﻿Explanation 
  of 
  Plates. 
  389 
  

  

  Explanation 
  of 
  Plate 
  XVI. 
  

  

  Fig. 
  ] 
  . 
  The 
  scent-scale 
  of 
  Pinacopterijx 
  liliana 
  Grose-Smith, 
  viewed 
  

   on 
  the 
  flat, 
  X 
  500. 
  

  

  a. 
  Central 
  granular 
  area. 
  

  

  b. 
  Accessory 
  disc, 
  superposed 
  upon 
  the 
  lamina, 
  the 
  scale 
  

  

  being 
  viewed 
  from 
  beneath. 
  

  

  c. 
  Trumpet- 
  shaped 
  distal 
  expansion 
  of 
  the 
  footstalk 
  at 
  

  

  ^ts 
  junction 
  with 
  the 
  lamina. 
  

  

  d. 
  Apertm-e 
  of 
  the 
  disc, 
  surrounded 
  by 
  its 
  chitinous 
  ring. 
  

  

  Fig. 
  2. 
  Longitudinal 
  section 
  of 
  fore- 
  wing, 
  x 
  500. 
  

  

  a. 
  Wing- 
  membrane. 
  

  

  6. 
  Socket 
  of 
  ordinary 
  scale 
  of 
  under-surface. 
  

  

  c. 
  ,, 
  „ 
  „ 
  upper- 
  surface. 
  

  

  d. 
  Socket 
  of 
  scent-scale, 
  showing 
  upper 
  and 
  under 
  lip. 
  

  

  Fig. 
  3. 
  Longitudinal 
  section 
  of 
  scent-scale 
  and 
  socket, 
  X 
  500. 
  

  

  a. 
  Lower 
  layer 
  of 
  scale. 
  

  

  b. 
  Upper 
  layer 
  of 
  scale. 
  

  

  c. 
  Central 
  substance, 
  situated 
  in 
  the 
  dorsal 
  portion 
  of 
  

  

  the 
  cavity 
  enclosed 
  between 
  the 
  upper 
  and 
  lower 
  

   layers 
  of 
  the 
  scale. 
  

  

  d. 
  Lamina 
  of 
  the 
  scale. 
  

  

  e. 
  Junction 
  of 
  lamhia 
  with 
  footstalk. 
  

  

  /. 
  Socket 
  of 
  scent-scale 
  enclosmg 
  accessory 
  disc. 
  

   (J. 
  Wing-membrane. 
  

  

  Fig. 
  4. 
  Longitudinal 
  section 
  of 
  scent-scale 
  socket 
  and 
  footstalk, 
  

   X 
  500. 
  

  

  a. 
  Footstalk, 
  arising 
  from 
  about 
  the 
  centre 
  of 
  the 
  ventral 
  

  

  surface 
  of 
  the 
  disc, 
  and 
  curling 
  dorsally 
  over 
  the 
  

   upper 
  margin 
  of 
  the 
  disc. 
  

  

  b. 
  Base 
  of 
  lamma 
  close 
  to 
  the 
  msertion 
  of 
  the 
  footstalk. 
  

  

  c. 
  Wing-membrane. 
  

  

  d. 
  Socket, 
  showing 
  upper 
  and 
  lower 
  lip. 
  

  

  e. 
  Accessory 
  disc. 
  

  

  /. 
  Socket 
  of 
  orduiary 
  scale 
  of 
  lower 
  surface. 
  

  

  