﻿183 
  

  

  TWO 
  NEW 
  CHALCIDOID 
  PARASITES. 
  

   By 
  James 
  Waterston, 
  B.D., 
  D.Sc. 
  

  

  The 
  Imperial 
  Bureau 
  of 
  Entomology 
  has 
  recently 
  received 
  from 
  Fiji 
  two 
  examples 
  

   of 
  a 
  Trichogrammatid 
  bred 
  from 
  eggs 
  of 
  a 
  Hispid, 
  Promecotheca 
  reichei, 
  Baly, 
  that 
  

   mines 
  in 
  leaves 
  of 
  coconuts, 
  and 
  through 
  the 
  kindness 
  of 
  Dr. 
  G. 
  A. 
  K. 
  Marshall 
  this 
  

   material 
  has 
  been 
  handed 
  to 
  me 
  for 
  examination. 
  As 
  received, 
  the 
  specimens 
  (mounted 
  

   in 
  glycerine 
  under 
  the 
  same 
  cover 
  glass) 
  were 
  too 
  shrivelled 
  to 
  be 
  studied 
  satisfactorily. 
  

   After 
  some 
  colour 
  notes 
  had 
  been 
  made, 
  the 
  wings 
  of 
  each 
  specimen 
  were 
  detached 
  

   and 
  mounted. 
  The 
  bodies 
  were 
  then 
  thoroughly 
  potashed 
  (10 
  per 
  cent.) 
  and 
  trans- 
  

   ferred 
  to 
  glacial 
  acetic 
  in 
  which, 
  owing 
  to 
  their 
  original 
  pallor, 
  they 
  practically 
  

   disappeared. 
  They 
  were 
  accordingly 
  stained 
  for 
  one 
  minute 
  with 
  carbol 
  fuchsin 
  

   (Griibler), 
  washed 
  again 
  in 
  acetic 
  acid, 
  and 
  gradually 
  brought 
  up 
  to 
  pure 
  clove 
  oil 
  

   in 
  which 
  the 
  dissection 
  of 
  one 
  example 
  was 
  completed. 
  Although 
  it 
  is 
  unfortunately 
  

  

  Fig. 
  1. 
  

  

  Chaetostricha 
  cratiiia, 
  Waterst., 
  sp. 
  n. 
  : 
  a, 
  head 
  ; 
  b, 
  portion 
  of 
  eye 
  ; 
  c, 
  antenna 
  ; 
  

   d, 
  detail 
  of 
  ring 
  joint 
  and 
  first 
  funicular 
  ; 
  e, 
  membranous 
  sulcus. 
  

  

  still 
  no 
  easy 
  matter 
  to 
  determine 
  the 
  genera 
  of 
  the 
  Trichogrammatidae, 
  I 
  have 
  no 
  

   hesitation 
  in 
  assigning 
  the 
  insects 
  under 
  discussion 
  to 
  Chaetostricha, 
  Walker, 
  in 
  

   interpreting 
  which 
  I 
  agree 
  with 
  Dr. 
  Kryger's 
  views 
  in 
  his 
  paper 
  on 
  " 
  The 
  European 
  

   Trichogramminae 
  " 
  (Entomologiske 
  Meddelelser, 
  xii, 
  pp. 
  303-305, 
  1918). 
  The 
  

   ring 
  joint 
  in 
  this 
  genus 
  is 
  solid, 
  but 
  in 
  both 
  examples 
  examined 
  the 
  funicular 
  joint 
  

   at 
  the 
  extreme 
  base 
  shows 
  a 
  clear, 
  nearly 
  complete, 
  weakly 
  chitinised 
  ring, 
  which 
  

   must 
  give 
  additional 
  flexibility 
  to 
  the 
  antenna 
  at 
  this 
  point. 
  

  

  (6750) 
  

  

  n2 
  

  

  