﻿470 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  I 
  am 
  not 
  able 
  to 
  distinguish 
  between 
  the 
  nymphs 
  of 
  these 
  species. 
  

   Constricta 
  and 
  clepsydra 
  were 
  both 
  common 
  at 
  Saranac 
  Inn 
  

   during 
  the 
  latter 
  half 
  of 
  the 
  summer. 
  I 
  collected 
  many 
  nymphs, 
  and 
  it 
  

   would 
  seem 
  likely 
  that 
  I 
  should 
  have 
  both 
  species 
  ; 
  but 
  I 
  have 
  found 
  

   hitherto 
  no 
  specific 
  differences 
  between 
  them. 
  The 
  imagos 
  of 
  the 
  three 
  

   species 
  are 
  similar 
  in 
  habits 
  and 
  are 
  often 
  found 
  flying 
  together. 
  It 
  is 
  

   probable 
  that 
  the 
  nymphs 
  are 
  likewise 
  similar 
  in 
  habits. 
  The 
  nymph 
  of 
  

   Aeschna 
  constricta 
  is 
  described 
  and 
  figured 
  by 
  Cabot 
  ^ 
  . 
  Descrip- 
  

   tions 
  of 
  these 
  three 
  species 
  will 
  be 
  found 
  in 
  the 
  monographs 
  of 
  Calvert, 
  

   Kellicott 
  and 
  Williamson, 
  frequently 
  cited 
  in 
  the 
  preceding 
  bibliographies 
  

   of 
  species. 
  Under 
  these 
  circumstances 
  it 
  seems 
  unnecessary 
  to 
  enter 
  

   into 
  a 
  detailed 
  discussion 
  of 
  them. 
  It 
  will 
  suffice, 
  for 
  the 
  certain 
  recog- 
  

   nition 
  of 
  nymphs 
  of 
  the 
  genus, 
  to 
  restate 
  the 
  chief 
  characters 
  of 
  the 
  

   nymph 
  of 
  A. 
  constricta, 
  a 
  species 
  which 
  I 
  have 
  bred 
  abundantly 
  

   at 
  Ithaca 
  and 
  at 
  Saranac 
  Inn. 
  

  

  Nymph. 
  Fully 
  grown 
  measures 
  in 
  total 
  length 
  43 
  mm, 
  abdomen 
  31 
  

   mm, 
  hind 
  femur 
  6,5 
  mm 
  ; 
  width 
  of 
  head 
  7.5 
  mm, 
  of 
  abdomen 
  7.5 
  mm. 
  

  

  Body 
  elongate, 
  graceful, 
  active 
  ; 
  color 
  varied 
  green 
  and 
  brown, 
  the 
  

   amount 
  of 
  either 
  color 
  varying 
  to 
  agree 
  with 
  environment, 
  the 
  paler 
  

   markings 
  of 
  the 
  dorsum 
  generally 
  tending 
  to 
  form 
  longitudinal 
  inter- 
  

   rupted 
  streaks. 
  

  

  Head 
  with 
  prominent, 
  well-rounded 
  eyes, 
  whose 
  hind 
  angles 
  almost 
  

   meet 
  on 
  the 
  vertex 
  ; 
  rear 
  of 
  head 
  hardly 
  convex 
  posteriorly 
  ; 
  hind 
  angles 
  

   broadly 
  rounded; 
  labium 
  moderately 
  widened 
  in 
  distal 
  half 
  of 
  mentum 
  ; 
  

   middle 
  lobe 
  with 
  closed 
  median 
  cleft 
  ; 
  lateral 
  lobe 
  squarely 
  truncate 
  on 
  

   end, 
  denticulate 
  within. 
  

  

  Abdomen 
  widest 
  in 
  the 
  middle, 
  where 
  the 
  segments 
  are 
  also 
  longest 
  ; 
  

   lateral 
  spines 
  on 
  segments 
  6-9, 
  on 
  6 
  minute, 
  on 
  9 
  a 
  little 
  longer 
  than 
  

   half 
  the 
  length 
  of 
  the 
  loth 
  segment; 
  inferior 
  appendages 
  longer 
  than 
  

   segments 
  9 
  and 
  10; 
  the 
  deeply 
  notched 
  superior 
  appendage 
  three 
  fourths 
  

   as 
  long 
  as 
  the 
  inferiors, 
  the 
  laterals 
  one 
  half 
  as 
  long 
  as 
  the 
  inferiors 
  and 
  

   with 
  very 
  sharp, 
  incurvate 
  points. 
  

  

  ANAX 
  

  

  The 
  single 
  species 
  discussed 
  below 
  properly 
  belongs 
  to 
  our 
  fauna: 
  

   another 
  tropical 
  species, 
  Anax 
  longipes 
  is 
  occasionally 
  picked 
  up 
  

   on 
  our 
  Atlantic 
  coast. 
  

  

  1773 
  Libellula 
  junia 
  Drury, 
  lllus. 
  exotic 
  eut. 
  v. 
  1, 
  pi. 
  47, 
  fig. 
  5ii 
  

  

  1842 
  Aeschna 
  spiniferus 
  Rambiir, 
  Ins. 
  Neur. 
  p. 
  186, 
  pi. 
  1, 
  %. 
  14 
  

  

  1854 
  Einmous, 
  Agric. 
  N. 
  Y. 
  v. 
  5, 
  pi. 
  15, 
  fig. 
  3 
  (colored 
  figure 
  of 
  the 
  

  

  male; 
  no 
  description 
  ; 
  no 
  name) 
  

   1861 
  Anax 
  Junius 
  Hagen, 
  Synopsis 
  Neur. 
  N. 
  Am. 
  p. 
  118 
  

   1875 
  Anax 
  Junius 
  Hagen, 
  Bost. 
  soc. 
  nat. 
  hist. 
  Proc. 
  18 
  : 
  32 
  CfuU 
  bibliography 
  

  

  and 
  distribution) 
  

  

  1 
  Immature 
  state 
  of 
  the 
  Odonata. 
  1881. 
  pt 
  2. 
  

  

  