﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  45/ 
  

  

  from 
  this 
  state. 
  It 
  was 
  common 
  at 
  Saranac 
  Inn, 
  and 
  even 
  more 
  common, 
  

   judging 
  by 
  the 
  numbers 
  of 
  exuviae 
  in 
  evidence 
  along 
  the 
  bank, 
  at 
  Axton 
  

   along 
  Stony 
  brook. 
  But 
  few 
  images 
  were 
  seen 
  at 
  large, 
  but 
  many 
  were 
  

   bred 
  from 
  nymphs 
  taken 
  from 
  Little 
  Clear 
  creek 
  beside 
  .the 
  hatchery. 
  

  

  This 
  species, 
  unlike 
  most 
  Odonata, 
  seems 
  to 
  prefer 
  dayUght, 
  and 
  even 
  

   midday 
  as 
  a 
  time 
  for 
  transformation. 
  The 
  boarded 
  banks 
  of 
  the 
  im- 
  

   pounded 
  creek 
  beside 
  the 
  hatchery 
  were 
  watched 
  through 
  the 
  entire 
  

   season, 
  and 
  each 
  day 
  the 
  exuviae 
  left 
  there 
  were 
  gathered, 
  , 
  Rarely 
  were 
  

   any 
  fresh 
  skins 
  found 
  there 
  early 
  in 
  the 
  morning. 
  July 
  was 
  so 
  rainy 
  there 
  

   was 
  comparatively 
  little 
  time 
  suitable 
  for 
  transformation; 
  and, 
  when 
  the 
  

   clouds 
  would 
  break 
  away 
  about 
  noon 
  and 
  the 
  sun 
  shine 
  out, 
  I 
  could 
  be 
  

   sure, 
  on 
  going 
  out, 
  to 
  find 
  some 
  nymphs 
  in 
  transformation. 
  On 
  the 
  {qw 
  

   clear 
  days, 
  this 
  was 
  most 
  often 
  observed 
  about 
  noon. 
  All 
  the 
  skins 
  

   observed 
  were 
  left 
  3-30 
  inches 
  above 
  the 
  surface 
  of 
  the 
  water. 
  The 
  

   nymphs 
  are 
  rather 
  slow 
  and 
  sprawling. 
  The 
  imagos 
  seem 
  to 
  spend 
  

   little 
  time 
  in 
  flight, 
  preferring 
  to 
  rest 
  on 
  timbers 
  about 
  the 
  rapids 
  of 
  the 
  

   stream. 
  

  

  Nymph. 
  (PI. 
  18, 
  fig. 
  2) 
  Measures 
  in 
  total 
  length 
  42 
  mm 
  ; 
  abdomen 
  

   28 
  mm; 
  hind 
  femur 
  5 
  2 
  mm; 
  width 
  of 
  head 
  6.^ 
  mm, 
  of 
  abdomen 
  8 
  mm. 
  

  

  Body 
  elongate, 
  depressed, 
  with 
  the 
  long 
  abdomen 
  regularly 
  tapering 
  

   for 
  half 
  its 
  length 
  ; 
  the 
  fringe 
  of 
  hairs 
  on 
  lateral 
  margins 
  very 
  dense 
  and 
  

   soft; 
  color 
  yellowish 
  brown, 
  darker 
  on 
  the 
  sides 
  of 
  the 
  thorax; 
  eyes 
  

   black; 
  ocelli 
  yellowish; 
  a 
  double 
  row 
  of 
  trapezoidal 
  blackish 
  spots 
  on 
  

   the 
  abdomen 
  between 
  the 
  middorsal 
  line 
  and 
  the 
  line 
  of 
  scars 
  each 
  side, 
  

   each 
  spot 
  with 
  a 
  prolonged 
  external 
  apical 
  angle 
  reaching 
  the 
  apical 
  

   carina 
  on 
  each 
  segment, 
  the 
  spots 
  on 
  segments 
  9 
  and 
  10 
  becoming 
  

   diffused 
  over 
  the 
  sides 
  of 
  the 
  segments 
  ; 
  a 
  series 
  of 
  minute, 
  longitudinal 
  

   yellowish 
  dashes 
  in 
  the 
  apical 
  sutural 
  area 
  of 
  each 
  segment. 
  That 
  so 
  

   much 
  of 
  color 
  pattern 
  is 
  observable 
  is 
  doubtless 
  due 
  to 
  the 
  fact 
  that 
  these 
  

   nymphs 
  live 
  in 
  comparatively 
  clean 
  sand. 
  

  

  Abdomen 
  depressed, 
  and 
  with 
  a 
  well 
  marked 
  middorsal 
  impressed 
  

   line, 
  and 
  no 
  dorsal 
  hooks, 
  save 
  the 
  merest 
  rudiment 
  on 
  the 
  apex 
  of 
  the 
  

   ninth 
  segment 
  ; 
  lateral 
  spines 
  well 
  developed 
  on 
  segments 
  6-9 
  (there 
  are 
  

   tufts 
  of 
  hairs 
  on 
  the 
  latter 
  apical 
  angles 
  of 
  segments 
  before 
  the 
  sixth) 
  in- 
  

   creasing 
  a 
  little 
  in 
  size 
  posteriorly, 
  those 
  of 
  the 
  ninth 
  segment 
  closely 
  

   appressed, 
  and 
  hardly 
  surpassing 
  the 
  base 
  of 
  the 
  tenth 
  segment. 
  

  

  Mentum 
  of 
  labium 
  a 
  third 
  longer 
  than 
  wide; 
  front 
  border 
  of 
  median 
  

   lobe 
  nearly 
  straight, 
  with 
  a 
  sparse 
  fringe 
  of 
  flattened 
  scale 
  like 
  hairs; 
  

   lateral 
  lobe 
  strongly 
  incurved 
  at 
  about 
  a 
  right 
  angle 
  beyond 
  the 
  base 
  of 
  

   the 
  movable 
  hook; 
  about 
  four 
  teeth 
  on 
  the 
  inner 
  margin, 
  increasing 
  a 
  

   little 
  in 
  size 
  posteriorly. 
  

  

  While 
  nymphs 
  of 
  several 
  sizes 
  were 
  taken 
  together 
  in 
  the 
  creek, 
  they 
  

   seemed 
  to 
  have 
  a 
  definite 
  period, 
  including 
  hardly 
  more 
  than 
  the 
  month 
  

   of 
  July, 
  for 
  transforming. 
  

  

  Aug. 
  2 
  was 
  the 
  date 
  of 
  the 
  first 
  imago 
  captured 
  at 
  large. 
  June 
  30 
  

   was 
  the 
  date 
  of 
  the 
  first 
  imago 
  bred. 
  

  

  