﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  513 
  

  

  The 
  egg 
  (pi. 
  19, 
  fig. 
  8) 
  is 
  oblong 
  oval, 
  at 
  first 
  white, 
  turning 
  brownish 
  

   gray 
  after 
  a 
  few 
  hours 
  ; 
  its 
  surface 
  is 
  closely 
  beset 
  with 
  minute 
  tubercu- 
  

   late 
  granulations. 
  The 
  gelatinous 
  envelop 
  is 
  scanty. 
  

  

  The 
  nymphs 
  clamber 
  about 
  over 
  trashy 
  submerged 
  vegetation 
  ; 
  they 
  

   cHmb 
  well, 
  but 
  swim 
  very 
  poorly. 
  They 
  are 
  cleaner 
  and 
  less 
  sprawling 
  

   than 
  the 
  Libellulas. 
  The 
  nymph 
  goes 
  no 
  farther 
  from 
  the 
  edge 
  of 
  the 
  

   water 
  to 
  transform 
  than 
  is 
  necessary 
  to 
  find 
  a 
  suitable 
  place 
  — 
  generally 
  

   but 
  a 
  few 
  inches. 
  

  

  Nymph. 
  Total 
  length 
  15 
  mm; 
  abdomen 
  9 
  mm 
  ; 
  hind 
  femur 
  5.5 
  mm; 
  

   width 
  of 
  head 
  4.5 
  mm, 
  of 
  abdomen 
  6 
  mm. 
  

  

  Head 
  wider 
  than 
  long, 
  sHghtly 
  concave 
  behind, 
  widest 
  across 
  the 
  

   rounded 
  eyes, 
  which 
  are 
  at 
  the 
  middle 
  of 
  its 
  length; 
  labium 
  (fig. 
  8A) 
  

   short, 
  not 
  extending 
  posteriorly 
  beyond 
  the 
  bases 
  of 
  the 
  first 
  pair 
  of 
  legs; 
  

   lateral 
  setae 
  five 
  ; 
  mental 
  setae 
  about 
  nine 
  or 
  10, 
  the 
  two 
  innermost 
  ones 
  

   minute 
  and 
  out 
  of 
  line 
  with 
  the 
  others, 
  the 
  fifth 
  (counting 
  from 
  the 
  side) 
  

   longest 
  ; 
  teeth 
  crenate, 
  well 
  marked, 
  each 
  armed 
  with 
  several 
  spinules 
  ; 
  

   hook 
  short, 
  little^curved, 
  differing 
  much 
  from 
  the 
  setae 
  behind 
  it 
  in 
  its 
  

   greater 
  thickness 
  and 
  less 
  length. 
  

  

  Femora 
  twice 
  ringed 
  with 
  black 
  ; 
  wing 
  cases 
  extending 
  over 
  the 
  sixth 
  

   abdominal 
  segment. 
  

  

  Abdomen 
  (fig. 
  8C) 
  broad, 
  depressed, 
  triquetral, 
  in 
  outline 
  oblong 
  oval; 
  

   lateral 
  spines 
  on 
  segments 
  8 
  and 
  9, 
  short; 
  dorsal 
  hooks 
  on 
  segments 
  3-9 
  ; 
  

   these 
  form 
  a 
  regularly 
  descending 
  curve, 
  and, 
  viewed 
  laterally, 
  look 
  like 
  

   a 
  segment 
  of 
  a 
  circular 
  saw; 
  superior 
  and 
  inferior 
  appendages 
  equal; 
  

   the 
  laterals 
  halC 
  as 
  long. 
  

  

  CELITHEMIS 
  

  

  Two 
  species 
  of 
  this 
  genus, 
  C. 
  e 
  p 
  o 
  n 
  i 
  n 
  a 
  and 
  C. 
  e 
  1 
  i 
  s 
  a, 
  are 
  known 
  

   from 
  this 
  state, 
  and 
  a 
  third, 
  C. 
  o 
  r 
  n 
  a 
  t 
  a, 
  may 
  be 
  looked 
  for 
  toward 
  the 
  

   coast. 
  These 
  are 
  three 
  of 
  the 
  most 
  beautiful 
  among 
  all 
  our 
  smaller 
  

   species. 
  Their 
  colors 
  are 
  shades 
  of 
  black, 
  red, 
  yellow 
  and 
  brown 
  ; 
  and 
  

   the 
  wings 
  in 
  all 
  have 
  a 
  distinct 
  color 
  pattern. 
  

  

  The 
  nvmphs 
  are 
  known 
  for 
  the 
  two 
  species 
  recorded 
  from 
  the 
  state. 
  

   They 
  agree 
  in 
  having 
  smooth 
  bodies 
  with 
  depressed 
  abdomen 
  and 
  long 
  

   lateral 
  spines. 
  The 
  head 
  is 
  wider 
  than 
  long, 
  widest 
  across 
  the 
  very 
  

   prominent 
  eyes, 
  which 
  at 
  their 
  sides 
  are 
  almost 
  angulate, 
  they 
  project 
  so 
  

   sharply; 
  the 
  labium 
  is 
  very 
  large, 
  and 
  has 
  numerous 
  very 
  long 
  and 
  

   slender 
  raptorial 
  setae, 
  and 
  a 
  pair 
  of 
  very 
  long 
  thin 
  movable 
  hooks 
  ; 
  the 
  

   teeth 
  are 
  almost 
  obsolete, 
  but 
  the 
  spinules 
  which 
  arin 
  them 
  remain. 
  The 
  

   abdomen 
  is 
  scarcely 
  narrowed 
  posteriorly 
  before 
  the 
  ninth 
  segment, 
  so 
  

   that 
  the 
  side 
  margins 
  seem 
  to 
  be 
  continued 
  posteriorly 
  in 
  the 
  long 
  spines 
  

   of 
  that 
  segment. 
  The 
  superior 
  appendage 
  is 
  one 
  fourth, 
  and 
  the 
  lateral 
  

   appendages 
  are 
  one 
  half 
  shorter 
  than 
  the 
  inferiors. 
  Images 
  and 
  the 
  two 
  

   known 
  species 
  of 
  nymphs 
  naay 
  be 
  separated 
  by 
  the 
  following 
  key. 
  

  

  