﻿362 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  leaves 
  of 
  cottonwood, 
  Populus 
  monilifera^ 
  in 
  Washington 
  park, 
  Albany, 
  

   N. 
  Y. 
  The 
  petioles 
  of 
  many 
  of 
  the 
  fallen 
  leaves 
  from 
  these 
  trees 
  last 
  

   year 
  (1896) 
  showed 
  the 
  peculiar 
  galls 
  of 
  this 
  insect 
  with 
  its 
  nearly 
  trans- 
  

   verse 
  opening 
  for 
  the 
  escape 
  of 
  the 
  winged 
  plant 
  lice. 
  Dmring 
  the 
  autumn 
  

   of 
  the 
  present 
  year 
  the 
  galls 
  of 
  this 
  species 
  were 
  nearly 
  as 
  abundant 
  as 
  in 
  

   the 
  preceding 
  season. 
  

  

  Chaitophorus 
  species. 
  A 
  plant 
  louse 
  belonging 
  to 
  this 
  genus, 
  was 
  

   generally 
  present 
  in 
  numbers 
  on 
  the 
  under 
  surface 
  of 
  the 
  leaves 
  of 
  the 
  

   Norway 
  maple, 
  Acer 
  platanoides, 
  throughout 
  this 
  city, 
  and 
  was 
  also 
  

   reported 
  from 
  a 
  number 
  of 
  other 
  localities 
  within 
  the 
  state. 
  Several 
  

   winged 
  and 
  a 
  number 
  of 
  wingless 
  viviparous 
  females 
  were 
  found 
  on 
  a 
  

   leaf 
  — 
  the 
  latter 
  commonly 
  surrounded 
  by 
  a 
  numerous 
  progeny 
  — 
  the 
  

   winged 
  individuals 
  being, 
  probably, 
  the 
  primary 
  parents 
  of 
  the 
  colony. 
  

   The 
  groups 
  of 
  young 
  were 
  usually 
  clustered 
  along 
  the 
  veins 
  of 
  the 
  leaf, 
  

   specially 
  of 
  those 
  at 
  the 
  base 
  ; 
  occasionally 
  groups 
  would 
  be 
  found 
  almost 
  

   midway 
  between 
  two 
  veins. 
  A 
  large 
  amount 
  of 
  honeydew 
  was 
  excreted, 
  

   which, 
  when 
  dripping 
  upon 
  the 
  flagging 
  beneath, 
  would 
  indicate 
  the 
  

   presence 
  of 
  the 
  insects 
  above. 
  The 
  honeydew 
  was 
  quite 
  viscid, 
  and 
  

   when 
  falling 
  upon 
  leaves 
  underneath 
  frequently 
  dried 
  in 
  hard 
  clear 
  beads 
  

   of 
  considerable 
  size. 
  This 
  severe 
  drain 
  upon 
  the 
  tree 
  continued 
  for 
  

   several 
  weeks, 
  till 
  arrested 
  by 
  the 
  multiplication 
  of 
  the 
  natural 
  enemies 
  

   of 
  this 
  aphid. 
  One 
  of 
  the 
  most 
  active 
  was 
  the 
  common 
  ladybug, 
  Adalia 
  

   bipuncfata, 
  the 
  larvae 
  and 
  pupae 
  of 
  which 
  were 
  abundant 
  on 
  infested 
  

   trees. 
  A 
  larger 
  species, 
  Anatis 
  ocellata, 
  was 
  associated 
  with 
  it. 
  Syrphid 
  

   larvae 
  and 
  the 
  young 
  of 
  lace-wing 
  flies, 
  also 
  preyed 
  on 
  this 
  species. 
  

  

  Examples 
  of 
  this 
  insect 
  were 
  submitted 
  to 
  the 
  division 
  of 
  entomology 
  

   at 
  Washington, 
  but 
  they 
  could 
  not 
  be 
  referred 
  to 
  any 
  described 
  species^ 
  

   Dr 
  Howard 
  had 
  received 
  it 
  during 
  the 
  past 
  season 
  from 
  many 
  localities 
  

   in 
  New 
  England, 
  where 
  it 
  had 
  been 
  reported 
  so 
  injurious 
  as 
  to 
  occa- 
  

   sion 
  the 
  fall 
  of 
  many 
  of 
  the 
  infested 
  leaves. 
  

  

  Callipterus 
  ulmifolii 
  Monell. 
  This 
  delicate 
  species 
  was 
  unusually 
  

   abundant 
  on 
  the 
  under 
  surface 
  of 
  the 
  foliage 
  of 
  American 
  elms. 
  The 
  

   honey-dew 
  produced 
  by 
  these 
  species 
  covered 
  the 
  sidewalk 
  beneath, 
  and 
  

   the 
  surface 
  of 
  the 
  leaves 
  upon 
  which 
  it 
  fell. 
  This 
  severe 
  attack 
  continued 
  

   through 
  July 
  and 
  during 
  the 
  greater 
  part 
  of 
  August, 
  when 
  it 
  was 
  finally 
  

   arrested 
  by 
  heavy 
  rains, 
  together 
  with 
  the 
  aid 
  of 
  numerous 
  coccinellid 
  

   larvae. 
  Numbers 
  of 
  these, 
  actively 
  engaged 
  in 
  their 
  beneficial 
  work, 
  

   could 
  be 
  seen 
  upon 
  the 
  lower 
  limbs. 
  Of 
  a 
  number 
  of 
  the 
  larvae 
  picked 
  

   up 
  near 
  the 
  base 
  of 
  a 
  small 
  tree, 
  nearly 
  all 
  were 
  identified 
  as 
  Adalia 
  

   bipunctata. 
  

  

  