﻿473 
  

  

  species 
  is 
  the 
  representative 
  of 
  a 
  new 
  genus, 
  related 
  to 
  RhopalicuSy 
  

   to 
  which 
  also 
  belong 
  PteromaJus 
  einersbergensis, 
  Rtzb., 
  and 
  another 
  

   species 
  reared 
  at 
  the 
  Station 
  of 
  Poltava 
  from 
  /. 
  noxiale. 
  The 
  author 
  

   has 
  reared 
  H. 
  vassiUevi 
  as 
  a 
  parasite 
  of 
  /. 
  ereniitum, 
  var. 
  nodale. 
  The 
  

   mode 
  of 
  oviposition 
  is 
  different 
  from 
  that 
  of 
  all 
  other 
  parasites 
  of 
  

   Isosoma, 
  the 
  egg 
  being 
  laid 
  not 
  on 
  the 
  larvae 
  of 
  the 
  host, 
  but 
  in 
  the 
  

   wall 
  of 
  the 
  stem 
  in 
  that 
  internode 
  in 
  ^vhich 
  the 
  larva 
  of 
  /. 
  eremUxnf, 
  

   is 
  present. 
  After 
  hatching, 
  the 
  larvae 
  crawl 
  for 
  one 
  or 
  two 
  days 
  over 
  

   the 
  body 
  of 
  the 
  host, 
  and 
  first 
  destroy 
  each 
  other, 
  the 
  surviving 
  

   larva 
  killing 
  the 
  host. 
  The 
  larvae 
  pupate 
  the 
  following 
  spring, 
  

   probably 
  in 
  April 
  and 
  May. 
  In 
  1908, 
  82 
  per 
  cent, 
  of 
  larvae 
  of 
  

   /. 
  eremitum 
  were 
  destroyed 
  by 
  this 
  parasite. 
  

  

  In 
  addition 
  to 
  the 
  foregoing, 
  Homoporus 
  sp. 
  and 
  H, 
  cra^sinervis, 
  

   Thoms., 
  were 
  bred 
  from 
  7. 
  rossicum 
  ; 
  Eupelmus 
  sp. 
  and 
  Phetiacra 
  sp. 
  

   from 
  I. 
  noxiale 
  \ 
  Eupelmus 
  sip. 
  from 
  /. 
  eremitum; 
  and 
  Eupelmus 
  

   d^geeri, 
  Dalm., 
  and 
  Eurijto 
  ma 
  sip. 
  from 
  P. 
  apterum. 
  

  

  The 
  author 
  has 
  not 
  noticed 
  attacks 
  on 
  Isosoma 
  by 
  Pediculoides 
  

   (Heteropus) 
  ventricosus, 
  Newp., 
  as 
  recorded 
  in 
  America, 
  but 
  thinks 
  it 
  

   probable 
  that 
  this 
  is 
  also 
  the 
  case 
  in 
  Russia, 
  where 
  these 
  mites 
  are 
  

   often 
  found 
  in 
  rye 
  and 
  wheat 
  fields. 
  

  

  The 
  species 
  of 
  Isosoma 
  are 
  widely 
  distributed 
  in 
  Russia, 
  except 
  in 
  

   the 
  north. 
  The 
  author 
  says 
  that 
  in 
  Cherson 
  the 
  borders 
  of 
  the 
  fields 
  

   are 
  more 
  seriously 
  infested 
  than 
  the 
  centres, 
  but 
  the 
  damage 
  done 
  by 
  

   Isosoma 
  to 
  grain 
  is 
  less 
  than 
  that 
  done 
  by 
  such 
  pests 
  as 
  the 
  Hessian 
  

   fly, 
  etc., 
  Isosoma 
  rossicum. 
  being 
  the 
  most 
  injurious. 
  The 
  average 
  

   loss 
  of 
  weight 
  of 
  grain 
  attacked 
  by 
  P. 
  apterum 
  is 
  only 
  ^\, 
  but 
  the 
  

   damage 
  may 
  be 
  much 
  greater 
  in 
  exceptional 
  years. 
  

  

  The 
  last 
  chapter 
  is 
  devoted 
  to 
  remedies 
  against 
  Isosoma. 
  The 
  

   author 
  recommends 
  the 
  rotation 
  of 
  crops, 
  attention 
  being 
  paid 
  to 
  the 
  

   possibility 
  of 
  these 
  pests 
  breeding 
  on 
  grasses 
  and 
  w^eeds. 
  Stubble 
  

   and 
  straw 
  should 
  be 
  burnt. 
  As 
  Isosoma 
  rossicum 
  and 
  /. 
  noxiale 
  

   occupy 
  the 
  third 
  and 
  fourth 
  internodes 
  the 
  stubble 
  must 
  be 
  left 
  of 
  

   such 
  a 
  length 
  as 
  to 
  include 
  these 
  parts 
  of 
  the 
  plant 
  and 
  then 
  burnt. 
  

   Isosoma 
  eremitum 
  is 
  usually 
  removed 
  with 
  the 
  straw, 
  while 
  P. 
  apterum 
  

   remains 
  in 
  the 
  stubble. 
  If 
  by 
  experiment 
  the 
  percentage 
  of 
  parasites 
  

   is 
  found 
  to 
  be 
  large, 
  they 
  can 
  be 
  transported 
  from 
  one 
  locality 
  to 
  

   another 
  by 
  simply 
  transferring 
  the 
  straw 
  or 
  stubble. 
  

  

  PoRTCHiNSKY 
  (I. 
  A.). 
  riapasHTbi 
  capaHMM, 
  npycMKa 
  w 
  speAHbixii 
  

  

  BMAOBli 
  KOGblJlOK'b 
  H31> 
  MJpa 
  HactKOMblX-b, 
  OTKpblTbie 
  AO 
  CMX-b 
  

  

  nop-b 
  Bi> 
  PocciM. 
  napa3MTbi 
  Ms-b 
  oTpnAa 
  mecTOKpunbix-b. 
  

  

  [Insect 
  parasites 
  of 
  Locusts 
  and 
  of 
  noxious 
  Acridians 
  found 
  up 
  till 
  

   now 
  in 
  Russia. 
  Part 
  1, 
  Coleopterous 
  Parasites.] 
  — 
  «TpyAbl 
  Biopo 
  

   no 
  3HTOMonoriM 
  YMeHaro 
  KoMMTera 
  fnae. 
  Ynpae. 
  3. 
  m 
  3.» 
  

  

  [Memoirs 
  of 
  the 
  Bureau 
  of 
  Entomology 
  of 
  the 
  Scientific 
  Com- 
  

   mittee 
  of 
  the 
  Central 
  Board 
  of 
  Land 
  Admistration 
  and 
  Agri- 
  

   culture,'] 
  St, 
  Petersburg, 
  1914, 
  xi, 
  no. 
  1, 
  68 
  pp. 
  22 
  figs., 
  2 
  pis. 
  

  

  In 
  an 
  introduction 
  to 
  his 
  work 
  the 
  author 
  points 
  out 
  that 
  locusts 
  are 
  

   only 
  parasitised 
  as 
  eggs 
  and 
  imagines, 
  these 
  being 
  the 
  stages 
  in 
  which 
  

   it 
  is 
  most 
  difficult 
  for 
  man 
  to 
  deal 
  with 
  them. 
  Control 
  measures 
  

   should 
  be 
  directed 
  against 
  the 
  larval 
  stage, 
  which 
  is 
  not 
  attacked 
  by 
  

  

  (C46) 
  E 
  

  

  