﻿540 
  

  

  quantity 
  of 
  frass 
  is 
  left 
  behind 
  to 
  close 
  the 
  canal. 
  By 
  February 
  the 
  

   author 
  found 
  that 
  a 
  large 
  proportion 
  of 
  these 
  bore-holes 
  were 
  empty. 
  

   Though 
  observers 
  in 
  neighbouring 
  districts 
  and 
  in 
  the 
  south 
  had 
  

   observed 
  the 
  presence 
  of 
  C. 
  ambiguella 
  larvae 
  in 
  identical 
  situations, 
  

   he 
  himself 
  failed 
  to 
  do 
  so 
  in 
  his 
  part 
  of 
  Touraine. 
  In 
  many 
  cases 
  

   the 
  remains 
  of 
  larval 
  skins 
  of 
  P. 
  botrana 
  are 
  to 
  be 
  found 
  in 
  these 
  bored 
  

   twigs, 
  and 
  the 
  author 
  is 
  inclined 
  to 
  think 
  that 
  they 
  do 
  not 
  always 
  

   remain 
  in 
  the 
  same 
  twig 
  until 
  the 
  period 
  of 
  pupation, 
  though 
  it 
  is 
  

   possible 
  that 
  these 
  remains 
  may 
  be 
  those 
  of 
  the 
  preceding 
  summer 
  

   generation. 
  In 
  any 
  case, 
  whether 
  as 
  larvae 
  or 
  pupae, 
  he 
  regards 
  them 
  

   as 
  supplying 
  the 
  May 
  flight 
  of 
  moths. 
  He 
  points 
  out 
  that 
  it 
  is 
  obvious 
  

   that 
  they 
  are 
  thus 
  amply 
  protected 
  against 
  the 
  cold 
  of 
  winter, 
  and 
  he 
  

   advises 
  vineyard 
  owners 
  to 
  take 
  the 
  greatest 
  care 
  during 
  the 
  process 
  

   of 
  pruning 
  to 
  cut 
  out 
  all 
  useless 
  wood 
  of 
  the 
  previous 
  year, 
  and 
  to 
  

   destroy 
  all 
  such 
  prunings 
  at 
  once 
  on 
  the 
  spot, 
  and 
  he 
  thinks 
  that 
  in 
  

   this 
  way 
  a 
  very 
  large 
  proportion 
  of 
  the 
  hibernating 
  larvae 
  might 
  be 
  

   destroyed. 
  

  

  Lyne 
  (R. 
  N.). 
  Rhinoceros 
  Beetle 
  Traps. 
  — 
  Trop. 
  Agric, 
  Peradeniya, 
  

   xhi, 
  no. 
  5, 
  May 
  1914, 
  pp. 
  353-354. 
  

  

  The 
  rhinoceros 
  beetle, 
  which 
  breeds 
  in 
  decaying 
  vegetable 
  refuse, 
  

   can 
  be 
  destroyed 
  in 
  inexpensive 
  and 
  easily 
  made 
  traps, 
  constructed 
  

   as 
  follows 
  :■- 
  — 
  ^Round 
  the 
  sides 
  of 
  a 
  hole 
  4 
  feet 
  square 
  and 
  4 
  inches 
  deep 
  

   a 
  wall 
  of 
  bricks 
  or 
  stones 
  about 
  14 
  inches 
  high 
  is 
  built 
  ; 
  the 
  enclosure 
  

   is 
  then 
  filled 
  with 
  small 
  pieces 
  of 
  dead 
  or 
  decaying 
  coconut 
  stems, 
  

   leaves 
  and 
  other 
  vegetable 
  rubbish, 
  and 
  covered 
  with 
  a 
  thin 
  layer 
  of 
  

   soil 
  ; 
  the 
  whole 
  should 
  be 
  watered 
  frequently 
  and 
  covered 
  with 
  pahn 
  

   leaves 
  to 
  keep 
  the 
  trap 
  damp 
  ; 
  the 
  traps 
  may 
  be 
  placed 
  about 
  100 
  

   yards 
  apart 
  and 
  can 
  be 
  used 
  as 
  refuse 
  pits. 
  

  

  At 
  the 
  Peradeniya 
  Experiment 
  Station 
  two 
  such 
  traps 
  were 
  made 
  

   in 
  December 
  1913, 
  and 
  when 
  examined 
  in 
  April 
  1914, 
  each 
  contained 
  

   about 
  100 
  larvae. 
  At 
  Maha-iluppalama, 
  150 
  larvae 
  were 
  captured 
  in 
  

   one 
  trap. 
  Where 
  labour 
  is 
  cheap 
  the 
  larvae 
  are 
  best 
  killed 
  by 
  hand, 
  

   but 
  they 
  may 
  also 
  be 
  destroyed 
  by 
  carbon 
  bisulphide 
  poured 
  into 
  

   holes 
  made 
  with 
  a 
  crowbar 
  [see 
  this 
  Review, 
  Ser. 
  A, 
  ii, 
  p. 
  30]. 
  Dr. 
  

   Friedrichs, 
  who 
  is 
  at 
  present 
  studying 
  this 
  pest 
  in 
  Ceylon, 
  has 
  found 
  

   that 
  by 
  means 
  of 
  these 
  traps 
  the 
  natural 
  enemies 
  may 
  be 
  collected 
  

   and 
  determined 
  [see 
  this 
  Review, 
  Ser. 
  A, 
  ii, 
  pp. 
  26-28]. 
  Even 
  in 
  a 
  

   clean 
  plantation 
  the 
  author 
  thinks 
  that 
  traps 
  may 
  always 
  be 
  usefuUy 
  

   employed, 
  but 
  should 
  not 
  be 
  left 
  longer 
  than 
  two 
  months. 
  

  

  Rutherford 
  (A.). 
  The 
  Mango 
  Weevil. 
  — 
  Trop. 
  Agric, 
  Peradeniya, 
  

   xlii, 
  no. 
  5, 
  May, 
  1914, 
  pp. 
  410-411. 
  

  

  The 
  mango 
  weevil 
  (Cryptorrhynchus 
  niangiferae, 
  F.) 
  is 
  widely 
  

   distributed 
  in 
  India, 
  Ceylon, 
  the 
  Philippines, 
  Madagascar, 
  South 
  

   Africa, 
  Hawaii 
  and 
  elsewhere. 
  A 
  correspondent 
  of 
  the 
  author's 
  

   states 
  that 
  in 
  Labuan 
  only 
  about 
  10 
  per 
  cent, 
  of 
  the 
  mangoes 
  are 
  

   edible, 
  owing 
  to 
  the 
  attacks 
  of 
  what 
  is 
  probably 
  this 
  species, 
  and 
  that 
  

   the 
  insect 
  seems 
  to 
  be 
  spreading 
  there. 
  From 
  one 
  stone 
  two 
  adult 
  

   weevils 
  were 
  obtained, 
  the 
  pulp 
  of 
  the 
  fruit 
  being 
  partially 
  rotten, 
  

   and 
  in 
  the 
  side 
  of 
  the 
  stone 
  there 
  was 
  a 
  hole 
  with 
  blackened 
  edges, 
  the 
  

   contents 
  of 
  the 
  seed 
  being 
  reduced 
  to 
  a 
  black 
  mass 
  of 
  frass. 
  As 
  Green 
  

  

  