﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  519 
  

  

  points 
  at 
  the 
  ends 
  of 
  the 
  stigma 
  as 
  in 
  the 
  male, 
  but 
  they 
  are 
  more 
  flaves- 
  

   cent 
  in 
  their 
  basal 
  half. 
  The 
  vulvar 
  lamina 
  is 
  very 
  short, 
  being 
  very 
  

   much 
  broader 
  than 
  long, 
  with 
  a 
  quadrangular 
  excavation 
  in 
  the 
  middle 
  

   separating 
  its 
  two 
  low 
  lobes 
  widely 
  ; 
  far 
  beyond 
  the 
  apices 
  of 
  these 
  two 
  

   lobes 
  and 
  near 
  the 
  middle 
  of 
  the 
  venter 
  of 
  the 
  ninth 
  segment 
  there 
  is 
  a 
  

   pair 
  of 
  minute, 
  erect 
  quadrangular 
  prominences 
  ; 
  the 
  apical 
  margin 
  of 
  

   the 
  venter 
  of 
  the 
  ninth 
  segment 
  is 
  very 
  convex. 
  

  

  I 
  observe 
  in 
  my 
  specimens 
  considerable 
  variation 
  in 
  the 
  size 
  of 
  the 
  

   males: 
  32 
  to 
  37 
  mm 
  in 
  length; 
  the 
  genitaHa, 
  however, 
  are 
  quite 
  constant 
  

   in 
  form 
  and 
  agree 
  well 
  with 
  the 
  figures 
  by 
  Hagen 
  cited 
  above. 
  

  

  Nymph. 
  (PI. 
  lo, 
  fig. 
  i, 
  2) 
  Total 
  length 
  18 
  mm; 
  abdomen 
  10 
  mm; 
  

   hind 
  femur 
  5.5 
  mm; 
  width 
  of 
  head 
  5.5 
  mm, 
  of 
  abdomen 
  6.7 
  mm. 
  

  

  Unfortunately, 
  I 
  obtained 
  but 
  few 
  ixymphs, 
  and 
  reared 
  them 
  all, 
  so 
  

   that 
  I 
  have 
  nothing 
  left 
  but 
  the 
  cast 
  skins 
  for 
  description; 
  these 
  do 
  not 
  

   preserve 
  well 
  the 
  nymphal 
  color 
  pattern 
  when 
  dry 
  ; 
  there 
  is 
  enough 
  of 
  it 
  

   left 
  to 
  show 
  that 
  the 
  coloration 
  is 
  similar 
  to 
  that 
  of 
  L. 
  in 
  tact 
  a 
  de- 
  

   scribed 
  above, 
  though 
  probably 
  not 
  so 
  well 
  marked. 
  The 
  nymph 
  is 
  so 
  

   very 
  similar 
  to 
  the 
  preceding, 
  it 
  is 
  hardly 
  worth 
  while 
  to 
  repeat 
  the 
  de- 
  

   scription 
  in 
  detail. 
  The 
  more 
  salient 
  points 
  are 
  as 
  follows. 
  The 
  lateral 
  

   setae 
  are 
  11; 
  the 
  mental 
  setae 
  about 
  13, 
  of 
  which 
  the 
  sixth 
  (counting 
  

   from 
  the 
  side) 
  is 
  longest; 
  the 
  lateral 
  spines 
  of 
  the 
  eighth 
  abdominal 
  seg- 
  

   ment 
  are 
  a 
  trifle 
  longer 
  than 
  half 
  the 
  dorsal 
  length 
  of 
  the 
  ninth 
  segment 
  , 
  

   the 
  lateral 
  spines 
  of 
  the 
  ninth 
  segment 
  attain 
  to 
  the 
  level 
  of 
  the 
  tips 
  of 
  

   the 
  inferior 
  appendages, 
  which 
  are 
  scarcely 
  longer 
  than 
  the 
  superior 
  ap- 
  

   pendage. 
  The 
  dorsal 
  hooks 
  are 
  as 
  described 
  above 
  for 
  L. 
  in 
  tact 
  a; 
  

   excepting 
  that 
  the 
  apex 
  of 
  the 
  hook 
  of 
  the 
  eighth 
  segment 
  is 
  declined 
  so 
  

   that 
  it 
  rests 
  at 
  its 
  apex 
  on 
  the 
  dorsum 
  of 
  the 
  ninth 
  segment. 
  

  

  This 
  last 
  and 
  most 
  distinctive 
  character 
  between 
  the 
  two 
  species 
  is 
  

   shown 
  by 
  some 
  nymphs 
  which 
  were 
  collected 
  for 
  me 
  by 
  Chester 
  Y6ung 
  

   at 
  EUenville 
  N. 
  Y., 
  May 
  30, 
  189.7. 
  These, 
  from 
  the 
  Catskills, 
  may 
  be 
  

   the 
  nymphs 
  of 
  L. 
  glacial 
  is 
  also; 
  but, 
  among 
  so 
  many 
  species 
  so 
  

   much 
  alike, 
  and 
  so 
  few 
  of 
  them 
  bred, 
  they 
  can 
  not 
  be 
  so 
  determined 
  with 
  

   'certainty 
  as 
  yet. 
  

  

  The 
  eggs 
  are 
  roundish 
  oval, 
  with 
  a 
  moderate 
  investment 
  of 
  gelatin. 
  

   They 
  are 
  white 
  at 
  first, 
  but 
  turn 
  a 
  pale 
  lemon 
  yellow 
  after 
  a 
  number 
  of 
  

   hours. 
  They 
  are 
  dropped 
  by 
  the 
  female 
  in 
  flight 
  in 
  the 
  little 
  clear 
  pools 
  

   along 
  shore, 
  strewn 
  over 
  the 
  bottom 
  with 
  hemlock 
  leaves. 
  

  

  SYMPETRUM 
  

  

  This 
  large 
  genus 
  is 
  represented 
  in 
  New 
  York 
  state 
  by 
  seven 
  nominal 
  

   species, 
  and 
  an 
  eighth 
  is 
  regional. 
  Most 
  of 
  these 
  species 
  are 
  exceed- 
  

   ingly 
  common 
  along 
  marshy 
  shores 
  and 
  in 
  wet 
  meadows. 
  The 
  imagos 
  

   travel 
  often 
  considerable 
  distances 
  from 
  the 
  water, 
  and 
  at 
  the 
  proper 
  

   season 
  are 
  met 
  with 
  on 
  upland 
  meadows 
  very 
  commonly. 
  Because 
  of 
  

   their 
  famihar 
  habits 
  and 
  their 
  strikingly 
  brilliant 
  red 
  coloration, 
  they 
  are 
  

   very 
  well 
  known. 
  

  

  The 
  nymphs 
  are 
  very 
  like 
  those 
  of 
  Leucorhinia, 
  specially 
  the 
  

   species 
  placed 
  first 
  in 
  our 
  list; 
  but 
  they 
  are 
  (except 
  S. 
  corruptum) 
  

  

  