

   main 
  substance 
  of 
  the 
  socket. 
  In 
  a 
  fortunate 
  section 
  

   the 
  footstalk 
  may 
  be 
  seen 
  to 
  wind 
  over 
  the 
  distal 
  edge 
  ot 
  

   the 
  disc, 
  and 
  to 
  lie 
  in 
  close 
  juxtaposition 
  with 
  its 
  lower 
  

   surface 
  (PI. 
  XVI, 
  fig. 
  4). 
  Before 
  reaching 
  the 
  curled-over 
  

   part 
  of 
  the 
  disc 
  it 
  disappears, 
  having 
  apparently 
  become 
  

   fused 
  with 
  the 
  disc 
  about 
  midway 
  between 
  the 
  proximal 
  

   and 
  distal 
  edges. 
  I 
  have 
  never 
  succeeded 
  m 
  identifying 
  

   any 
  appearance 
  in 
  these 
  longitudinal 
  sections 
  as 
  due 
  to 
  

   the 
  aperture. 
  In 
  transverse 
  sections, 
  the 
  ordinary 
  sockets 
  

   appear 
  simply 
  as 
  chitinous 
  rings, 
  each 
  enclosing 
  a 
  circular 
  

   or 
  oval 
  lumen. 
  The 
  sockets 
  of 
  the 
  scent-scales 
  besides 
  

   beiuR 
  much 
  larger, 
  are 
  distinguishable 
  by 
  the 
  tact 
  that 
  

   they 
  show 
  a 
  central 
  body 
  oval 
  in 
  outline 
  and 
  staimng 
  

   readily 
  in 
  place 
  of 
  the 
  orifice 
  visible 
  in 
  the 
  ordmary 
  sockets 
  

   This 
  central 
  body 
  is 
  surrounded 
  by 
  a 
  less 
  deeply 
  stained 
  

   zone 
  also 
  oval 
  in 
  outline, 
  and 
  somewhat 
  irregular 
  it 
  the 
  

   section 
  has 
  happened 
  to 
  pass 
  through 
  the 
  socket 
  near 
  its 
  

   insertion 
  in 
  the 
  wing-membrane. 
  In 
  many 
  of 
  the 
  sections 
  

   the 
  disc 
  is 
  seen 
  as 
  a 
  beaded 
  hue 
  crossing 
  the 
  socket 
  m 
  the 
  

   direction 
  of 
  the 
  long 
  axis 
  of 
  the 
  latter, 
  aiid 
  projecting 
  for 
  a 
  

   considerable 
  distance 
  at 
  each 
  end 
  (PI. 
  XVI, 
  fig. 
  7). 
  i 
  have 
  

   never 
  been 
  able 
  to 
  satisfy 
  myself 
  that 
  the 
  footstalk 
  is 
  

   recoanisable 
  in 
  these 
  transverse 
  sections. 
  _ 
  

  

  It 
  is 
  probable 
  that 
  the 
  examination 
  of 
  material 
  properly 
  

   treated 
  while 
  fresh 
  would 
  clear 
  up 
  many 
  points 
  which 
  are 
  

   obscure 
  in 
  the 
  dry 
  condition. 
  I 
  am 
  hoping 
  that 
  it 
  may 
  

   be 
  possible 
  to 
  obtain 
  in 
  course 
  of 
  time 
  some 
  specimens 
  ot 
  

   P. 
  liliana 
  which 
  have 
  been 
  put 
  at 
  once 
  into 
  preservative 
  

   reagents. 
  Meanwhile 
  the 
  facts 
  at 
  present 
  observed 
  seem 
  

   to 
  be 
  sufficiently 
  interesting 
  to 
  be 
  placed 
  on 
  record 
  m 
  this 
  

   brief 
  communication. 
  . 
  , 
  

  

  I 
  am 
  greatly 
  indebted 
  to 
  my 
  friend 
  Dr. 
  H 
  Eltringham 
  

   for 
  the 
  care 
  and 
  skill 
  which 
  he 
  has 
  employed 
  m 
  makmg 
  

   the 
  sections 
  described 
  and 
  figured 
  in 
  the 
  present 
  paper. 
  

  

  