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  latory 
  organ, 
  it 
  must 
  operate 
  during 
  the 
  nocturnal 
  flights 
  that 
  

   these 
  bugs 
  frequently 
  take, 
  as 
  it 
  seemed 
  impossible 
  that 
  it 
  could 
  

   operate 
  under 
  water. 
  This 
  organ 
  also 
  occurs 
  only 
  in 
  the 
  males, 
  

   and 
  not 
  in 
  all 
  the 
  species." 
  

  

  The 
  remarks 
  were 
  illustrated 
  by 
  two 
  microscope 
  slides 
  and 
  by 
  

   figures 
  of 
  the 
  only 
  Hawaiian 
  Corixid, 
  Arctocorisa 
  blackhurni 
  (F. 
  

   B. 
  White) 
  which 
  has 
  so 
  far 
  only 
  been 
  found 
  in 
  these 
  Islands, 
  al- 
  

   though 
  it 
  belongs 
  to 
  a 
  Central 
  American 
  and 
  Antillean 
  group 
  

   characterized 
  by 
  the 
  shape 
  of 
  the 
  anterior 
  tibiae 
  in 
  the 
  males. 
  

  

  Mr. 
  O. 
  H. 
  SwEzEY 
  then 
  read 
  his 
  "Observations 
  on 
  Insects 
  Dur- 
  

   ing 
  a 
  Recent 
  Trip 
  on 
  Hara'aii," 
  illustrated 
  by 
  numerous 
  specimens: 
  

  

  HYMENOPTERA 
  

  

  Sceliphron 
  caenientariuni: 
  No 
  adults 
  were 
  seen, 
  but 
  the 
  nests 
  of 
  

   this 
  mud-dauber 
  wasp 
  were 
  common, 
  and 
  they 
  always 
  con- 
  

   tained 
  larvae 
  or 
  pupae, 
  which 
  shows 
  that 
  this 
  species 
  is 
  con- 
  

   tinuing 
  the 
  habit 
  of 
  hibernation 
  which 
  it 
  had 
  in 
  the 
  States, 
  

   where 
  it 
  hibernates 
  as 
  larvae 
  in 
  the 
  cells 
  of 
  its 
  mud-nest. 
  

  

  Odynerns 
  nigripennis: 
  Very 
  abundant. 
  They 
  gather 
  the 
  larvae 
  

   of 
  Hynienia. 
  recurvaiis 
  and 
  other 
  green 
  caterpillars 
  to 
  store 
  

   up 
  for 
  food 
  for 
  their 
  young. 
  Many 
  other 
  species 
  of 
  Odynerns 
  

   are 
  abundant. 
  

  

  Polistes 
  anrifer 
  and 
  another 
  species 
  are 
  everywhere 
  in 
  cane 
  fields, 
  

   feeding 
  upon 
  the 
  "honey 
  dew" 
  deposited 
  upon 
  the 
  cane 
  leaves 
  

   by 
  the 
  leaf-hoppers. 
  

  

  Xylocopa 
  hrasilianornm 
  : 
  This 
  large 
  carpenter 
  bee 
  is 
  abundant 
  

   and 
  does 
  considerable 
  damage 
  to 
  fence 
  and 
  telephone 
  posts 
  

   and 
  some 
  buildings, 
  especially 
  such 
  as 
  are 
  made 
  of 
  redwood 
  

   lumber. 
  

  

  Ants: 
  Swarms 
  of 
  them 
  in 
  cane 
  fields, 
  and 
  they 
  must 
  consume 
  a 
  

   great 
  many 
  of 
  the 
  young 
  leaf-hoppers. 
  

  

  EcthrodelpJuix 
  fairchildii: 
  This 
  leaf-hopper 
  parasite 
  was 
  seen 
  

   only 
  in 
  the 
  plantations 
  of 
  Kau, 
  one 
  plantation 
  of 
  Kohala, 
  

   and 
  at 
  Puako. 
  Numerous 
  attempts 
  have 
  been 
  made 
  to 
  intro- 
  

   duce 
  it 
  in 
  the 
  plantations 
  of 
  the 
  Hilo 
  and 
  Hamakua 
  Districts, 
  

   but 
  it 
  apparently 
  has 
  failed 
  to 
  become 
  established. 
  

  

  Chalcis 
  obscnrata, 
  

  

  Pimpl-a 
  Iiazcaiiensis, 
  

  

  Eclithromorplia 
  maeulipennis, 
  and 
  

  

  