﻿62 
  E. 
  BALLARD 
  — 
  TWO 
  PESTS 
  OF 
  MAHOGANY 
  IN 
  NYASALAND. 
  

  

  green, 
  with 
  a 
  broad 
  lateral 
  " 
  flush 
  " 
  of 
  either 
  salmon 
  pink 
  or 
  terracotta. 
  This 
  colour- 
  

   ing 
  is 
  much 
  more 
  noticeable 
  in 
  the 
  young 
  larvae, 
  which 
  appear 
  to 
  be 
  uniformly 
  

   reddish 
  or 
  pink, 
  but 
  in 
  full-grown 
  larvae 
  the 
  colour 
  is 
  much 
  fainter 
  and 
  scarcely 
  

   more 
  than 
  a 
  " 
  flush," 
  as 
  stated 
  above. 
  On 
  each 
  segment 
  are 
  four 
  conspicuous 
  black 
  

   tubercles 
  on 
  each 
  side, 
  and 
  two 
  more 
  latero-ventrally. 
  The 
  thoracic 
  shield 
  is 
  black 
  

   and 
  the 
  head 
  may 
  be 
  black 
  or 
  brown. 
  The 
  pupa 
  is 
  formed 
  in 
  a 
  cocoon 
  of 
  tough 
  white 
  

   silk, 
  and 
  placed 
  under 
  the 
  rough 
  excrescences 
  produced 
  by 
  the 
  borings 
  of 
  the 
  larva. 
  

   The 
  pupation 
  period 
  during 
  the 
  cold 
  weather 
  is 
  a 
  month, 
  in 
  the 
  hot 
  weather 
  the 
  time 
  

   is 
  reduced. 
  

  

  This 
  very 
  troublesome 
  insect 
  is 
  parasitised 
  by 
  an 
  Ichneumon 
  and 
  a 
  Chalcid 
  ; 
  but 
  

   they 
  do 
  not 
  seem 
  to 
  afford 
  a 
  very 
  efficient 
  check, 
  judging 
  from 
  the 
  amount 
  of 
  damage 
  

   done. 
  

  

  