﻿20 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  our 
  attention 
  last 
  July, 
  by 
  the 
  reception 
  of 
  a 
  number 
  of 
  gladioli 
  

   bulbs 
  badly 
  infested 
  with 
  plant 
  lice, 
  although 
  they 
  had 
  been 
  pre- 
  

   viously 
  fumigated 
  with 
  sulfur. 
  The 
  insect 
  must 
  be 
  exceedingly 
  

   prolific, 
  since 
  one 
  small 
  box 
  containing 
  about 
  a 
  dozen 
  bulbs 
  had 
  the 
  

   interstices 
  almost 
  filled 
  with 
  exuviae 
  and 
  plant 
  lice. 
  The 
  presence 
  

   of 
  large 
  numbers 
  of 
  these 
  insects 
  injures 
  the 
  salabiHty 
  of 
  the 
  

   bulbs, 
  since 
  it 
  weakens 
  them 
  materially 
  and 
  frequently 
  results 
  in 
  

   a 
  failure 
  to 
  bloom. 
  This 
  species 
  has 
  caused 
  more 
  or 
  less 
  trouble 
  

   to 
  some 
  of 
  our 
  growers 
  for 
  the 
  past 
  two 
  or 
  three 
  years, 
  particularly 
  

   in 
  late 
  winter. 
  Examples 
  of 
  this 
  plant 
  louse 
  were 
  submitted 
  to 
  

   Mr 
  Pergande, 
  through 
  Dr 
  L. 
  O. 
  Howard, 
  and 
  by 
  him 
  pronounced 
  

   to 
  be 
  an 
  unknown 
  species 
  of 
  aphis. 
  

  

  Description. 
  The 
  very 
  young 
  plant 
  louse 
  is 
  about 
  .75 
  mm 
  long, 
  

   pale 
  yellowish 
  or 
  whitish 
  transparent 
  with 
  an 
  obscure 
  subapical 
  

   orange 
  band 
  on 
  the 
  abdomen. 
  The 
  antennae 
  are 
  slightly 
  fuscous 
  

   apically, 
  the 
  tip 
  of 
  the 
  beak, 
  the 
  distal 
  tarsal 
  segments 
  and 
  the 
  cor- 
  

   nicles 
  being 
  fuscous; 
  the 
  eyes 
  are 
  black. 
  The 
  antennal 
  segments 
  

   in 
  this 
  stage 
  have 
  the 
  following 
  measurements: 
  Third 
  .21 
  mm, 
  

   fourth 
  .06 
  mm, 
  fifth 
  .141 
  mm. 
  The 
  cornicles 
  are 
  subcylindric. 
  

   being 
  .09 
  x 
  .045 
  mm. 
  

  

  The 
  partly 
  full 
  grown 
  wingless 
  female 
  has 
  the 
  following 
  anten- 
  

   nal 
  measurements. 
  Third 
  segment 
  .195 
  

   mm, 
  fourth 
  .12 
  mm, 
  fifth 
  .085 
  mm, 
  the 
  

   sixth 
  .415 
  mm, 
  the 
  cornicles 
  being 
  sub- 
  

   cylindric, 
  .135 
  X 
  .06 
  mm. 
  

  

  The 
  full 
  grown 
  wingless 
  female 
  is 
  rather 
  

   stout, 
  a 
  pale 
  yellowish 
  white, 
  the 
  head 
  

   dorsally, 
  frequently 
  having 
  a 
  distinct 
  yel- 
  

   lowish 
  cast 
  and 
  the 
  subapical 
  abdominal 
  

   segments 
  a 
  deeper 
  yellowish 
  cast 
  on 
  the 
  

  

  Fig. 
  6 
  Gladioli 
  aphid, 
  postc" 
  ^ 
  rj^. 
  r 
  .^ 
  J.^ 
  • 
  a 
  r 
  .^ 
  i 
  

  

  rior 
  extremity 
  of 
  wingless 
  fe- 
  VeutCr. 
  i 
  llC 
  apCX 
  Of 
  the 
  third, 
  fOUrth 
  aUQ 
  

   male, 
  enlarged. 
  (Original) 
  r 
  rj_i 
  j_ 
  i 
  i 
  i 
  j_i 
  r 
  

  

  fifth 
  antennal 
  segments 
  and 
  the 
  apexes 
  of 
  

   the 
  tibiae, 
  tarsi 
  and 
  the 
  beak 
  are 
  fuscous. 
  The 
  cornicles 
  are 
  light 
  

   fuscous 
  and 
  the 
  eyes 
  black. 
  

  

  Winged 
  female. 
  Length 
  1.75 
  mm. 
  This 
  form 
  is 
  dark 
  brown 
  

   and 
  yellowish, 
  the 
  antennae 
  being 
  mostly 
  a 
  fuscous 
  yellowish, 
  the 
  

   head 
  fuscous, 
  the 
  pronotal 
  lobes 
  a 
  variable 
  fuscous 
  and 
  separated 
  

   from 
  the 
  mesonotum 
  by 
  a 
  yellowish 
  or 
  deep 
  orange 
  area. 
  The 
  

   thorax 
  has 
  the 
  median 
  and 
  two 
  conspicuous 
  submedian 
  lobes 
  

   fuscous. 
  Scutellum 
  fuscous, 
  postscutellum 
  light 
  fuscous. 
  Abdo- 
  

   men 
  a 
  variable 
  yellowish 
  orange 
  and 
  with 
  a 
  variable, 
  oval, 
  or 
  sub- 
  

  

  