﻿REPORT 
  OF 
  THE 
  STATE 
  ENTOMOLOGIST 
  I908 
  

  

  13 
  

  

  IX7URI0US 
  INSECTS 
  

   Poplar 
  sawfly 
  

  

  Trichiocampus 
  viminalis 
  Fallen 
  

  

  This 
  sawfly, 
  first 
  observed 
  in 
  this 
  country 
  in 
  1888 
  by 
  Dr 
  J. 
  A. 
  

   Lintner, 
  has 
  become 
  rather 
  abundant 
  upon 
  Carolina 
  poplars 
  in 
  the 
  

   vicinity 
  of 
  Albany 
  during 
  recent 
  years. 
  Complaint 
  of 
  injuries 
  by 
  

   this 
  species 
  has 
  also 
  been 
  received 
  

   this 
  season 
  from 
  Cambridge, 
  N. 
  Y. 
  

   Dr 
  Lintner 
  stated 
  in 
  1888 
  that 
  this 
  

   species 
  was 
  so 
  abundant 
  upon 
  small 
  

   poplars 
  in 
  his 
  garden 
  that 
  it 
  was 
  

   necessary 
  to 
  pick 
  and 
  burn 
  the 
  in- 
  

   fested 
  leaves 
  in 
  order 
  to 
  prevent 
  

   more 
  serious 
  injury. 
  

  

  Life 
  history 
  and 
  habits. 
  The 
  

   orange-yellow, 
  black 
  spotted, 
  false 
  

   caterpillars 
  may 
  be 
  seen 
  in 
  early 
  

   June. 
  The 
  young 
  larvae 
  feed 
  in 
  

   company 
  on 
  the 
  under 
  side 
  of 
  the 
  

   foliage, 
  skeletonizing 
  most 
  of 
  the 
  

   leaf. 
  The 
  larvae 
  then 
  break 
  up 
  into 
  

   clusters 
  of 
  6 
  to 
  8 
  or 
  10, 
  migrate 
  to 
  

   other 
  leaves 
  and 
  by 
  this 
  time 
  are 
  

   large 
  enough 
  so 
  that 
  everything 
  is 
  

   devoured 
  except 
  the 
  larger 
  veins, 
  

   feeding 
  invariably 
  beginning 
  at 
  the 
  

   tip 
  of 
  the 
  leaf. 
  The 
  presence 
  of 
  

   leaves 
  eaten 
  in 
  the 
  above 
  described 
  

   ways 
  is 
  most 
  characteristic 
  of 
  this 
  

   species. 
  The 
  larvae 
  attain 
  full 
  

   growth 
  very 
  quickly 
  and 
  some 
  may 
  

   be 
  observed 
  spinning 
  up 
  the 
  latter 
  part 
  of 
  June. 
  The 
  period 
  of 
  

   oviposition 
  is 
  quite 
  extended 
  and 
  eggs, 
  young 
  larvae 
  and 
  full- 
  

   grown 
  larvae 
  may 
  frequently 
  be 
  observed 
  upon 
  the 
  same 
  tree 
  the 
  

   latter 
  part 
  of 
  June 
  and 
  into 
  July. 
  A 
  second 
  generation 
  of 
  larvae 
  

   occurs 
  about 
  the 
  middle 
  of 
  August. 
  The 
  full-grown 
  larvae 
  of 
  the 
  

  

  Fig. 
  r 
  

  

  Poplar 
  sawfly. 
  leaf 
  stem 
  show- 
  

   ing 
  oviposition 
  and 
  a 
  portion 
  of 
  the 
  

   stem 
  greatly 
  enlarged, 
  (Original) 
  

  

  