﻿353 
  

  

  the 
  plants 
  pass 
  through 
  their 
  critical 
  stage 
  so 
  far 
  as 
  this 
  pest 
  is 
  con- 
  

   cerned 
  ; 
  to 
  sow 
  winter 
  crops 
  more 
  closely 
  in 
  those 
  years 
  when 
  out- 
  

   breaks 
  of 
  the 
  pests 
  have 
  occurred 
  (Ormerod 
  and 
  Rostrup) 
  and 
  to 
  sow 
  

   rye 
  instead 
  of 
  wheat 
  (Rostrup). 
  The 
  author 
  is 
  of 
  opinion 
  that 
  harrow- 
  

   ing 
  the 
  fields 
  in 
  spring 
  may 
  be 
  unfavourable 
  to 
  the 
  development 
  of 
  the 
  

   larvae, 
  which 
  at 
  that 
  moment 
  emerge 
  and 
  move 
  to 
  the 
  plants. 
  Further 
  

   investigations 
  are 
  necessary 
  to 
  show 
  the 
  decrease 
  in 
  the 
  percentage 
  of 
  

   injured 
  plants 
  in 
  fields 
  where 
  this 
  remedy 
  has 
  been 
  appHed, 
  as 
  well 
  as 
  

   to 
  find 
  out 
  the 
  best 
  time 
  for 
  sowing 
  winter 
  crops. 
  

  

  Borodin 
  (Dm). 
  fl-feiiCTBie 
  6aKTepiM 
  fle 
  3penjifl 
  Ha 
  nepejieTHyio 
  

   capaHHy. 
  [On 
  the 
  influence 
  of 
  Coccobacillus 
  acridiorum, 
  d'Herelle, 
  

   on 
  Locusta 
  (Pachytylus) 
  migratoria, 
  L.] 
  Reprint 
  from 
  « 
  3hT0M0- 
  

   JlorMMeCKiil 
  B'bCTHMKT3.» 
  [Entomological 
  Messenger], 
  Kiev, 
  ii, 
  

   no. 
  1, 
  1914, 
  31 
  pp. 
  

  

  In 
  the 
  summer 
  of 
  1913, 
  the 
  author 
  was 
  in 
  the 
  government 
  of 
  Stavropol 
  

   (North 
  Caucasus) 
  and 
  made 
  experiments 
  in 
  injecting 
  cultures 
  of 
  

   d'Herelle's 
  Coccohacillus 
  acridiorum 
  into 
  the 
  abdominal 
  cavity 
  of 
  the 
  

   following 
  Orthoptera 
  : 
  — 
  Locusta 
  migratoria, 
  L., 
  Oedaleus 
  nigrofasciatus, 
  

   De 
  G., 
  Stauronotus 
  maroccanus, 
  Thunb., 
  Arcyptera 
  flavicosta, 
  Fisch., 
  

   and 
  T 
  metis 
  muricatus, 
  Pall. 
  (1) 
  These 
  injections 
  were 
  pathogenic 
  for 
  

   all 
  these 
  insects 
  and 
  brought 
  about 
  death 
  in 
  83 
  hours. 
  (2) 
  The 
  virulence 
  

   had 
  been 
  increased 
  by 
  passing 
  the 
  infection 
  through 
  many 
  series 
  of 
  

   L. 
  migratoria. 
  (3) 
  The 
  increase 
  of 
  the 
  pathogenic 
  strength 
  of 
  the 
  

   culture 
  was 
  ascertained 
  ; 
  in 
  the 
  first 
  two 
  series 
  death 
  resulted 
  in 
  83 
  

   hours, 
  while 
  in 
  the 
  following 
  series 
  (up 
  to 
  the 
  14th) 
  the 
  time 
  decreased 
  

   to 
  6 
  hours. 
  (4) 
  All 
  the 
  insects 
  do 
  not 
  die 
  in 
  the 
  earher 
  series, 
  some 
  

   continue 
  to 
  five 
  and 
  may 
  possibly 
  acquire 
  immunity 
  . 
  (5) 
  Death 
  results 
  

   more 
  or 
  less 
  quickly 
  according 
  to 
  the 
  conditions 
  of 
  the 
  experiment 
  

   (temperature 
  and 
  amount 
  of 
  culture 
  injected). 
  (6) 
  If 
  the 
  injection 
  is 
  

   effected 
  by 
  the 
  mouth, 
  death 
  results 
  very 
  slowly 
  and 
  all 
  the 
  insects 
  

   do 
  not 
  die. 
  (7) 
  This 
  shows 
  that 
  the 
  bacteriological 
  method 
  of 
  locust 
  

   destruction 
  should 
  be 
  avoided 
  until 
  the 
  question 
  has 
  been 
  more 
  

   thoroughly 
  studied. 
  So 
  far, 
  the 
  method 
  of 
  destruction 
  by 
  poisoned 
  

   baits 
  has 
  no 
  rival. 
  

  

  Leon 
  AUDI 
  (G.). 
  Contributo 
  alia 
  conoscenza 
  delle 
  Cocciniglie 
  dell' 
  Africa 
  

   occidentale 
  e 
  meridionale. 
  [A 
  contribution 
  to 
  the 
  knowledge 
  of 
  

   the 
  Coccids 
  of 
  West 
  and 
  South 
  Africa.] 
  — 
  Boll. 
  Lab. 
  Zool. 
  Agrar. 
  

   R. 
  Scuola 
  Sup. 
  Agric, 
  Portici, 
  viii, 
  1914, 
  pp. 
  187-224, 
  33 
  figs. 
  

  

  In 
  this 
  paper 
  the 
  author 
  deals 
  with 
  the 
  Diaspids 
  from 
  the 
  collection 
  

   of 
  Coccids 
  made 
  by 
  Professor 
  Fihppo 
  Silvestri 
  during 
  his 
  African 
  

   journey 
  (1912-13). 
  The 
  following 
  species 
  are 
  new 
  : 
  — 
  Diaspis 
  newsteadi, 
  

   found 
  on 
  a 
  plant 
  of 
  undetermined 
  species 
  ; 
  Aspidiotus 
  transvaalensis, 
  

   on 
  the 
  leaves 
  of 
  Neriutn 
  oleander 
  ; 
  Aonidia 
  simplex, 
  on 
  an 
  undetermined 
  

   plant 
  ; 
  Dinaspis 
  distincta, 
  on 
  the 
  bark 
  of 
  an 
  undetermined 
  plant 
  ; 
  

   Dinaspis 
  lounsburyi, 
  on 
  two 
  undetermined 
  plants 
  ; 
  all 
  the 
  above 
  

   from 
  Pretoria. 
  Diaspis 
  tricuspidata 
  found 
  on 
  the 
  bark 
  of 
  an 
  

   imdetermined 
  plant 
  in 
  Nigeria 
  ; 
  Howardia 
  silvestrii, 
  Aspidiotus 
  

   unguiculatus, 
  Pseudaonidia 
  ferox 
  var. 
  perspinosa, 
  Chrysomphalu^ 
  

   greeni, 
  Dinaspis 
  giffardi, 
  Dinaspis 
  pseudomorpha, 
  Dinaspis 
  silvestrii 
  

  

  C37 
  B 
  

  

  