﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  4^5 
  

  

  17 
  Polycentropus 
  lucidus 
  Hagen 
  

   8 
  Hales 
  us 
  no. 
  i 
  (see 
  ip. 
  567) 
  

   10 
  Hales 
  us 
  no, 
  2 
  (seep. 
  k,6S) 
  

  

  16 
  Hales 
  us 
  no. 
  3 
  (seep. 
  569) 
  

  

  17 
  unclassified 
  

  

  260 
  BEETLES 
  

  

  Donacia 
  emarginata 
  Kirby, 
  of 
  which 
  two 
  were 
  adults, 
  152 
  

   were 
  inclosed 
  in 
  puparia 
  attached 
  to 
  the 
  bur 
  reed 
  roots, 
  and 
  a 
  few 
  

   were 
  free 
  larvae. 
  Since 
  several 
  species 
  occurred 
  about 
  the 
  creek, 
  it 
  is 
  by 
  

   no 
  means 
  certain 
  that 
  all 
  these 
  belonged 
  to 
  the 
  single 
  species 
  named. 
  

  

  25 
  DRAGON 
  FLY 
  NYMPHS 
  

  

  2 
  Cordulegaster 
  maculatus 
  Selys 
  

   4Aeschna 
  constricta 
  Say 
  

  

  4 
  G 
  o 
  m 
  p 
  h 
  u 
  s 
  e 
  X 
  i 
  1 
  i 
  s 
  Selys 
  

  

  5 
  Ophiogomphus 
  aspersus 
  Morse 
  

   5Argia 
  violacea 
  Hagen 
  

  

  5 
  Sympetrum 
  assimilatum 
  Uhler. 
  Of 
  this 
  species 
  7 
  addi- 
  

   tional 
  specimens 
  were 
  picked 
  from 
  the 
  stems 
  above 
  the 
  water 
  in 
  trans- 
  

   formation; 
  but 
  one 
  other 
  insect 
  specimen 
  (a 
  stone 
  fly, 
  Leuctra 
  

   t 
  e 
  n 
  e 
  1 
  1 
  a) 
  was 
  found 
  above 
  the 
  water. 
  

  

  10 
  MAY 
  FLY 
  NYMPHS 
  

  

  1 
  Ephemera 
  varia 
  Etn. 
  

  

  4 
  Ephemerella 
  excrucians 
  Walsh 
  

  

  5 
  Baetis 
  pygmaea 
  Hagen 
  

  

  8 
  DIPTEROUS 
  LARVAE 
  AND 
  PUPAE 
  

  

  2 
  small 
  crane 
  fly 
  larvae 
  (undetermined 
  Tipulidae) 
  

   4 
  horsefly 
  larvae 
  (undetermined 
  Tabanidae) 
  

  

  2 
  mosquito 
  pupae 
  (undetermined) 
  

  

  Comparing 
  now 
  the 
  lists 
  made 
  from 
  the 
  two 
  plots 
  we 
  observe 
  some 
  

   striking 
  differences. 
  Those 
  that 
  appear 
  in 
  the 
  number 
  and 
  variety 
  of 
  

   aerial 
  forms 
  taken 
  in 
  the 
  first 
  plot, 
  and 
  the 
  paucity 
  of 
  them 
  in 
  the 
  second, 
  

   may 
  be 
  due 
  mainly 
  to 
  weather 
  conditions 
  : 
  the 
  first 
  plot 
  was 
  worked 
  on 
  a 
  

   dry, 
  sunshiny 
  morning; 
  the 
  second, 
  on 
  a 
  partly 
  cloudy 
  morning 
  after 
  rain. 
  

   The 
  plots 
  agree 
  in 
  that 
  their 
  miscellaneous 
  plant 
  feeders 
  were 
  mainly 
  

   moUusks 
  and 
  caddis 
  flies. 
  Mollusks 
  seem 
  to 
  constitute 
  a 
  larger 
  bulk 
  

   than 
  any 
  other 
  single 
  group. 
  Snails 
  were 
  found 
  in 
  the 
  stomachs 
  of 
  frog 
  

   and 
  fish, 
  and 
  are 
  known 
  to 
  be 
  the 
  food 
  of 
  horsefly 
  larvae 
  (Tabanidae). 
  

   There 
  are 
  certainly 
  snails 
  enough 
  in 
  the 
  creek 
  to 
  justify 
  the 
  extraordinary 
  

   abundance 
  of 
  horseflies 
  in 
  this 
  vicinity. 
  

  

  