﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  4OI 
  

  

  coarsest 
  of 
  which 
  had 
  a 
  mesh 
  of 
  about 
  2.5 
  mm 
  square 
  (10 
  meshes 
  to 
  

   the 
  inch). 
  The 
  method 
  was 
  the 
  same 
  for 
  both 
  : 
  the 
  plot 
  was 
  staked 
  

   out; 
  the 
  vegetation 
  was 
  swept 
  with 
  an 
  air 
  net 
  down 
  to 
  the 
  water 
  line 
  for 
  

   its 
  aerial 
  forms 
  of 
  life 
  ; 
  it 
  was 
  swept 
  again 
  with 
  a 
  water 
  net 
  for 
  its 
  aquatic 
  

   population; 
  it 
  was 
  then 
  pulled 
  up 
  by 
  the 
  roots 
  and 
  piled 
  in 
  pails 
  and 
  

   examined 
  a 
  handful 
  at 
  a 
  time 
  in 
  a 
  bowl 
  of 
  clean 
  water, 
  having 
  all 
  the 
  

   animal 
  Hfe 
  separated 
  from 
  it; 
  the 
  soil 
  of 
  the 
  bottom 
  was 
  then 
  scraped 
  

   up 
  and 
  sifted 
  for 
  a 
  depth 
  of 
  two 
  or 
  three 
  inches. 
  The 
  material 
  was 
  very 
  

   quickly 
  gathered 
  up 
  from 
  the 
  plot 
  selected, 
  but 
  the 
  separation 
  of 
  the 
  

   animal 
  hfe 
  from 
  the 
  plants 
  and 
  debris 
  was 
  a 
  whole 
  day's 
  work 
  for 
  two 
  

   or 
  three 
  persons, 
  to 
  say 
  nothing 
  of 
  the 
  time 
  necessary 
  for 
  studying 
  the 
  

   animals 
  later. 
  These 
  studies, 
  though 
  time-consuming, 
  always 
  yielded 
  

   the 
  information 
  sought 
  as 
  to 
  the 
  relative 
  numbers 
  of 
  the 
  several 
  species 
  

   present, 
  and 
  were 
  profitable, 
  also, 
  in 
  quite 
  another 
  way. 
  The 
  careful 
  

   examination 
  of 
  the 
  situation 
  which 
  they 
  necessitated 
  always 
  revealed 
  the 
  

   presence 
  of 
  a 
  number 
  of 
  species 
  not 
  found 
  by 
  more 
  superficial 
  collecting 
  

   methods, 
  and 
  these 
  were 
  not 
  always 
  the 
  smaller 
  species. 
  

  

  First 
  plot. 
  This 
  was 
  in 
  the 
  creek 
  just 
  below 
  the 
  hatchery. 
  The 
  site 
  

   is 
  shown 
  in 
  plates 
  4 
  and 
  5. 
  The 
  plot 
  extended 
  from 
  the 
  edge 
  of 
  the 
  

   current 
  in 
  open 
  water 
  12 
  to 
  15 
  inches 
  in 
  depth, 
  to 
  the 
  bank, 
  a 
  distance 
  

   of 
  about 
  5 
  feet, 
  and 
  a 
  strip 
  3 
  feet 
  wide 
  was 
  selected. 
  Two 
  views 
  of 
  it 
  

   from 
  opposite 
  sides 
  are 
  given 
  in 
  the 
  plates, 
  and 
  its 
  exact 
  site 
  is 
  indicated 
  

   by 
  the 
  position 
  of 
  the 
  sieve 
  net 
  in 
  plate 
  4, 
  and 
  is 
  occupied 
  by 
  the 
  cage 
  

   in 
  the 
  foreground 
  in 
  plate 
  5. 
  The 
  collections 
  were 
  made 
  July 
  10. 
  The 
  

   ^water 
  was 
  about 
  3 
  inches 
  deep 
  at 
  the 
  bank, 
  and 
  descended 
  somewhat 
  

   regularly 
  toward 
  the 
  current 
  side. 
  Over 
  nearly 
  the 
  whole 
  of 
  the 
  area 
  

   there 
  was 
  an 
  abundant 
  growth 
  of 
  aquatics, 
  most 
  abundant 
  among 
  which 
  

   was 
  a 
  species 
  of 
  matted, 
  submerged 
  Potamogeton, 
  intermixed 
  

   with 
  a 
  variety 
  of 
  filamentous 
  algae, 
  and 
  a 
  httle 
  Nitella. 
  The 
  plants 
  

   which 
  appeared 
  above 
  the 
  water 
  were 
  water-cress, 
  water-speedwell, 
  and 
  

   a 
  thin 
  grass 
  which 
  I 
  took 
  to 
  be 
  a 
  species 
  of 
  Leersia. 
  There 
  was 
  

   no 
  bur 
  reed 
  growing 
  in 
  this 
  plot. 
  

  

  The 
  following 
  animals 
  were 
  taken 
  from 
  this 
  plot. 
  

  

  Vertebrates 
  

  

  I 
  full-grown 
  bullfrog, 
  Rana 
  Catesbiana 
  Shaw, 
  whose 
  stomach 
  

   contained: 
  7 
  full 
  grown 
  snails, 
  Physa 
  heterostropha 
  Say; 
  i 
  

   dragon 
  fly, 
  $ 
  Calopteryx 
  maculata 
  Beauv.; 
  i 
  Crane 
  fly 
  (unde- 
  

   termined); 
  I 
  Scarabaeid 
  beetle; 
  1 
  female 
  winged 
  carpenter 
  ant; 
  i 
  Syrphus 
  

   fly 
  (apparendy 
  one 
  of 
  the 
  smaller 
  members 
  of 
  the 
  genus 
  Syrphus); 
  i 
  

  

  