﻿621 
  

  

  Allotria 
  nymphs 
  are 
  protected 
  by 
  the 
  dried 
  integuments 
  of 
  their 
  host^ 
  

   whilst 
  Trioxys 
  have, 
  in 
  addition, 
  a 
  white, 
  silken 
  cocoon. 
  Two 
  of 
  the 
  

   authors' 
  experiments 
  were 
  as 
  follows 
  : 
  — 
  On 
  the 
  9th 
  and 
  10th 
  June 
  

   1913, 
  they 
  released 
  20 
  T. 
  auctiis 
  in 
  a 
  breeding 
  cage 
  in 
  which 
  two 
  beets 
  

   were 
  placed, 
  on 
  the 
  leaves 
  of 
  which 
  about 
  a 
  thousand 
  A. 
  euonymi 
  

   were 
  feeding. 
  On 
  the 
  2nd 
  July 
  over 
  500 
  Aphids 
  were 
  parasitised 
  and 
  

   dead. 
  In 
  the 
  second 
  experiment 
  about 
  a 
  thousand 
  Aphidius 
  crepidis 
  

   and 
  Trioxys 
  auctus 
  were 
  released 
  early 
  in 
  July 
  in 
  the 
  small 
  garden 
  of 
  

   the 
  laboratory, 
  where 
  tens 
  of 
  thousands 
  of 
  Aphids 
  lived 
  on 
  the 
  spindle 
  

   tree 
  and 
  on 
  a 
  number 
  of 
  intermediate 
  plants, 
  such 
  as 
  sugar 
  and 
  seed 
  

   beet, 
  Lysimachia 
  vulgaris, 
  Epilohium 
  spicatum, 
  nettles, 
  etc. 
  By 
  the 
  

   15th 
  August 
  it 
  was 
  impossible 
  to 
  find 
  a 
  single 
  healthy 
  Aphid. 
  

  

  Barbey 
  (A.). 
  Les 
  Bostryches. 
  [Bostrychidae.] 
  — 
  Bull 
  Soc. 
  Etude 
  

   Vulg. 
  Zool. 
  Agric 
  , 
  Bordeaux, 
  xiii, 
  nos. 
  3, 
  4, 
  5 
  & 
  6, 
  March, 
  April,. 
  

   May 
  & 
  June 
  1914 
  ; 
  pp. 
  41-45, 
  55-62, 
  74-81, 
  94-96 
  ; 
  22 
  figs 
  ; 
  1 
  pi. 
  

  

  Eighty 
  to 
  ninety 
  species 
  of 
  Bostrychidae 
  occur 
  in 
  the 
  forests 
  of 
  

   Central 
  Europe, 
  where 
  they 
  are 
  the 
  most 
  dangerous 
  of 
  the 
  xylophagoua 
  

   pests. 
  According 
  to 
  Shevirev, 
  in 
  the 
  case 
  of 
  the 
  more 
  important 
  

   species 
  such 
  as 
  Ips 
  (Tomicus) 
  typographus, 
  L., 
  and 
  Hylurgus 
  (Myelo- 
  

   philus) 
  piniperda, 
  L., 
  an 
  examination 
  of 
  the 
  galleries 
  is 
  sufficient 
  to 
  

   determine 
  whether 
  a 
  tree 
  has 
  been 
  attacked 
  before 
  or 
  after 
  felling. 
  

   In 
  the 
  first 
  case, 
  a 
  blade 
  of 
  grass 
  introduced 
  into 
  the 
  bore-hole 
  ^^^ll 
  

   follow 
  the 
  direction 
  of 
  the 
  grain, 
  whilst 
  in 
  the 
  second 
  it 
  will 
  point 
  in 
  

   various 
  directions, 
  usually 
  transverse. 
  In 
  the 
  plains, 
  Ips 
  typographus 
  

   swarms 
  towards 
  the 
  end 
  of 
  April 
  if 
  the 
  weather 
  is 
  fine. 
  The 
  first 
  gene- 
  

   ration 
  completes 
  its 
  cycle 
  in 
  from 
  10 
  to 
  13 
  weeks, 
  the 
  second 
  generation 
  

   appearing 
  at 
  the 
  end 
  of 
  August. 
  Severe 
  infestation 
  may 
  cause 
  the 
  

   insects 
  to 
  attack 
  healthy 
  trees 
  for 
  lack 
  of 
  suitable 
  weak 
  specimens. 
  

   The 
  only 
  direct 
  control 
  at 
  present 
  available 
  consists 
  of 
  trapping 
  by 
  

   means 
  of 
  felled 
  trees. 
  If 
  the 
  trunks 
  are 
  barked 
  at 
  the 
  time 
  that 
  

   oviposition 
  takes 
  place, 
  the 
  larvae 
  and 
  eggs 
  are 
  soon 
  destroyed 
  by 
  

   sun 
  and 
  rain, 
  though 
  the 
  adults 
  are 
  less 
  easily 
  killed. 
  

  

  PiCARD 
  (F.). 
  Les 
  insectes 
  du 
  groseillier 
  et 
  du 
  framboisier. 
  [Gooseberry 
  

   and 
  raspberry 
  pests.] 
  — 
  Progres 
  Agric. 
  Vitic, 
  Montpellier, 
  xxxi, 
  

   no. 
  23, 
  7th 
  June 
  1914, 
  pp. 
  713-720, 
  1 
  pi. 
  

  

  The 
  following 
  insects 
  chiefly 
  attack 
  the 
  raspberry 
  : 
  — 
  Agrilus 
  chryso- 
  

   deres 
  var. 
  rubicola 
  and 
  Bembecia 
  hylaeiformis 
  ; 
  whilst 
  Pteronus 
  

   ribesii, 
  Abraxas 
  grossulariata, 
  Halia 
  wavaria, 
  Aegeria 
  (Sesia) 
  tipuli' 
  

   formis 
  and 
  Eulecanium 
  (Lecanium) 
  corni 
  are 
  almost 
  exclusively 
  pests 
  

   of 
  the 
  gooseberry. 
  A. 
  chrysoderes 
  var. 
  rubicola 
  is 
  a 
  Buprestid 
  which 
  

   lays 
  its 
  eggs 
  in 
  the 
  bark 
  and 
  the 
  young 
  larvae 
  of 
  which 
  bore 
  into 
  the 
  

   stems, 
  and 
  as 
  one 
  individual 
  is 
  able 
  to 
  destroy 
  an 
  entire 
  stem, 
  it 
  causes 
  

   severe 
  losses 
  in 
  the 
  raspberry 
  fields 
  of 
  the 
  Cote-d'Or. 
  It 
  is 
  frequently 
  

   parasitised 
  by 
  the 
  Chalcid, 
  Entedon 
  (Tetrastichus) 
  agrilorum. 
  When 
  

   pruning 
  in 
  winter, 
  all 
  stems 
  which 
  show 
  signs 
  of 
  the 
  larva 
  being 
  

   present 
  must 
  be 
  cut 
  as 
  close 
  to 
  the 
  ground 
  as 
  possible 
  and 
  burnt. 
  

  

  