﻿14._SUPPLEMENTARY 
  OBSERVATIONS 
  ON 
  BORERS 
  IN 
  SUGAR- 
  

   CANE, 
  RICE, 
  ETC. 
  

  

  (Plates 
  XVI— 
  XXV.) 
  

  

  By 
  C. 
  C. 
  Ghosh, 
  B.A., 
  Assistant 
  Entomologist, 
  Burma 
  {lately 
  Assistant 
  

   to 
  the 
  Imperial 
  Entomologist). 
  

  

  [The 
  information 
  contained 
  in 
  the 
  following 
  paper 
  was 
  collected 
  

   whilst 
  Mr. 
  Ghosh 
  was 
  Insectary 
  Assistant 
  at 
  Pusa, 
  between 
  February 
  

   1919 
  and 
  September 
  1920, 
  when 
  he 
  was 
  transferred 
  to 
  Burma. 
  The 
  

   work 
  at 
  Pusa 
  on 
  Borers 
  was 
  initiated 
  by 
  me 
  and 
  has 
  throughout 
  been 
  

   carried 
  on 
  under 
  my 
  close 
  supervision 
  and 
  is 
  to 
  be 
  considered 
  as 
  a 
  part 
  

   of 
  the 
  activities 
  of 
  the 
  Entomological 
  Section 
  as 
  a 
  whole. 
  I 
  have, 
  

   however, 
  been 
  too 
  busy 
  in 
  other 
  directions 
  to 
  be 
  able 
  to 
  spare 
  time 
  

   to 
  collaborate 
  in 
  writing 
  up 
  these 
  notes, 
  other 
  than 
  editing 
  for 
  press, 
  

   and 
  therefore 
  Mr. 
  Ghosh's 
  name 
  appears 
  as 
  sole 
  author 
  of 
  this 
  paper, 
  

   which 
  should 
  be 
  considered 
  as 
  a 
  supplement 
  to 
  our 
  former 
  paper 
  on 
  this 
  

   subject. 
  — 
  T. 
  Bainbrigge 
  Fletcher.] 
  

  

  Introductory. 
  

  

  Since 
  the 
  first 
  paper 
  (Borers 
  in 
  sugarcane, 
  rice, 
  etc., 
  Proc. 
  Third 
  

   Entl. 
  Meeting, 
  February 
  1919) 
  was 
  written, 
  a 
  further 
  mass 
  of 
  informa- 
  

   tion 
  has 
  been 
  collected 
  on 
  these 
  very 
  important 
  pests. 
  During 
  this 
  

   period 
  there 
  have 
  been 
  opportunities 
  of 
  getting 
  a 
  better 
  idea 
  of 
  the 
  

   external 
  agents 
  of 
  damage 
  and 
  a 
  more 
  correct 
  estimate 
  of 
  their 
  acti- 
  

   vities 
  as 
  pests. 
  As 
  will 
  appear 
  later 
  on, 
  some 
  of 
  them 
  are 
  capable 
  of 
  

   doing 
  far 
  greater 
  damage 
  and 
  that 
  in 
  a 
  much 
  shorter 
  time 
  than 
  probably 
  

   all 
  the 
  internal 
  borers 
  taken 
  together. 
  A 
  few 
  more 
  internal 
  borers 
  

   also 
  have 
  come 
  to 
  light 
  and 
  fresh 
  alternative 
  food 
  plants 
  of 
  several 
  

   borers 
  have 
  been 
  discovered. 
  Therefore 
  additions 
  have 
  been 
  necessary 
  

   to 
  the 
  list 
  of 
  borers 
  and 
  food 
  plants 
  and 
  a 
  change 
  in 
  the 
  key 
  for 
  differen- 
  

   tiating 
  the 
  pupse. 
  The 
  order 
  of 
  treatment 
  in 
  the 
  first 
  paper 
  is 
  followed, 
  

   additions 
  being 
  made 
  where 
  necessary. 
  The 
  key 
  given 
  in 
  this 
  paper 
  

   for 
  pupae 
  therefore 
  supersedes 
  that 
  in 
  the 
  first 
  paper. 
  Illustrations 
  of 
  

   some 
  of 
  the 
  insects 
  included 
  in 
  the 
  first 
  paper 
  were 
  mislaid 
  while 
  the 
  

   paper 
  was 
  going 
  through 
  the 
  press 
  and 
  have 
  been 
  added 
  in 
  this 
  paper. 
  

   This 
  paper, 
  however, 
  does 
  not 
  treat 
  of 
  the 
  insects 
  already 
  dealt 
  with 
  

   in 
  the 
  first 
  paper 
  beyond 
  giving 
  more 
  information 
  in 
  respect 
  of 
  some 
  

  

  ( 
  105 
  ) 
  

  

  