﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  567 
  

  

  metathorax 
  and 
  the 
  first 
  seven 
  segments 
  of 
  the 
  abdomen. 
  Two 
  stalks 
  

   occur 
  together 
  on 
  each 
  side 
  of 
  the 
  segment, 
  and 
  these 
  are 
  in 
  turn 
  divided 
  

   into 
  six 
  or 
  nine 
  filaments. 
  Instead 
  of 
  four 
  stalks 
  the 
  mesothorax 
  has 
  two, 
  

   the 
  metathorax 
  three 
  and 
  the 
  seventh 
  abdominal 
  segment 
  one. 
  Two 
  

   brown 
  spots 
  are 
  very 
  prominent 
  on 
  the 
  ventral 
  side 
  of 
  the 
  eighth 
  and 
  of 
  

   the 
  ninth 
  segments. 
  The 
  anal 
  hooks 
  are 
  on 
  very 
  large 
  prblegs 
  of 
  one 
  

   joint 
  each, 
  A 
  bunch 
  of 
  hairs 
  is 
  at 
  the 
  base 
  of 
  each 
  hook. 
  One 
  or 
  two 
  

   stout 
  hairs 
  arise 
  near 
  the 
  base 
  of 
  the 
  hook 
  and 
  extend 
  to 
  meet 
  its 
  point. 
  

   Pupa. 
  Length 
  ii 
  mm. 
  Width 
  2 
  mm. 
  Head 
  pinkish. 
  Thorax 
  

   white. 
  Spurs 
  on 
  the 
  tibiae 
  arranged 
  in 
  the 
  order 
  1-4-4. 
  Abdomen 
  

   white 
  with 
  brick 
  red 
  on 
  the 
  dorsal 
  side. 
  Hooks 
  pointing 
  backward 
  are 
  

   on 
  the 
  third, 
  fourth, 
  fifth, 
  sixth, 
  seventh 
  and 
  eighth 
  segments. 
  Plates 
  

   with 
  spurs 
  pointing 
  forward 
  are 
  on 
  the 
  third 
  and 
  fourth 
  segments. 
  I 
  was 
  

   able 
  to 
  make 
  out 
  but 
  eight 
  abdominal 
  segments 
  in 
  this 
  pupa. 
  

  

  I 
  Halesus 
  species? 
  

  

  Plate 
  32, 
  figures 
  3, 
  6; 
  plate 
  33, 
  figure 
  3 
  

  

  Habitat. 
  Larvae 
  and 
  pupae 
  were 
  found 
  in 
  Little 
  Clear 
  creek 
  and 
  

   along 
  the 
  shore 
  of 
  Little 
  Clear 
  lake, 
  specially 
  on 
  wood 
  strewn 
  bottoms. 
  

  

  Occurrence. 
  Larvae 
  were 
  quite 
  plentiful 
  during 
  the 
  entire 
  period. 
  

   Pupae 
  were 
  obtained 
  only 
  at 
  the 
  last. 
  Only 
  two 
  or 
  three 
  adults 
  were 
  

   seen 
  and 
  those 
  during 
  the 
  last 
  week 
  of 
  work. 
  A 
  single 
  specimen 
  of 
  this 
  

   species 
  was 
  bred 
  Aug. 
  31, 
  1900. 
  

  

  Case. 
  (PI. 
  33, 
  fig. 
  3) 
  Case 
  of 
  thin 
  pieces 
  of 
  wood 
  placed 
  at 
  right 
  

   angles 
  to 
  the 
  length 
  of 
  the 
  case 
  with 
  their 
  ends 
  crossed. 
  The 
  coarseness 
  

   of 
  the 
  material 
  used 
  varies 
  but 
  is 
  uniform 
  

   for 
  each 
  case. 
  Length 
  18 
  to 
  20 
  mm. 
  

   Width 
  7 
  mm. 
  

  

  Larva. 
  (PI. 
  32, 
  fig. 
  3) 
  Length 
  15 
  mm. 
  

   Width 
  4 
  Dr 
  5 
  mm. 
  Head 
  brownish 
  black 
  

   with 
  broad 
  white 
  stripes 
  running 
  obliquely 
  

   from 
  the 
  corners 
  of 
  the 
  mouth 
  along 
  both 
  

   dorsal 
  and 
  ventral 
  sides 
  of 
  the 
  eyes. 
  There 
  

   is 
  a 
  white 
  spot 
  where 
  the 
  inner 
  pair 
  of 
  stripes 
  

  

  ^ 
  ^ 
  Fig. 
  37 
  Dorsal 
  view 
  of 
  end 
  of 
  abdo- 
  

  

  would 
  unite 
  if 
  continued. 
  The 
  anterior 
  half 
  "^^^ 
  ^^ 
  ^^^^^ 
  

   of 
  the 
  dorsal 
  side 
  of 
  the 
  prothorax 
  is 
  black, 
  the 
  posterior 
  half 
  white. 
  

   The 
  mesothoracic 
  shield 
  blackish 
  brown 
  bordered 
  with 
  black. 
  Meta- 
  

   thorax 
  yellow 
  with 
  large 
  brown 
  spots. 
  Legs 
  yellow 
  with 
  triangular 
  white 
  

   spot 
  on 
  the 
  outside 
  of 
  each 
  femur 
  at 
  its 
  joint 
  with 
  the 
  tibia. 
  Two 
  spurs 
  

   on 
  each 
  tibia. 
  Abdomen 
  purplish, 
  whiter 
  beneath. 
  Anal 
  hooks 
  are 
  on 
  

  

  