﻿430 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  h 
  Squatting 
  nymphs, 
  with 
  the 
  face 
  vertical 
  and 
  the 
  eyes 
  capping 
  the 
  prominent 
  

   anterolateral 
  angles. 
  These 
  settle 
  themselves 
  on 
  the 
  trashy 
  pond 
  bottom, 
  

   some 
  of 
  them 
  covering 
  themselves 
  over 
  completely 
  with 
  sand 
  or 
  silt, 
  and 
  

   thus 
  await 
  in 
  ambuscade 
  the 
  approach 
  of 
  their 
  prey 
  (Cordulegasterinae, 
  

   Macromiinae, 
  and 
  some 
  Libellnlinae) 
  

  

  c 
  Climbing 
  and 
  clinging 
  nymphs, 
  with 
  cleaner, 
  slenderer, 
  more 
  active 
  bodies, 
  

   generally 
  showing 
  a 
  definite 
  color 
  pattern, 
  with 
  the 
  head 
  neither 
  cuueate 
  

   nor 
  vertical 
  in 
  front 
  (Agrionidae 
  Aeschninae, 
  and 
  some 
  Libellulinae) 
  

  

  All 
  nymphs, 
  when 
  ready 
  for 
  adult 
  life, 
  crawl 
  up 
  some 
  support 
  above 
  

   the 
  edge 
  of 
  the 
  water, 
  fix 
  their 
  claws 
  firmly 
  and 
  transform; 
  the 
  old 
  

  

  nymph 
  skin 
  is 
  left 
  attached 
  when 
  the 
  

   imago 
  flies 
  away. 
  Since 
  this 
  skin 
  pre- 
  

   serves 
  well 
  the 
  form 
  of 
  the 
  nymph^ 
  

   and 
  can 
  be 
  pinned 
  for 
  the 
  cabinet, 
  an 
  

   easy 
  way 
  to 
  gather 
  life 
  history 
  mate- 
  

   rial 
  for 
  dragon 
  flies 
  is 
  to 
  pick 
  them 
  up 
  

   when 
  newly 
  transformed 
  and 
  before 
  

   the 
  imagos 
  are 
  ready 
  to 
  fly, 
  place 
  in 
  a 
  

   coarse 
  paper 
  bag 
  each 
  imago 
  with 
  its 
  

   cast 
  nymph 
  skin, 
  writing 
  locahty, 
  date, 
  

   etc., 
  on 
  the 
  bag 
  and 
  closing 
  its 
  top, 
  

   leave 
  a 
  day 
  or 
  more 
  till 
  the 
  imago 
  

   Fig. 
  7 
  The 
  transformation 
  of 
  PI 
  a 
  them 
  is 
  assumcs 
  its 
  mature 
  coloration, 
  and 
  

  

  1 
  y 
  d 
  i 
  a 
  Dru. 
  1, 
  3, 
  'S, 
  three 
  stages 
  in 
  the 
  emerg- 
  

   ence 
  of 
  the 
  imago 
  from 
  the 
  old 
  nymph 
  skin 
  ^^leu 
  preserve 
  as 
  spccimcus, 
  being 
  

  

  always 
  careful 
  so 
  to 
  label 
  imago 
  and 
  nymph 
  skin 
  that 
  future 
  mixing 
  of 
  

   specimens 
  will 
  be 
  impossible. 
  

  

  The 
  two 
  suborders, 
  of 
  which 
  but 
  one 
  is 
  treated 
  in 
  this 
  paper, 
  may 
  be 
  

   readily 
  recognized 
  by 
  the 
  following 
  characters. 
  

  

  a 
  Fore 
  and 
  hind 
  wings 
  similar, 
  held 
  vertically 
  in 
  repose: 
  nymplis 
  with 
  three 
  

   large 
  leafiike 
  respiratory 
  plates 
  at 
  the 
  apex 
  of 
  the 
  slender 
  abdomen,- 
  and 
  

   with 
  the 
  body 
  tapering 
  posteriorly 
  from 
  the 
  head. 
  Suborder 
  ZYGOPTERA 
  : 
  

   damsel 
  files 
  

   aa 
  Fore 
  and 
  hind 
  wings 
  dissimilar, 
  the 
  latter 
  broader 
  at 
  the 
  base: 
  nymphs 
  

   without 
  external 
  respiratory 
  plates, 
  but 
  with 
  a 
  respiratory 
  chamber 
  in- 
  

   cluded 
  within 
  the 
  wide 
  abdomen 
  ; 
  body 
  less 
  slender, 
  and 
  not 
  widest 
  across 
  

   the 
  head. 
  Suborder 
  anisoptera 
  : 
  dragon 
  fiies 
  proper 
  

  

  Suborder 
  ANISOPTERA 
  

  

  The 
  dragon 
  fly 
  fauna 
  of 
  New 
  York 
  state 
  is 
  somewhat 
  more 
  extensive 
  

   than 
  that 
  of 
  the 
  few 
  other 
  states 
  in 
  which 
  careful 
  collecting 
  has 
  been 
  

   done. 
  Dr 
  P. 
  P. 
  Calvert 
  has 
  summarized 
  the 
  local 
  lists 
  of 
  the 
  dragon 
  flies 
  

   of 
  the 
  state 
  in 
  the 
  Journal 
  of 
  the 
  New 
  York 
  entomological 
  society,^ 
  giving 
  

  

  11895. 
  3 
  : 
  39-48 
  and 
  1897, 
  5 
  : 
  91-9 
  

  

  