﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  523 
  

  

  1895-97 
  Diplax 
  vicina 
  Calvert, 
  N. 
  Y. 
  ent. 
  soc. 
  Jour. 
  3 
  : 
  48 
  and 
  5 
  : 
  94 
  (listed 
  

   from 
  Lake 
  St 
  Regis, 
  Keeseville, 
  Dobbs 
  Ferry, 
  New 
  York, 
  Ithaca, 
  Cats- 
  

   kill 
  mountains, 
  Schoharie, 
  Piseco 
  lake 
  and 
  Buffalo) 
  

  

  1899 
  Diplax 
  vicina 
  Kellicott, 
  Odon. 
  Ohio, 
  p. 
  110 
  (description 
  aud 
  figure) 
  

  

  1900 
  Diplax 
  vicina 
  Williamson, 
  Dragon 
  flies 
  Ind. 
  p. 
  323 
  

  

  This 
  pretty, 
  little, 
  yellow-legged, 
  autumnal 
  species 
  is 
  likely 
  to 
  be 
  found 
  

   about 
  every 
  marsh-bordered 
  pond 
  in 
  the 
  state. 
  It 
  flits 
  about 
  the 
  shore 
  

   vegetation 
  and 
  is 
  not 
  at 
  all 
  difficult 
  to 
  capture 
  with 
  a 
  net. 
  At 
  Cascadilla 
  

   pond 
  near 
  Ithaca 
  I 
  have 
  watched 
  the 
  females 
  ovipositing 
  on 
  beds 
  of 
  wet 
  

   and 
  matted 
  dwarf 
  club-rush, 
  sometimes 
  alone, 
  but 
  oftener 
  held 
  by 
  the 
  

   male, 
  both 
  descending 
  together 
  and 
  rising 
  every 
  time 
  the 
  tip 
  of 
  the 
  ab- 
  

   domen 
  was 
  brushed 
  against 
  the 
  wet 
  mats. 
  Some 
  eggs 
  obtained 
  in 
  Sep- 
  

   tember 
  at 
  Ithaca 
  hatched 
  the 
  following 
  January, 
  having 
  been 
  kept 
  the 
  

   while 
  in 
  a 
  laboratory 
  of 
  the 
  normal 
  temperature. 
  Doubtless, 
  under 
  nor- 
  

   mal 
  conditions 
  they 
  do 
  not 
  hatch 
  before 
  spring. 
  

  

  Nymph. 
  Total 
  length 
  13 
  mm; 
  abdomen 
  8 
  mm; 
  hind 
  femur 
  4.5 
  

   mm; 
  width 
  of 
  head 
  4.5 
  mm, 
  of 
  abdomen 
  5 
  mm. 
  

  

  The 
  eyes 
  are 
  a 
  little 
  more 
  prominent 
  laterally 
  than 
  in 
  other 
  members 
  

   of 
  the 
  genus; 
  the 
  lateral 
  setae 
  are 
  nine; 
  mental 
  setae 
  about 
  12 
  or 
  13, 
  

   the 
  fifth 
  (counting 
  from 
  the 
  side) 
  longest; 
  the 
  movable 
  hook 
  is 
  exces- 
  

   sively 
  long 
  and 
  slender; 
  the 
  superior 
  appendage 
  is 
  one 
  third 
  shorter 
  than 
  

   the 
  inferiors, 
  and 
  the 
  laterals 
  less 
  than 
  one 
  half 
  as 
  long 
  as 
  the 
  inferiors. 
  

  

  At 
  Saranac 
  Inn, 
  the 
  nymphs 
  were 
  found 
  at 
  the 
  north 
  side 
  of 
  the 
  outlet 
  

   of 
  Little 
  Clear 
  pond, 
  on 
  the 
  shelving 
  bank 
  behind 
  the 
  hummock 
  of 
  cat- 
  

   tails. 
  They 
  are 
  rather 
  daintily 
  colored 
  with 
  bands 
  of 
  black 
  across 
  the 
  

   head, 
  including 
  the 
  eyes, 
  around 
  the 
  femora, 
  and 
  across 
  the 
  middle 
  of 
  

   the 
  abdominal 
  segments. 
  They 
  clamber 
  about 
  amid 
  the 
  semiaquatic 
  

   vegetation. 
  

  

  Sympetrum 
  semicinctum 
  Say 
  

  

  Figure 
  30 
  

  

  1839 
  L 
  i 
  bell 
  ul 
  a 
  semicincta 
  Say, 
  Acad. 
  nat. 
  sei. 
  Phil. 
  Jour. 
  8 
  : 
  27 
  

   1861 
  Diplax 
  semicincta 
  Hageu, 
  Synopsis 
  Neur. 
  N.Am. 
  p. 
  176 
  

   1893 
  Diplax 
  semicincta 
  Calvert, 
  Am. 
  ent. 
  soc. 
  Trans. 
  20:263 
  (descrip- 
  

   tion 
  and 
  figure) 
  

   1895 
  Diplax 
  semicincta 
  Calvert, 
  N. 
  Y. 
  ent. 
  soc. 
  Jour. 
  3:48 
  (listed 
  from 
  

   Ithaca, 
  Staten 
  Island, 
  Westchester 
  co.) 
  

  

  1899 
  Diplax 
  semicincta 
  Kellicott, 
  Odon. 
  Ohio, 
  p. 
  110 
  (description 
  and 
  

  

  figure) 
  

  

  1900 
  Sympetrum 
  semicinctum 
  Williamson, 
  Dragon 
  flies 
  Ind. 
  p. 
  324 
  

  

  (description 
  and 
  figure) 
  

  

  This 
  species, 
  which 
  I 
  have 
  observed 
  at 
  Ithaca, 
  and 
  have 
  bred 
  in 
  Illinois, 
  

   did 
  not 
  appear 
  at 
  Saranac 
  Inn. 
  It 
  is 
  quite 
  like 
  the 
  others 
  of 
  the 
  genus^ 
  

   I 
  have 
  observed 
  the 
  female 
  ovipositing 
  alone 
  in 
  muddy 
  pools 
  among 
  

   dead 
  smartweed 
  stems 
  on 
  a 
  mud 
  flat 
  beside 
  a 
  pond. 
  

  

  