﻿484 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  The 
  few 
  nymphs 
  I 
  have 
  found 
  were 
  all 
  obtained 
  from 
  clayey 
  banks 
  

   among 
  wave- 
  washed 
  roots 
  of 
  trees, 
  in 
  places 
  most 
  difficult 
  to 
  use 
  a 
  

   net. 
  

  

  Macromia 
  taeniolata 
  Rambur 
  

  

  1842 
  Macromia 
  taeniolata 
  Eambur, 
  Ins. 
  Neur. 
  p. 
  139 
  

   1861 
  Macromia 
  taeniolata 
  Hagen, 
  Synopsis 
  Neur. 
  N. 
  Am. 
  p. 
  132 
  

   1874 
  Macromia 
  taeniolata 
  Hagen, 
  Bost. 
  soc. 
  nat. 
  hist. 
  Proc. 
  16 
  : 
  359 
  

   1893 
  Macromia 
  taeniolata 
  Calvert, 
  Am. 
  ent. 
  soc. 
  Trans. 
  20 
  : 
  250 
  (de- 
  

   scription) 
  

  

  1899 
  Macromia 
  taeniolata 
  Kellicott, 
  Odon. 
  Ohio, 
  p. 
  86 
  (description) 
  

  

  1900 
  Macromia 
  taeniolata 
  Williamson, 
  Dragon 
  flies 
  Ind. 
  p. 
  309 
  (de- 
  

  

  scription) 
  

   1890 
  Macromia 
  taeniolata 
  (nymph, 
  supposition) 
  Cabot, 
  Immature 
  state 
  

   Odon. 
  Pt 
  3, 
  p. 
  9, 
  pi. 
  2, 
  fig. 
  4. 
  

  

  Distributed 
  from 
  Pennsylvania 
  to 
  Florida 
  and 
  Illinois. 
  

  

  KEY 
  TO 
  NORTH 
  AMERICAN 
  GENERA 
  OF 
  CORDULINAE 
  (s. 
  sir.) 
  

  

  Imagos 
  

  

  a 
  Veins 
  M4 
  and 
  Cui 
  in 
  the 
  fore 
  wing 
  parallel 
  or 
  a 
  little 
  divergent 
  apically, 
  the 
  

   number 
  of 
  rows 
  of 
  cells 
  between 
  them 
  increasing 
  toward 
  the 
  margin 
  of 
  the 
  

  

  wingi 
  Neurocordulia 
  

  

  aa 
  Veins 
  M4 
  and 
  Cui 
  in 
  the 
  fore 
  wing 
  approximated 
  toward 
  the 
  margin 
  of 
  the 
  wing 
  

   6 
  The 
  second 
  cubito-anal 
  cross 
  vein 
  (and 
  therefore, 
  the 
  subtriangle) 
  normally 
  

   present 
  in 
  the 
  hind 
  wing 
  (absent 
  occasionally 
  in 
  Helocordulia)"' 
  

  

  c 
  Triangle 
  of 
  hind 
  wing 
  divided 
  by 
  a 
  cross 
  vein 
  Epicordulia 
  

  

  CQ 
  Triangle 
  of 
  hind 
  wing 
  without 
  cross 
  vein, 
  open 
  

  

  6i 
  Anal 
  loop 
  symmetrically 
  truncated 
  at 
  its 
  distal 
  end, 
  with 
  but 
  three 
  

   cells 
  at 
  the 
  end 
  ; 
  stigma 
  very 
  narrow 
  and 
  sharp-pointed 
  at 
  its 
  ends 
  

  

  Helocordulia 
  

   dd 
  Anal 
  loop 
  unsymmetrically 
  truncated 
  at 
  its 
  distal 
  end, 
  with 
  more 
  than 
  

   three 
  cells 
  at 
  the 
  end 
  ; 
  stigma 
  wider 
  and 
  less 
  sharply 
  pointed 
  

  

  Somatochlora 
  

   lib 
  The 
  second 
  cubito-anal 
  cross 
  vein 
  absent 
  in 
  the 
  hind 
  wing 
  

  

  c 
  Triangle 
  of 
  the 
  fore 
  wing 
  traversed 
  by 
  a 
  cross 
  veiu, 
  with 
  two 
  complete 
  

   rows 
  of 
  cells 
  in 
  the 
  space 
  beyond 
  it 
  

   d 
  Wings 
  with 
  black 
  basal 
  markings; 
  inferior 
  appendage 
  of 
  the 
  male, 
  not 
  

   bifurcated 
  Tetragoneuria 
  

  

  1 
  One 
  species, 
  the 
  little 
  Cordulia 
  lintneri 
  of 
  Hagen, 
  may 
  seem 
  to 
  belong 
  in 
  this 
  section 
  of 
  

   the 
  table, 
  th 
  ough. 
  of 
  course, 
  not 
  In 
  the 
  genus 
  Neurocordulia; 
  it 
  is 
  also 
  a 
  synthetic 
  type, 
  lack- 
  

   ing 
  the 
  special 
  corduline 
  features 
  of 
  venation, 
  which 
  I 
  take 
  to 
  be 
  1) 
  the 
  approximation 
  of 
  veins 
  

   M^ 
  and 
  Cu 
  j 
  , 
  and 
  2) 
  the 
  general 
  reduction 
  of 
  cross 
  veins 
  ; 
  it 
  shows 
  strong 
  libelluline 
  affinities 
  \n 
  

   the 
  conformation 
  of 
  the 
  anal 
  loop 
  and 
  in 
  the 
  possession 
  of 
  a 
  half-antenodal 
  cross 
  vein 
  just 
  before 
  

   the 
  nodus. 
  We 
  may 
  expect 
  that 
  its 
  nymph 
  when 
  discovered 
  will 
  throw 
  light 
  on 
  its 
  true 
  relation- 
  

   ships. 
  I 
  leave 
  it 
  here 
  in 
  the 
  genus 
  Dor 
  o 
  cordulia 
  beside 
  the 
  two 
  species 
  with 
  which 
  It 
  has 
  

   hitherto 
  been 
  associated. 
  

  

  