﻿464 
  . 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Nymphs 
  

  

  These 
  are 
  known 
  for 
  all 
  the 
  foregoing 
  genera 
  except 
  G 
  o 
  m 
  p 
  h 
  - 
  

   a 
  e 
  s 
  c 
  h 
  n 
  a 
  : 
  the 
  nymphs 
  figured 
  and 
  described 
  by 
  Cabot 
  and 
  referred 
  

   by 
  supposition 
  to 
  that 
  genus, 
  were 
  the 
  males 
  of 
  B 
  o 
  y 
  e 
  r 
  i 
  a 
  (see 
  below 
  

   under 
  the 
  account 
  of 
  that 
  genus). 
  Among 
  all 
  our 
  nymphs 
  that 
  are 
  still 
  

   unknown, 
  that 
  of 
  Gomphaeschna 
  remains 
  one 
  of 
  the 
  most 
  de- 
  

   sirable 
  discoveries 
  yet 
  to 
  be 
  made. 
  

  

  a 
  Hind 
  angles 
  of 
  the 
  head 
  viewed 
  from 
  above, 
  sharply 
  angulate 
  

  

  6 
  Lateral 
  lobe 
  of 
  labium 
  squarely 
  truncate 
  on 
  apex. 
  Boyeria 
  

  

  && 
  Lat 
  eral 
  lobe 
  of 
  labium 
  with 
  taper-pointed 
  apex 
  Basiaeschna 
  

  

  aa 
  Hind 
  angles 
  of 
  the 
  head 
  obtusely 
  rounded 
  

  

  & 
  With 
  lateral 
  spines 
  on. 
  abdominal 
  segments 
  4-, 
  5- 
  or 
  6-9. 
  

   c 
  With 
  lateral 
  spines 
  on 
  segments 
  4-, 
  or 
  5-9 
  

  

  d 
  With 
  dorsal 
  books 
  on 
  abdominal 
  segments 
  7-9 
  Nasiaeschna 
  

  

  dd 
  With 
  no 
  dorsal 
  hooks 
  on 
  abdomen 
  Epiaeschna 
  

  

  cc 
  With 
  lateral 
  spines 
  on 
  abdomin 
  al 
  segments 
  6-9 
  ....Aesclina 
  

  

  Vd 
  With 
  lateral 
  spines 
  on 
  abdominal 
  segments 
  7-9 
  Anax 
  

  

  So 
  well 
  marked 
  are 
  these 
  genera 
  that 
  their 
  nymphs 
  may 
  be 
  recognized 
  

   by 
  the 
  following 
  

  

  Single 
  distinctive 
  characters 
  

  

  Nasiaeschna 
  alone 
  has 
  dorsal 
  hooks 
  on 
  the 
  abdomen. 
  

   Basiaeschna 
  alone 
  has 
  the 
  apices 
  of 
  its 
  lateral 
  labial 
  lobes 
  pointed. 
  

   Anax 
  alone 
  has 
  lateral 
  spines 
  on 
  abdominal 
  segments 
  7-9 
  only. 
  

   Ae 
  s 
  c 
  h 
  n 
  a 
  alone 
  has 
  lateral 
  spines 
  on 
  abdominal 
  segments 
  6-9 
  only. 
  

   Boyeria 
  alone 
  has 
  two 
  teeth 
  on 
  the 
  front 
  border 
  of 
  the 
  median 
  lobe 
  

  

  of 
  the 
  labium, 
  at 
  a 
  distance 
  either 
  side 
  from 
  the 
  median 
  cleft. 
  

   Epiaeschna 
  alone 
  is 
  lacking 
  in 
  all 
  the 
  above 
  characters. 
  

  

  GOMPHAESCHNA 
  

  

  The 
  single 
  regional 
  species 
  G. 
  furcillata 
  Say 
  has 
  not 
  been 
  taken 
  

   as 
  yet 
  within 
  this 
  state, 
  so 
  far 
  as 
  records 
  show. 
  Its 
  nymph 
  is 
  unknown, 
  

   that 
  one 
  referred 
  to 
  this 
  species 
  by 
  Cabot 
  on 
  supposition 
  proving 
  to 
  be 
  

   the 
  male 
  nymph 
  of 
  Boyeria, 
  described 
  below. 
  

  

  BOYERIA 
  

  

  This 
  genus 
  includes 
  the 
  single 
  North 
  American 
  species. 
  

   Boyeria 
  vinosa 
  Say 
  

  

  1839 
  Aeschna 
  vinosa 
  Say, 
  Acad. 
  nat. 
  sci. 
  Phil. 
  Jonr. 
  8:13 
  

   1839Ae8chna 
  4-guttata 
  Burmeister, 
  Haudb. 
  ent. 
  2 
  : 
  837 
  

   1861 
  Aeschna 
  4-guttata 
  Hagen, 
  Synopsis 
  Neur. 
  N. 
  Am. 
  p. 
  130 
  

   1875 
  Neuraeschua 
  vinosa 
  Hagen, 
  Bost. 
  soc. 
  nat. 
  hist, 
  Proc. 
  18:37 
  .(full 
  

   bibliography 
  and 
  distribution) 
  

  

  