﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  5 
  II 
  

  

  Nymph, 
  (fig. 
  29) 
  Fully 
  grown, 
  measures 
  in 
  total 
  length 
  of 
  body 
  

   10 
  mm; 
  abdomen 
  5.5 
  mm; 
  hind 
  femur 
  3.5 
  mm; 
  width 
  of 
  head 
  3,5 
  

   mm, 
  of 
  abdomen 
  4 
  mm. 
  

  

  Color 
  almost 
  uniform 
  tawny 
  yellowish 
  brown, 
  paler 
  below 
  and 
  on 
  the 
  

   sutures, 
  more 
  or 
  less 
  completely 
  obscured 
  by 
  adherent 
  vegetable 
  debris. 
  

   Body 
  moderately 
  hairy 
  on 
  lateral 
  margins, 
  specially 
  hairy 
  toward 
  the 
  

   end 
  of 
  the 
  abdomen. 
  

  

  Head 
  compact, 
  one 
  third 
  wider 
  than 
  long, 
  scurfy 
  hairy 
  above 
  excepting 
  

   a 
  pair 
  of 
  bare 
  spots 
  near 
  the 
  hind 
  margin, 
  with 
  prominent 
  hemispheric, 
  

   eyes 
  covering 
  the 
  anterolateral 
  angles, 
  narrower 
  behind 
  the 
  eyes 
  with 
  

   parallel 
  sides, 
  rounded 
  hind 
  angles, 
  and 
  almost 
  straight 
  hind 
  margin. 
  

  

  Antennae 
  shorter 
  than 
  the 
  head, 
  is 
  long, 
  seven-jointed, 
  with 
  scattering 
  

   hairs 
  along 
  the 
  distal 
  joints. 
  Labium 
  extending 
  posteriorly 
  between 
  the 
  

   bases 
  of 
  the 
  fore 
  legs 
  ; 
  median 
  lobe 
  broadly 
  triangular, 
  half 
  as 
  long 
  as 
  

   wide, 
  rounded 
  on 
  tip, 
  with 
  two 
  spinules 
  close 
  together 
  just 
  before 
  the 
  

   tip, 
  and 
  several 
  others 
  each 
  side 
  along 
  the 
  front 
  border 
  farther 
  apart; 
  

   raptorial 
  setae 
  on 
  the 
  mentum, 
  10 
  each 
  side, 
  the 
  fourth 
  or 
  fifth 
  (counting 
  

   from 
  the 
  side) 
  longest, 
  the 
  three 
  innermost 
  ones 
  quite 
  small; 
  lateral 
  

   labial 
  lobes 
  ample, 
  with 
  six 
  raptorial 
  setae, 
  and 
  a 
  spinule 
  at 
  the 
  base 
  ; 
  

   hook 
  straightish 
  to 
  the 
  slender 
  slightly 
  curved 
  tip, 
  hardly 
  longer 
  than 
  the 
  

   setae, 
  but 
  much 
  stouter 
  ; 
  teeth 
  almost 
  obsolete, 
  bispinulose. 
  

  

  Prothorax 
  with 
  prominent 
  spiracles; 
  legs 
  hairy, 
  specially 
  the 
  tibiae 
  

   externally; 
  tarsal 
  claws 
  not 
  strongly 
  incurved; 
  second 
  tarsal 
  joint 
  one 
  

   half 
  longer 
  than 
  the 
  first, 
  and 
  the 
  third 
  one 
  half 
  longer 
  than 
  the 
  second 
  ; 
  

   wings 
  reaching 
  well 
  on 
  the 
  sixth 
  abdominal 
  segment. 
  

  

  Abdomen 
  somewhat 
  depressed, 
  oblong, 
  widest 
  on 
  the 
  sixth 
  segment, 
  

   the 
  ninth 
  segment 
  as 
  wide 
  as 
  the 
  second 
  ; 
  nafrowed 
  with 
  extraordinary 
  

   abruptness 
  on 
  the 
  loth 
  segment, 
  which 
  is 
  almost 
  included 
  within 
  the 
  

   apex 
  of 
  the 
  ninth. 
  No 
  dorsal 
  hooks 
  at 
  all 
  ; 
  in 
  their 
  places 
  are 
  tufts 
  of 
  a 
  

   few 
  long 
  hairs, 
  and 
  whitish 
  spots 
  in 
  the 
  ante-apical 
  membrane 
  of 
  the 
  

   segments. 
  Lateral 
  spines 
  on 
  segments 
  8 
  and 
  9, 
  hooklike, 
  starting 
  

   outward 
  at 
  base, 
  and 
  incurved 
  at 
  tip, 
  on 
  eight 
  one 
  half 
  the 
  length 
  of 
  the 
  

   segment, 
  on 
  nine, 
  a 
  little 
  longer 
  than 
  on 
  eight. 
  Hairs 
  on 
  the 
  apical 
  

   carinae 
  well 
  developed, 
  specially 
  so 
  on 
  segment 
  nine, 
  which 
  they 
  com- 
  

   pletely 
  incircle, 
  constituting 
  a 
  long 
  fringe 
  which 
  completely 
  overhangs 
  

   the 
  loth 
  segment 
  and 
  the 
  appendages. 
  Appendages 
  about 
  as 
  long 
  as 
  

   the 
  ninth 
  segment 
  is 
  on 
  its 
  slightly 
  shorter 
  dorsal 
  side 
  ; 
  lateral 
  appendages 
  

   a 
  third 
  shorter. 
  

  

  Since 
  the 
  discovery 
  and 
  description' 
  of 
  the 
  nymyh 
  of 
  Tachopteryx 
  

   t 
  h 
  o 
  r 
  e 
  y 
  i 
  Selys 
  by 
  Messrs 
  Graf 
  and 
  Williamson, 
  last 
  year, 
  this 
  species 
  

   has 
  remained 
  the 
  most 
  important 
  discovery 
  to 
  be 
  made. 
  It 
  is 
  our 
  only 
  

   representative 
  of 
  that 
  singular 
  group 
  of 
  Libelluline 
  genera 
  which 
  Karsch 
  

   called 
  the 
  Nannophyae.^ 
  Mr 
  Weith's 
  zeal 
  and 
  industry 
  have 
  brought 
  

   this 
  nymph 
  to 
  light, 
  and 
  there 
  now 
  remains 
  of 
  all 
  the 
  genera 
  of 
  Odonata 
  

   of 
  the 
  northern 
  United 
  States 
  and 
  Canada 
  but 
  two 
  in 
  which 
  no 
  nymph 
  

   are 
  known, 
  and 
  they 
  are 
  Goraphaeschna 
  and 
  Micrathyria. 
  

  

  PERITHEMIS 
  

  

  There 
  is 
  a 
  single 
  species 
  occurring 
  within 
  the 
  state. 
  

  

  » 
  Eat. 
  Nachr. 
  15 
  : 
  245-63. 
  

  

  