﻿S8.—GRACILLARIA 
  SOY 
  ELLA, 
  VAN 
  DEV., 
  AND 
  ITS 
  PARASITE 
  

   ASYMPIESIELLA 
  INDIA, 
  GIRAULT. 
  

  

  (Plate 
  XLIX) 
  

  

  By 
  G. 
  R. 
  DuTT, 
  B.A., 
  Personal 
  Assistant 
  to 
  the 
  Imperial 
  Entomologist. 
  

  

  Gracillaria 
  soyella, 
  van 
  Dev., 
  occurs 
  every 
  year 
  at 
  Pusa 
  and 
  is 
  usually 
  

   found 
  in 
  Tur 
  {Cajanus 
  indicus) 
  fields 
  from 
  November 
  to 
  March-April. 
  

   The 
  caterpillar 
  rolls 
  up 
  the 
  apical 
  extremity 
  of 
  Tur 
  leaves 
  in 
  the 
  way 
  

   shown 
  on 
  the 
  plate 
  and 
  lives 
  within 
  the 
  fold, 
  eating 
  the 
  epidermis 
  from 
  

   inside. 
  In 
  the 
  worst 
  cases 
  of 
  damage 
  the 
  folded 
  portion 
  of 
  the 
  leaf 
  

   is 
  skeletonized 
  and 
  consequently 
  dries 
  up. 
  The 
  injury 
  therefore 
  

   is 
  to 
  a 
  portion 
  of 
  the 
  leaf 
  only. 
  Caterpillars 
  of 
  the 
  family 
  Gracillariadee 
  

   are 
  generally 
  leaf-miners, 
  but 
  the 
  caterpillars 
  of 
  this 
  species 
  behave 
  as 
  

   leaf-folders. 
  A 
  nearly 
  full 
  grown 
  larva 
  measures 
  5 
  mm. 
  long 
  by 
  1 
  mm. 
  

   broad 
  ; 
  more 
  or 
  less 
  cylindrical, 
  very 
  slightly 
  narrowed 
  towards 
  the 
  tail 
  

   end. 
  The 
  segments 
  into 
  which 
  the 
  whole 
  body 
  is 
  divided 
  are 
  quite 
  

   distinct, 
  and 
  are 
  13 
  in 
  number 
  including 
  the 
  head. 
  The 
  whole 
  body 
  

   bears 
  sparse 
  erect 
  hairs 
  of 
  dirty 
  white 
  colour, 
  the 
  general 
  colour 
  of 
  the 
  

   whole 
  body 
  being 
  creamy 
  yellow, 
  but 
  some 
  of 
  the 
  caterpillars 
  appear 
  

   green 
  when 
  seen 
  from 
  above, 
  on 
  account 
  of 
  the 
  green 
  food 
  present 
  in 
  

   the 
  alimentary 
  canal 
  being 
  visible 
  through 
  the 
  transparent 
  integu- 
  

   ment. 
  The 
  head 
  is 
  bilobed, 
  of 
  a 
  slightly 
  deeper 
  tint 
  than 
  the 
  rest 
  of 
  

   the 
  body. 
  There 
  are 
  about 
  six 
  raised 
  black 
  circular 
  marks 
  or 
  dots, 
  a 
  

   little 
  behind 
  the 
  base 
  of 
  the 
  mandibles 
  on 
  each 
  side 
  ; 
  they 
  are 
  distri- 
  

   buted 
  into 
  two 
  lots, 
  i.e., 
  four 
  in 
  one 
  lot 
  touching 
  each 
  other, 
  and 
  two 
  in 
  

   the 
  other. 
  The 
  head 
  including 
  mandibles 
  is 
  longer 
  than 
  broad. 
  The 
  

   body 
  is 
  furnished 
  with 
  3 
  pairs 
  of 
  suckerfeet 
  excluding 
  the 
  anal 
  pair 
  

   of 
  claspers. 
  The 
  spiracles 
  are 
  too 
  minute 
  to 
  be 
  seen 
  under 
  an 
  ordinary 
  

   low 
  power 
  hand 
  lens. 
  The 
  extreme 
  tail-end 
  has 
  a 
  brownish 
  spot 
  on 
  

   it. 
  

  

  Pupation 
  takes 
  place 
  inside 
  the 
  leaf-fold. 
  The 
  pupa 
  measures 
  a 
  

   little 
  over 
  5 
  mm. 
  long 
  and 
  1 
  mm. 
  broad 
  across 
  the 
  thoracic 
  region. 
  

   It 
  is 
  cylindrical 
  and 
  tapers 
  towards 
  the 
  tail-end. 
  There 
  are 
  nine 
  dorsal 
  

   and 
  five 
  ventral 
  segments 
  exposed 
  to 
  view. 
  Each 
  segment 
  bears 
  two 
  

   transverse 
  rows 
  of 
  spiny 
  hairs 
  ; 
  those 
  of 
  the 
  anterior 
  row 
  are 
  stouter 
  

   than 
  those 
  of 
  the 
  posterior 
  one. 
  The 
  tail-end 
  is 
  furnished 
  with 
  four 
  

   processes 
  which 
  remain 
  entangled 
  in 
  the 
  silk 
  fibres 
  spun 
  by 
  the 
  full 
  

  

  ( 
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  ) 
  

  

  