﻿494 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Tetragoneuria 
  cynosura 
  Say 
  

  

  Dog-tail 
  

  

  1839 
  Libellula 
  cynosura 
  Say, 
  Acad. 
  iiat. 
  sei. 
  Phil. 
  Jour. 
  8:30 
  

   1839 
  E 
  p 
  op 
  h 
  thai 
  mi 
  a 
  lateralis 
  Burmeister, 
  Handb. 
  eut. 
  2:847 
  

  

  1873 
  Cordulia 
  cyuosura 
  Hagen, 
  Best. 
  soc. 
  nat. 
  hist. 
  Proc. 
  15 
  : 
  271 
  

  

  1861 
  Cordulia 
  lateralis 
  Hagen, 
  Sj'iiopsisNeur. 
  N.Am. 
  13.139 
  (descriptiou) 
  

   1893 
  Tetrago 
  n 
  euri 
  a 
  cynosura 
  Calvert, 
  Am. 
  eut. 
  soc. 
  Trans. 
  20:252 
  

  

  (descriptiou) 
  

   1895-97 
  Tetrago 
  n 
  euri 
  a 
  cynosura 
  Calvert, 
  N. 
  Y. 
  ent. 
  soc. 
  Jour. 
  3:46 
  

  

  and 
  5 
  : 
  93 
  (listed 
  from 
  Ithaca, 
  Lake 
  George, 
  Black 
  Rock) 
  

   Tetragoneuria 
  cynosura 
  Kellicott, 
  Odon. 
  Obio,p, 
  89 
  (descriptiou) 
  

   1900 
  Tetragoneuria 
  cynosura 
  Williamson, 
  Dragou 
  flies 
  Ind. 
  p. 
  311 
  

   1890 
  Epitheca 
  cynosura 
  (nymph) 
  Cabot, 
  Immature 
  state 
  Odon. 
  pt 
  3, 
  p. 
  28 
  

  

  This 
  species, 
  which 
  has 
  hitherto 
  been 
  recorded 
  from 
  but 
  few 
  localities 
  

   within 
  the 
  state, 
  is 
  likely 
  to 
  be 
  found 
  in 
  most 
  large 
  ponds 
  in 
  central 
  and 
  

   western 
  New 
  York. 
  I 
  have 
  but 
  one 
  additional 
  locality 
  to 
  record. 
  I 
  

   have 
  received 
  specimens 
  from 
  Prof. 
  Herrick 
  collected 
  at 
  Canandaigua., 
  

  

  I 
  have 
  not 
  united 
  with 
  this 
  species 
  semiaquea 
  Burmeister, 
  notwith- 
  

   standing 
  that 
  I 
  think 
  them 
  one 
  species 
  showing 
  racial 
  variations, 
  because 
  

   there 
  is 
  no 
  difficulty, 
  so 
  far 
  as 
  I 
  have 
  observed, 
  in 
  separating 
  the 
  imagos 
  

   on 
  the 
  basis 
  of 
  the 
  -color 
  distinction 
  long 
  in 
  use, 
  and 
  because 
  my 
  bred 
  

   nymphs 
  do 
  not 
  agree 
  very 
  closely, 
  and 
  I 
  have 
  not 
  had 
  time 
  for 
  the 
  study 
  

   of 
  a 
  long 
  series 
  of 
  these 
  nymphs. 
  I 
  would 
  call 
  attention, 
  however, 
  to 
  

   a 
  fact 
  indicating 
  either 
  that 
  they 
  will 
  probably 
  be 
  found 
  to 
  intergrade, 
  or 
  

   that 
  some 
  one 
  has 
  made 
  an 
  error 
  or 
  mixed 
  his 
  specimens. 
  Cabot 
  de- 
  

   scribed 
  a 
  longer 
  and 
  a 
  shorter 
  type 
  of 
  nymph 
  of 
  the 
  straight-spined 
  

   form 
  : 
  the 
  one 
  with 
  the 
  longer 
  spines 
  was 
  bred 
  and 
  was 
  T. 
  cynosura; 
  

   the 
  one 
  with 
  the 
  shorter 
  spines 
  was 
  referred 
  to 
  T. 
  semiaquea 
  on 
  sup- 
  

   position. 
  From 
  the 
  shorter 
  spined 
  of 
  my 
  two 
  with 
  straight 
  spines 
  I 
  bred 
  

   abundantly 
  in 
  Illinois 
  the 
  typical 
  T. 
  cynosura. 
  I 
  have 
  observed, 
  

   however, 
  that 
  there 
  is 
  considerable 
  variation 
  in 
  the 
  length 
  of 
  these 
  

   spines: 
  there 
  seems 
  to 
  be 
  much 
  less 
  of 
  it 
  in 
  their 
  direction. 
  While 
  it 
  

   seems 
  likely 
  that 
  T. 
  semiaquea 
  will 
  eventually 
  rank 
  as 
  a 
  race 
  of 
  T. 
  

   cynosura, 
  pending 
  farther 
  study, 
  I 
  have 
  listed 
  them 
  separately 
  

   here. 
  

  

  Tetragoneuria 
  semiaquea 
  Burmeister 
  

  

  1839 
  Libellula 
  semiaquea 
  Burmeister, 
  Handb. 
  ent. 
  2 
  : 
  858 
  

   1842 
  Cordulia 
  complanata 
  Rambur, 
  Ins. 
  Neur. 
  p. 
  145 
  

  

  1874 
  Corduliasemiaquea 
  Hagea, 
  Bost. 
  soc. 
  nat. 
  hist. 
  Proc. 
  16 
  : 
  360 
  

  

  1861 
  Tetragoneuria 
  semiaquea 
  Hageu, 
  Synopsis 
  Neur. 
  N. 
  Am. 
  p. 
  140 
  

  

  (description) 
  

   1893 
  Tetragoneuria 
  semiaquea 
  Calvert, 
  Am. 
  ent. 
  soc. 
  Trans. 
  20 
  : 
  252 
  

   1895-97 
  Tetragoneuria 
  semiaquea 
  Calvert, 
  N. 
  Y. 
  ent. 
  soc. 
  Jour. 
  3 
  : 
  46 
  

  

  and 
  5 
  : 
  93 
  (listed 
  from 
  Ithaca, 
  Baldwinsville, 
  Black 
  Rock) 
  

  

  