﻿434 
  

  

  NEW 
  YORK- 
  STATE 
  MUSEUM 
  

  

  Family 
  aesckcnidae 
  

  

  This 
  family 
  contains 
  four 
  subfamilies 
  that 
  are 
  so 
  different 
  in 
  character 
  

   and 
  habits 
  they 
  may 
  be 
  best 
  discussed 
  separately. 
  The 
  following 
  keys 
  

   will 
  serve 
  for 
  their 
  separation. 
  

  

  KEY 
  TO 
  SUBFAMILIES 
  

  

  Iniagos 
  

   a 
  Stigma 
  braced 
  at 
  its 
  inner 
  end 
  against 
  an 
  inclined 
  cross 
  vein 
  in 
  the 
  space 
  

   below 
  it 
  (see 
  fig. 
  9) 
  

   6 
  Cubital 
  vein 
  in 
  the 
  fore 
  wing 
  extending 
  directly 
  to 
  the 
  hind 
  angle 
  of 
  the 
  tri- 
  

   angle, 
  not 
  appearing 
  forked 
  ; 
  subtriangle 
  consisting 
  of 
  one 
  cell, 
  or 
  

   indistinctly 
  developed 
  

  

  c 
  Eyes 
  widely 
  separated 
  on 
  the 
  top 
  of 
  the 
  head 
  Gomphinae 
  

  

  CO 
  Eyes 
  approximated 
  on 
  the 
  top 
  of 
  the 
  head 
  Aeschninae 
  p. 
  462 
  

  

  Ih 
  Cubital 
  vein 
  in 
  the 
  fore 
  wing 
  apparently 
  forked 
  at 
  the 
  base 
  of 
  the 
  second 
  

  

  cubito 
  anal 
  cross 
  vein 
  ; 
  subtriangle 
  of 
  three 
  cells. 
  Petal 
  urinae 
  p. 
  472 
  

  

  aa 
  Stigma 
  without 
  a 
  brace 
  vein 
  Cordulegasteriuae 
  p. 
  473- 
  

  

  Aymp/is 
  

   a 
  Labium 
  flat 
  (or 
  with 
  the 
  edges 
  of 
  the 
  lateral 
  lobes 
  slightly 
  upturned 
  in 
  

   Tachopteryx), 
  and 
  withou 
  t 
  raptorial 
  setae 
  

   & 
  Labium 
  with 
  its 
  median 
  lobe 
  entire; 
  antennae 
  four 
  jointed, 
  the 
  fourth 
  joint 
  

   rudimentary 
  ; 
  fore 
  tarsi 
  two 
  jointed 
  : 
  burrowing 
  nymphs. 
  Gomphinae 
  

  

  &6 
  Labium 
  with 
  a 
  short 
  median 
  cleft 
  (fig. 
  8B) 
  ; 
  antennae 
  seven 
  jointed, 
  

   setaceous 
  ; 
  tarsi 
  three 
  jointed 
  ; 
  climbing 
  nymphs, 
  with 
  eyes 
  at 
  sides 
  of 
  head 
  

  

  Aeschninae 
  

  

  66& 
  Labium 
  with 
  a 
  shallow 
  median 
  cleft 
  (fig. 
  15) 
  ; 
  antennae 
  seven 
  jointed, 
  

  

  short; 
  squatting 
  nymphs, 
  with 
  face 
  vertical, 
  and 
  eyes 
  on 
  anterolateral 
  

  

  angles 
  ; 
  depressed, 
  hairy 
  ; 
  tarsi 
  three 
  jointed 
  P 
  e 
  t 
  a 
  1 
  u 
  r 
  i 
  n 
  a 
  e 
  

  

  aa 
  Labium 
  spoon 
  sbaped, 
  with 
  raptorial 
  setae, 
  differs 
  from 
  libellulid 
  nymphs 
  

   in 
  having 
  the 
  prominent 
  median 
  lobe 
  of 
  the 
  labium 
  cleft 
  into 
  two 
  vari- 
  

   ously 
  formed 
  teeth 
  at 
  apex 
  (fig. 
  16) 
  Cordulegasterinae 
  

  

  Subfamily 
  goimfhinae 
  

   Mostly 
  large 
  species, 
  with 
  clear 
  wings, 
  bodies 
  striped 
  with 
  black 
  and 
  

   green 
  or 
  yellow, 
  of 
  strong 
  but 
  not 
  well 
  sustained 
  flight, 
  inhabiting 
  mostly 
  

  

  Fig. 
  10 
  Diagram 
  illustrating 
  the 
  parts 
  of 
  the 
  bead 
  and 
  thorax 
  chiefly 
  used 
  In 
  the 
  tables 
  (Lan 
  

   thus 
  albistylus 
  Sel.vs 
  ). 
  ^head 
  seen 
  from 
  front; 
  eeye; 
  /f 
  rons 
  ; 
  p 
  postclypeus 
  ; 
  ganteclly 
  

   pens; 
  rlabrum: 
  s 
  edge 
  of 
  labium 
  ; 
  f 
  side 
  of 
  mandible 
  ; 
  wgena: 
  a; 
  vertex, 
  bearing 
  the 
  three 
  ocelli 
  

   and 
  the 
  antennae 
  ; 
  o 
  occiput. 
  B 
  Thorax 
  from 
  the 
  side 
  ; 
  m 
  prothorax 
  ; 
  « 
  abdomen; 
  a 
  and 
  & 
  consoli- 
  

   dated 
  meso- 
  and 
  metathorax 
  ; 
  b 
  collar; 
  c 
  carina; 
  d 
  crest; 
  x,y,z 
  Arst 
  (humeral;, 
  second 
  and 
  third, 
  

   latural 
  sutures 
  and 
  stripes 
  ; 
  2 
  and 
  3, 
  bases 
  of 
  middle 
  and 
  hind 
  legs 
  respectively 
  

  

  