﻿432 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Of 
  these 
  three 
  papers 
  the 
  first 
  named 
  is 
  most 
  complete 
  for 
  the 
  period 
  

   it 
  covers, 
  and 
  it 
  is 
  the 
  only 
  one 
  containing 
  any 
  reference 
  to 
  the 
  literature 
  

   of 
  the 
  immature 
  stages. 
  

  

  The 
  four 
  descriptive 
  papers 
  most 
  continuously 
  referred 
  to 
  in 
  the 
  bibli- 
  

   ographies 
  of 
  images 
  are 
  : 
  

  

  Hagen, 
  H. 
  A. 
  Synopsis 
  of 
  tbe 
  Neuroptera 
  of 
  North 
  America. 
  Smithsoiiiaii 
  

   inst. 
  Misc. 
  coll. 
  1861. 
  

  

  Calvert, 
  P. 
  P. 
  Catalogue 
  of 
  the 
  Odonata 
  of 
  Philadelphia 
  and 
  vicinity. 
  Am 
  

   ent, 
  soc. 
  Trans. 
  1893. 
  20 
  : 
  152-272, 
  2pl. 
  

  

  Kellicott. 
  Odonata 
  of 
  Ohio 
  (a 
  posthumous 
  paper, 
  completed 
  and 
  edited 
  by 
  

   James 
  S. 
  Hitie). 
  O, 
  state 
  acid. 
  sci. 
  Special 
  papers, 
  uo. 
  2. 
  1889. 
  

  

  Williamson, 
  E. 
  B. 
  Dragon 
  flies 
  of 
  Iinliana. 
  Dep'tgeol. 
  and 
  natural 
  resources 
  

   of 
  Indiana. 
  24th 
  an. 
  rep't 
  1900. 
  p. 
  233-333, 
  7 
  pi. 
  

  

  The 
  first 
  of 
  these 
  papers 
  is 
  out 
  of 
  print 
  ; 
  the 
  others 
  m.ay 
  be 
  obtained 
  

   through 
  the 
  organizations 
  under 
  whose 
  auspices 
  they 
  were 
  published. 
  

  

  The 
  bibliographies 
  given 
  below, 
  being 
  solely 
  designed 
  to 
  aid 
  the 
  user 
  

   of 
  this 
  paper, 
  are 
  intended 
  to 
  cover 
  the 
  following 
  points. 
  

  

  1 
  The 
  original 
  description 
  of 
  the 
  species 
  

  

  2 
  The 
  principal 
  descriptions 
  which 
  have 
  introduced 
  synonyms 
  

  

  3 
  All 
  available 
  descriptions 
  and 
  figures 
  in 
  American 
  periodicals 
  

  

  4 
  The 
  records 
  of 
  the 
  occurrence 
  of 
  the 
  species 
  in 
  this 
  state 
  ; 
  at 
  least 
  

   Calvert's 
  summary 
  of 
  such 
  records. 
  (In 
  most 
  cases 
  I 
  have 
  not 
  thought 
  

   it 
  desirable 
  to 
  go 
  back 
  of 
  this: 
  Calvert's 
  paper 
  is 
  cited 
  on 
  p. 
  430). 
  

  

  5 
  All 
  available 
  descriptions 
  and 
  figures 
  of 
  the 
  nymphs 
  of 
  our 
  species. 
  

   It 
  will 
  be 
  convenient 
  to 
  treat 
  here 
  as 
  famihes 
  the 
  two 
  groups 
  that 
  are 
  

  

  so 
  recognized 
  in 
  the 
  descriptive 
  works 
  to 
  which 
  our 
  bibliographic 
  refer- 
  

   ences 
  refer. 
  These 
  may 
  be 
  separated 
  by 
  the 
  following 
  keys. 
  The 
  tech- 
  

   nical 
  terms 
  used 
  in 
  the 
  keys 
  are 
  explained 
  in 
  figures 
  8 
  to 
  10. 
  

  

  KEY 
  TO 
  FAMILIES 
  

  

  Iviagos 
  

  

  a 
  Triangle 
  (see 
  fig. 
  9) 
  about 
  equally 
  distant 
  from 
  arculus 
  in 
  fore 
  and 
  hind 
  

   wing 
  ; 
  stigma 
  with 
  a 
  brace 
  veiu 
  at 
  it 
  sinner 
  end 
  (except 
  in 
  Cordulegas- 
  

  

  ter) 
  Aescbnidae 
  p. 
  434 
  

  

  aa 
  Triangle 
  in 
  the 
  hind 
  wing 
  much 
  nearer 
  the 
  arculus 
  than 
  in 
  the 
  fore 
  wing 
  ; 
  

   stigma 
  without 
  brace 
  vein 
  Libellulidae 
  p. 
  478 
  

  

  JVymJ>/is 
  

  

  a 
  Labium 
  (see 
  fig. 
  8) 
  flat 
  or 
  nearly 
  so, 
  without 
  raptorial 
  setae 
  (except 
  in 
  

   Cordulegaster, 
  which 
  has 
  the 
  labium 
  spoon 
  shaped, 
  and 
  the 
  median 
  

   lobe 
  cleft 
  at 
  the 
  summit 
  of 
  a 
  prominent 
  median 
  angle 
  into 
  two 
  divergent 
  

  

  teeth) 
  Aeschnidae 
  

  

  aa 
  Labium 
  mask 
  shaped 
  or 
  spoon 
  shaped, 
  when 
  closed 
  covering 
  the 
  face 
  up 
  to 
  

   the 
  bases 
  of 
  the 
  antennae, 
  armed 
  with 
  raptorial 
  setae 
  Libellulidae 
  

  

  