﻿366 
  Mr. 
  F. 
  Enock's 
  life-history 
  of 
  the 
  Hessian 
  Fly. 
  

  

  Explanation 
  of 
  Plate 
  XVI. 
  

  

  Fig. 
  1. 
  Lateral 
  and 
  ventral 
  view 
  of 
  head 
  of 
  larva 
  (one 
  day 
  old) 
  of 
  

   Hessian 
  Fly, 
  x 
  140 
  diam. 
  

  

  2. 
  Lateral 
  and 
  ventral 
  view 
  of 
  feeding 
  larva, 
  x 
  8 
  diam. 
  

  

  3. 
  Lateral 
  and 
  ventral 
  view 
  of 
  liead 
  of 
  feeding 
  larva, 
  x 
  

  

  36 
  diam. 
  

  

  4. 
  Lateral 
  and 
  ventral 
  view 
  of 
  puparium, 
  x 
  8 
  diam. 
  

  

  6. 
  Lateral 
  and 
  ventral 
  view 
  of 
  third 
  stage 
  of 
  larva, 
  x 
  8 
  diam, 
  

  

  6. 
  Lateral 
  and 
  ventral 
  view 
  of 
  1st, 
  2nd, 
  and 
  3rd 
  segments 
  of 
  

  

  ditto, 
  showing 
  the 
  head 
  and 
  anchor-process, 
  x 
  36 
  diam. 
  

  

  7. 
  Head 
  and 
  anchor-process 
  after 
  having 
  been 
  squeezed 
  flat, 
  

  

  X 
  36 
  diam. 
  

  

  8. 
  Lateral 
  and 
  ventral 
  view 
  of 
  pupa, 
  x 
  8 
  diam. 
  

  

  9. 
  Vertical 
  section 
  through 
  centre 
  of 
  barley-stalk, 
  showing 
  a 
  

  

  feeding 
  larva 
  in 
  situ. 
  

  

  10. 
  Vertical 
  section 
  through 
  centre 
  of 
  bent 
  barley-stalk 
  ; 
  

  

  puparium 
  in 
  situ. 
  

  

  11. 
  Vertical 
  section 
  through 
  centre 
  of 
  bent 
  barley-stalk 
  ; 
  

  

  Brd 
  stage 
  larva 
  in 
  situ 
  within 
  the 
  puparium, 
  head 
  

   dow7iwards 
  and 
  inwards 
  towards 
  the 
  stalk. 
  

  

  12. 
  Vertical 
  section 
  through 
  centre 
  of 
  bent 
  barley- 
  stalk 
  ; 
  

  

  3rd 
  stage 
  larva 
  commencing 
  to 
  turn 
  round. 
  

  

  13. 
  Ditto, 
  ditto, 
  further 
  advanced. 
  

  

  14. 
  Ditto, 
  ditto, 
  half-way 
  round. 
  

  

  15. 
  Ditto, 
  ditto, 
  three-quai'ters 
  round. 
  

  

  16. 
  Ditto, 
  ditto, 
  larva 
  reversed, 
  showing 
  head 
  upwards 
  and 
  

  

  outwards 
  towards 
  the 
  leaf-sheath. 
  

  

  17. 
  Vertical 
  section 
  through 
  centre 
  of 
  bent 
  barley-stalk 
  ; 
  

  

  pupa 
  within 
  puparium, 
  and 
  cast 
  skin 
  and 
  anchor- 
  

   process. 
  

  

  18. 
  Bent 
  barley-stalk 
  ; 
  puj)a 
  protruding, 
  previous 
  to 
  the 
  flj' 
  

  

  emerging. 
  

  

  (Figs. 
  9 
  to 
  18 
  magnified 
  5 
  diam.) 
  

  

  