﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  483 
  

  

  a 
  low 
  median 
  ridge 
  representing 
  another 
  on 
  the 
  loth 
  segment, 
  often 
  little 
  

  

  evident. 
  The 
  lateral 
  spines, 
  which 
  occupy 
  the 
  sides 
  of 
  the 
  eighth 
  and 
  

  

  ninth 
  segments, 
  are 
  generally 
  stout 
  and 
  flattened, 
  and 
  do 
  not 
  reach 
  the 
  

  

  level 
  of 
  the 
  tips 
  of 
  the 
  appendages. 
  The 
  loth 
  abdominal 
  segment 
  is 
  a 
  

  

  little 
  shorter 
  than 
  the 
  ninth. 
  

  

  Imagos 
  

  

  a 
  Length 
  of 
  abdomen 
  generally 
  less 
  than 
  50 
  mm 
  ; 
  expanse 
  of 
  wing 
  less 
  tban 
  100 
  

  

  mm; 
  thoracic 
  dorsum 
  usually 
  without 
  yellow 
  stripes 
  illinoiensis 
  

  

  aa 
  Length 
  of 
  abdomen 
  about 
  60 
  mm 
  ; 
  expanse 
  of 
  wing 
  more 
  than 
  110 
  mm; 
  dor- 
  

   sum 
  of 
  the 
  thorax 
  with 
  a 
  pair 
  of 
  short, 
  yellow 
  stripes 
  taeniolata 
  

  

  Nymp/is 
  

  

  a 
  Lateral 
  spines 
  of 
  abdomen 
  directed 
  posteriorly, 
  hardly 
  incurved; 
  pyramidal 
  

  

  horn 
  on 
  the 
  front 
  of 
  the 
  head 
  acute 
  at 
  apex... 
  ill 
  inoiensis, 
  supposition 
  

  

  aa 
  Lateral 
  abdominal 
  spines 
  strongly 
  incurved 
  at 
  the 
  tip; 
  pyramidal 
  horn 
  on 
  

  

  the 
  front 
  of 
  the 
  head 
  obtuse, 
  hairy 
  taeniolata, 
  supposition 
  

  

  Macromia 
  illinoiensis 
  Walsh 
  

  

  1862 
  Macromia 
  illinoiensis 
  Walsh, 
  Acad. 
  nat. 
  sci. 
  Phil. 
  Proc. 
  p. 
  397 
  

  

  1893 
  Macromia 
  illinoiensis 
  Calvert, 
  Am. 
  ent. 
  soc. 
  Trans. 
  20 
  : 
  251 
  (de- 
  

   scription) 
  

  

  1897 
  Macromia 
  illinoiensis 
  Van 
  Duzee, 
  N. 
  Y. 
  ent. 
  soc. 
  Jour. 
  5:89 
  

   (listed 
  from 
  Grand 
  Island) 
  

  

  1899 
  Macromia 
  illinoiensis 
  Kellicott, 
  Odon. 
  Ohio, 
  p. 
  87 
  (description) 
  

  

  1900 
  Macromia 
  illinoiensis 
  Williamson, 
  Dragon 
  flies 
  Ind. 
  p. 
  308 
  

  

  (description) 
  

   1890 
  Macromia 
  illinoiensis 
  (nymph 
  supposition) 
  Cabot, 
  Immature 
  

   state 
  Odon. 
  3 
  : 
  16, 
  pi. 
  1, 
  fig. 
  2 
  and 
  pi. 
  2, 
  fig. 
  1 
  

  

  A 
  species 
  which 
  ranges 
  from 
  New 
  Hampshire 
  to 
  Texas. 
  Though 
  taken 
  

   but 
  once 
  as 
  yet 
  within 
  the 
  state, 
  it 
  probably 
  dwells 
  in 
  the 
  borders 
  of 
  a 
  

   number 
  of 
  our 
  larger 
  bodies 
  of 
  water. 
  I 
  have 
  not 
  seen 
  the 
  imago 
  at 
  

   large. 
  I 
  have 
  seen 
  a 
  few 
  of 
  the 
  nymphs 
  referred 
  to 
  this 
  species, 
  and 
  

   may 
  add 
  a 
  descriptive 
  note 
  covering 
  some 
  points 
  unnoticed 
  by 
  Cabot. 
  

  

  A 
  nymph 
  26 
  mm 
  long 
  has 
  a 
  length 
  of 
  abdomen 
  of 
  16 
  mm 
  ; 
  of 
  hind 
  

   femur 
  of 
  11 
  mm; 
  a 
  width 
  of 
  head 
  of 
  7.5 
  mm, 
  of 
  abdomen 
  of 
  11 
  mm. 
  

  

  Head 
  a 
  little 
  narrowed 
  behind 
  the 
  very 
  prominent 
  eyes 
  to 
  the 
  hind 
  

   angles, 
  above 
  each 
  of 
  which 
  is 
  a 
  little 
  superior 
  tubercle 
  ; 
  labium 
  greatly 
  

   widened 
  anteriorly, 
  and 
  concave, 
  forming 
  an 
  immense 
  mask; 
  lateral 
  

   setae 
  six, 
  with 
  two 
  little 
  axial 
  setae 
  at 
  the 
  base 
  of 
  the 
  lateral 
  lobe 
  within; 
  

   mental 
  setae 
  five 
  each 
  side, 
  close 
  together 
  in 
  row, 
  with 
  several 
  more 
  

   minute, 
  detached 
  ones 
  nearer 
  the 
  median 
  Hne 
  ; 
  teeth 
  about 
  five, 
  large, 
  

   oblique, 
  each 
  armed 
  with 
  about 
  four 
  or 
  five 
  spinules. 
  

  

  