﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  409 
  

  

  to 
  come 
  into 
  the 
  hatchery 
  was 
  the 
  fly, 
  R 
  o 
  e 
  deri 
  o 
  d 
  es 
  juncta. 
  In 
  

   addition 
  to 
  these 
  forms, 
  and 
  the 
  green 
  stone 
  fly, 
  C 
  h 
  1 
  o 
  r 
  o 
  p 
  e 
  r 
  1 
  a 
  b 
  i- 
  

   1 
  i 
  n 
  e 
  a 
  t 
  a 
  Say, 
  which 
  doubtless 
  belongs 
  with 
  them 
  in 
  its 
  season, 
  there 
  

   occurred 
  in 
  the 
  hatchery 
  a 
  large 
  number 
  of 
  Diptera 
  of 
  various 
  sorts, 
  and 
  

   the 
  spongilla 
  flies, 
  hitherto 
  accounted 
  so 
  rare. 
  Fresh-water 
  sponges 
  

   from 
  the 
  lake 
  above 
  invade 
  the 
  pipes, 
  and 
  the 
  larvae 
  of 
  these 
  flies 
  come 
  

   in 
  with 
  the 
  sponges 
  on 
  which 
  they 
  live. 
  

  

  On 
  June 
  19 
  we 
  collected 
  the 
  contents 
  of 
  one 
  of 
  the 
  supply 
  troughs 
  in 
  

   the 
  hatchery. 
  It 
  contained 
  more 
  than 
  125 
  little 
  fresh 
  -water 
  sponges, 
  

   averaging 
  the 
  size 
  of 
  peas, 
  from 
  which 
  were 
  picked 
  seven 
  spongilla 
  fly 
  

   larvae, 
  nine 
  amphipods 
  (undetermined), 
  one 
  entomostracan, 
  Epis- 
  

   chura 
  lacustris 
  Forbes, 
  about 
  a 
  dozen 
  each 
  of 
  two 
  species 
  of 
  May 
  

   flies, 
  Heptagenia 
  pulcheUa 
  Walsh 
  and 
  EphemereUa 
  ex- 
  

   crucians 
  Walsh, 
  a 
  large 
  number 
  of 
  black 
  fly 
  larvae, 
  a 
  few 
  H 
  y 
  d 
  r 
  o 
  p- 
  

   s 
  y 
  c 
  h 
  e 
  larvae, 
  a 
  few 
  gnat 
  larvae 
  and 
  a 
  number 
  of 
  colonies 
  of 
  rotifers. 
  

  

  Some 
  of 
  the 
  multitudinous 
  gnats 
  in 
  the 
  windows 
  were 
  of 
  the 
  same 
  

   species 
  that 
  I 
  bred 
  from 
  larvae 
  taken 
  from 
  " 
  skin 
  algae 
  " 
  scraped 
  from 
  

   the 
  races 
  outside. 
  Horseflies 
  (Tabanidae) 
  were 
  also 
  conspicuous 
  occu- 
  

   pants 
  of 
  the 
  windows, 
  but 
  I 
  did 
  not 
  find 
  their 
  immature 
  stages 
  in 
  the 
  

   hatchery. 
  Possibly 
  these 
  may 
  have 
  come 
  in 
  through 
  open 
  doors 
  and 
  

   windows, 
  being 
  so 
  active 
  and 
  so 
  abundant 
  outside. 
  The 
  handsome 
  

   longicorn 
  beetle, 
  Leptura 
  canadensis 
  Fabr., 
  which 
  was 
  not 
  

   uncommon 
  in 
  the 
  windows 
  during 
  the 
  latter 
  half 
  of 
  the 
  session, 
  certainly 
  

   entered 
  in 
  this 
  way. 
  

  

  A 
  small 
  number 
  of 
  specimens 
  representing 
  a 
  new 
  genus 
  and 
  species 
  of 
  

   Stratiomyiidae 
  (described 
  in 
  part 
  3, 
  p. 
  585 
  asZabrachia 
  polita 
  Coq.) 
  

   were 
  picked 
  from 
  the 
  hatchery 
  ceiling, 
  while 
  gathering 
  spongilla 
  flies. 
  

  

  Red 
  hydras 
  were 
  exceedingly 
  abundant 
  in 
  Little 
  Clear 
  creek 
  during 
  

   the 
  first 
  half 
  of 
  our 
  session, 
  insomuch 
  that 
  they 
  fairly 
  covered 
  every 
  

   trailing 
  stem 
  and 
  leaf 
  in 
  the 
  current, 
  and 
  occupied 
  every 
  available 
  sup- 
  

   port, 
  even 
  to 
  the 
  backs 
  of 
  the 
  dragon 
  fly 
  and 
  May 
  fly 
  nymphs, 
  one 
  of 
  which 
  

   would 
  often 
  bear 
  half 
  a 
  dozen 
  or 
  more 
  of 
  them. 
  Then 
  they 
  gradually 
  

   disappeared, 
  till 
  in 
  August 
  hardly 
  a 
  hydra 
  was 
  to 
  be 
  found. 
  A 
  single 
  

   blade 
  of 
  Sparganium 
  brought 
  in 
  in 
  June 
  for 
  some 
  eggs 
  ofBasiaeschna 
  

   Janata 
  which 
  had 
  been 
  laid 
  in 
  it, 
  bore 
  hundreds 
  of 
  hydras 
  profusely 
  

   budding, 
  and 
  all 
  of 
  a 
  very 
  distinct 
  red 
  color. 
  An 
  observant 
  employee 
  

   of 
  the 
  hatchery, 
  Milo 
  Otis, 
  who 
  attends 
  to 
  feeding 
  the 
  fry, 
  informed 
  me 
  that 
  

   at 
  certain 
  times 
  the 
  water 
  flowing 
  through 
  the 
  ponds 
  is 
  tinged 
  with 
  red 
  

   from 
  the 
  hydras 
  floating 
  in 
  it,- 
  and 
  that 
  at 
  such 
  times 
  the 
  young 
  trout 
  sub- 
  

   sist 
  on 
  these, 
  and 
  refuse 
  to 
  eat 
  other 
  food. 
  It 
  would 
  be 
  interesting 
  to 
  

  

  