﻿VI 
  

  

  from 
  Mt. 
  Carroll, 
  Illinois; 
  Dr. 
  Lintnor, 
  from 
  Albany 
  and 
  Tivoli, 
  New 
  

   York; 
  Professor 
  Osborn, 
  from 
  Ames 
  and 
  Ft. 
  Dodge, 
  Iowa: 
  Dr. 
  S. 
  A. 
  

   Forbes, 
  from 
  ( 
  -hami^aign, 
  Illinois, 
  and 
  Prof. 
  W. 
  G. 
  Johnson, 
  observed 
  

   it 
  at 
  Hamilton 
  and 
  at 
  Normal, 
  Illinois 
  — 
  in 
  the 
  former 
  locality 
  not 
  nu- 
  

   merons, 
  in 
  the 
  latter 
  plentiful. 
  Other 
  localities 
  reported 
  ^rom 
  Iowa 
  

   are 
  Iowa 
  (vity 
  and 
  Muscatine, 
  the 
  observers 
  being, 
  respectively, 
  

   Mr. 
  Lathrop 
  and 
  Mr. 
  Foster. 
  The 
  attack 
  at 
  Ft. 
  Dodge 
  was 
  a 
  severe 
  

   one. 
  Doubtless 
  this 
  plant-louse 
  is 
  much 
  more 
  thoroughly 
  distributed 
  

   than 
  these 
  reports 
  indicate, 
  for 
  it 
  is 
  not 
  probable 
  that 
  it 
  would 
  ap- 
  

   pear 
  in 
  states 
  so 
  widely 
  separated 
  as 
  New 
  York 
  and 
  Illinois 
  and 
  be 
  

   absent 
  from 
  the 
  intervening 
  territory.*' 
  It 
  is 
  noticeable 
  that 
  the 
  

   places 
  reported 
  are 
  all 
  in 
  the 
  zone 
  of 
  deciduous 
  trees. 
  If 
  further 
  

   reports 
  should 
  similarly 
  circumscribe 
  its 
  distribution, 
  it 
  would 
  in- 
  

   dicate 
  another 
  host 
  plant. 
  More 
  information 
  in 
  regard 
  to 
  the 
  dis- 
  

   tribution 
  would 
  be 
  of 
  much 
  value. 
  

  

  NATURAL 
  ENEMIES 
  OF 
  THE 
  (HERMES. 
  

  

  The 
  natural 
  enemies 
  of 
  Chermes 
  are 
  numerous 
  and 
  active. 
  Those 
  

   coming 
  imder 
  my 
  own 
  observation 
  are 
  as 
  follows: 
  An 
  unknown 
  

   species 
  of 
  Sijvphux: 
  Cln-ysop(( 
  roherfsoni 
  Fitch, 
  and 
  an 
  unknown 
  

   species 
  of 
  the 
  same 
  ^enna: 
  HeiHcrobijis 
  altcrnniis 
  Fitch: 
  Leiico})is 
  

   simple.r 
  Loew: 
  Chilorovus 
  hiviiliienis 
  Muls: 
  and 
  MeijilUi 
  )iici<'iiJ(if(i 
  

   DeG. 
  

  

  Of 
  these, 
  all 
  but 
  the 
  last 
  two 
  were 
  plentiful, 
  the 
  /S/yry>^/^^^ 
  Cln'ijsopd, 
  

   and 
  Hcntcrobius 
  larvae 
  being 
  especially 
  destructive. 
  Regarding 
  the 
  

   Leucopis 
  there 
  still 
  remains 
  a 
  shade 
  of 
  doubt, 
  owing 
  to 
  the 
  fact 
  that 
  

   I 
  did 
  not 
  succeed 
  in 
  observing 
  it 
  actually 
  destroying 
  the 
  CJirrmes; 
  

   but 
  the 
  circumstantial 
  evidence 
  points 
  strongly 
  to 
  the 
  conclusion 
  

   that 
  it 
  does. 
  The 
  ladybirds 
  were 
  not 
  at 
  all 
  plentiful 
  although 
  ob- 
  

   served 
  in 
  t^uite 
  large 
  numbers 
  at 
  a 
  distance 
  of 
  half 
  a 
  mile 
  from 
  

   the 
  grove 
  busily 
  feeding 
  on 
  the 
  pine 
  scale 
  Cliiouaspis 
  piiiifolio'. 
  Just 
  

   at 
  the 
  time 
  my 
  observations 
  ceased 
  the 
  ladybird 
  larv;v 
  began 
  to 
  in- 
  

   crease 
  in 
  the 
  grove, 
  but 
  were 
  still 
  far 
  from 
  plentiful. 
  

  

  I 
  was 
  unable 
  to 
  rear 
  the 
  Sijrphus 
  larva 
  to 
  maturity 
  and 
  am 
  therefore 
  

   ignorant 
  of 
  the 
  species. 
  It 
  may 
  be 
  known 
  in 
  this 
  c;onnection. 
  how- 
  

   ever, 
  by 
  its 
  elongate, 
  wedge-shaped 
  form: 
  by 
  its 
  size 
  — 
  about 
  one 
  

   half 
  inch 
  in 
  length; 
  by 
  its 
  habit 
  of 
  marking 
  itself 
  with 
  the 
  woolly 
  

   excretion 
  of 
  the 
  Cho'Dtes. 
  and 
  by 
  the 
  absence 
  of 
  feet. 
  In 
  addition 
  to 
  

   these 
  means 
  of 
  identification, 
  there 
  are 
  two 
  movements 
  which 
  are 
  

   quite 
  characteristic. 
  \n 
  locomotion 
  the 
  body 
  is 
  extended, 
  the 
  an- 
  

   terior 
  end 
  (armed 
  with 
  very 
  small 
  jaws) 
  is 
  pressed 
  against 
  the 
  sur- 
  

   face 
  on 
  which 
  it 
  is 
  traveling 
  and 
  to 
  which 
  it 
  adheres 
  by 
  means 
  of 
  a 
  

   sticky 
  secretion, 
  while 
  a 
  muscular 
  retraction 
  of 
  the 
  mouth 
  and 
  a 
  

   small 
  area 
  immediately 
  surrounding 
  it 
  forms 
  a 
  sucking 
  disc 
  by 
  

   which 
  the 
  larva 
  remains 
  attached 
  whih^ 
  the 
  posterior 
  end 
  is 
  brought 
  

  

  *Since 
  the 
  above 
  was 
  written 
  I 
  have 
  received 
  a 
  letter 
  from 
  I'rofessor 
  .Joliusou 
  confiriiiintr 
  

   this 
  opinion 
  as 
  to 
  its 
  distribution. 
  Professor 
  Johnson 
  says: 
  "It 
  may 
  interest 
  you 
  to 
  know- 
  

   that 
  the 
  same 
  plant-louse 
  is 
  not 
  an 
  uncommon 
  thinsr 
  in 
  Maryland 
  and 
  the 
  District 
  of 
  Co- 
  

   lumbia. 
  I 
  saw 
  it 
  also 
  on 
  pines 
  on 
  the 
  campus 
  of 
  Cornell 
  University, 
  Ithaca, 
  N. 
  Y." 
  

  

  At 
  about 
  the 
  same 
  time 
  that 
  Professor 
  Johnson 
  reported 
  its 
  presence 
  at 
  these 
  places 
  I 
  ob- 
  

   served 
  several 
  trees 
  near 
  Ticona, 
  111. 
  (La 
  Salle 
  Co.) 
  which 
  were 
  badly 
  infested, 
  and 
  noticed 
  

   signs 
  of 
  its 
  presence 
  in 
  Putnam 
  Co., 
  nine 
  miles 
  southwest 
  of 
  Ticona. 
  

  

  