﻿492 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  side 
  of 
  the 
  bay 
  in 
  Blueberry 
  island, 
  and 
  on 
  the 
  outside 
  of 
  the 
  cape 
  which 
  

   projects 
  across 
  the 
  outlet, 
  and 
  found 
  the 
  number 
  averaged 
  30 
  to 
  a 
  meter 
  

   in 
  distance 
  along 
  the 
  shore 
  line. 
  When 
  one 
  reflects 
  that 
  there 
  were 
  miles 
  

   of 
  favorable 
  shore 
  line 
  in 
  this 
  pond, 
  the 
  number 
  of 
  images 
  suggested 
  by 
  

   a 
  little 
  calculation 
  will 
  account 
  for 
  a 
  considerable 
  quantity 
  of 
  eggs. 
  

  

  2) 
  I 
  hatched 
  thousands 
  of 
  these 
  eggs. 
  While 
  the 
  nymphs 
  of 
  Libellu- 
  

   lidae, 
  when 
  new-hatched, 
  look 
  much 
  alike, 
  these 
  showed 
  corduline 
  char- 
  

   acters 
  quite 
  as 
  much 
  like 
  Tetragoneuria 
  as 
  any 
  other. 
  

  

  ^L<C^\ 
  

  

  Fig. 
  20 
  Lateral 
  and 
  dorsal 
  views 
  of 
  the 
  abdomen 
  of 
  the 
  nymph 
  of 
  Tetragoneuria 
  cynosura 
  

   Say. 
  a 
  Appendages 
  7i 
  dorsal 
  hooks 
  ; 
  s 
  lateral 
  spines 
  

  

  Of 
  the 
  three 
  species 
  found 
  at 
  Saranac 
  Inn 
  I 
  bred 
  two 
  species 
  of 
  the 
  

   nymphs, 
  and 
  found 
  other 
  nymph 
  skins 
  which 
  I 
  have 
  below 
  referred 
  by 
  sup- 
  

   position 
  to 
  the 
  other 
  species 
  (T 
  . 
  s 
  p 
  i 
  n 
  o 
  s 
  a). 
  The 
  recognition 
  charac- 
  

   ters 
  for 
  imagos 
  and 
  nymphs 
  of 
  the 
  four 
  species 
  of 
  the 
  state 
  are 
  given 
  

   below 
  in 
  tabular 
  form. 
  

  

  