﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  

  

  477 
  

  

  formed. 
  I 
  believe 
  that 
  the 
  season 
  for 
  their 
  transformation 
  was 
  past 
  and 
  

   that 
  the 
  period 
  of 
  adult 
  life 
  for 
  this 
  insect 
  is 
  a 
  long 
  one. 
  The 
  few 
  speci- 
  

   mens 
  captured 
  were 
  all 
  males. 
  

  

  Nymph. 
  Measures 
  in 
  total 
  

   length 
  41 
  mm 
  ; 
  abdomen 
  30 
  mm 
  ; 
  

   hind 
  femur 
  6 
  mm 
  ; 
  width 
  of 
  

   head 
  7 
  mm, 
  of 
  abdomen 
  8 
  mm. 
  

  

  Body 
  very 
  densely 
  rough 
  

   hairy; 
  colors 
  (entirely 
  obscured 
  

   except 
  after 
  molting) 
  yellowish 
  

   marked 
  with 
  brown 
  spots 
  ; 
  a 
  pair 
  

   of 
  these 
  at 
  the 
  base 
  of 
  the 
  fore 
  

   wings, 
  a 
  double 
  submedian 
  row 
  

   along 
  the 
  dorsum 
  of 
  the 
  abdo- 
  

   men, 
  oval, 
  with 
  apices 
  con- 
  

   vergent 
  in 
  each 
  pair: 
  external 
  

   to 
  these, 
  another 
  row 
  each 
  side 
  

   with 
  apices 
  divergent 
  ; 
  external 
  

   to 
  these, 
  a 
  less 
  conspicuous 
  row 
  

   each 
  side, 
  of 
  spots 
  lying 
  nearer 
  

   the 
  bases 
  of 
  the 
  segments 
  ; 
  supe- 
  

   rior 
  and 
  inferior 
  appendages 
  

   yellow, 
  black 
  tipped, 
  fringed 
  

   densely 
  on 
  their 
  internal 
  mar- 
  

   gins 
  with 
  soft 
  black 
  hairs 
  ; 
  laterals 
  

   one 
  fifth 
  as 
  long, 
  not 
  fringed. 
  

  

  Mentum 
  of 
  labium 
  bell-shaped 
  in 
  outline 
  (fig. 
  16); 
  median 
  lobe 
  very 
  

   long 
  and 
  dilated 
  on 
  the 
  cleft 
  apex 
  in 
  a 
  pair 
  of 
  flat 
  ovoid 
  lobes, 
  with 
  ser- 
  

   rulated 
  margins 
  and 
  each 
  with 
  an 
  external 
  apical 
  denticle 
  ; 
  lateral 
  lobe 
  

   with 
  10 
  or 
  II 
  very 
  unequal 
  sharp 
  teeth 
  on 
  distal 
  margin, 
  the 
  longest 
  of 
  the 
  

   teeth, 
  the 
  movable 
  hook 
  and 
  the 
  setae 
  of 
  about 
  equal 
  length, 
  the 
  hook 
  

   several 
  times 
  as 
  thick 
  as 
  the 
  setae; 
  setae 
  five; 
  setae 
  on 
  mentum 
  10 
  or 
  11, 
  

   six 
  or 
  seven 
  longer 
  ones 
  in 
  a 
  longitudinal 
  row 
  at 
  the 
  sides, 
  and 
  four 
  small 
  

   ones 
  extending 
  from 
  the 
  proximal 
  end 
  of 
  this 
  row 
  toward 
  the 
  median 
  line. 
  

  

  Abdomen 
  with 
  segments 
  about 
  equal 
  in 
  length 
  as 
  far 
  as 
  the 
  loth, 
  

   which 
  is 
  about 
  one 
  third 
  shorter; 
  appendages 
  equal 
  the 
  ninth 
  segment 
  in 
  

   length 
  ; 
  in 
  the 
  female 
  the 
  long 
  triangular 
  lobes 
  of 
  the 
  ovipositor 
  extend 
  

   to 
  the 
  apex 
  of 
  the 
  ninth 
  segment, 
  against 
  which 
  they 
  are 
  closely 
  applied 
  ; 
  

   lateral 
  spines, 
  minute 
  cylindric 
  pointed 
  rudiments, 
  hidden 
  among 
  the 
  

   hairs 
  of 
  the 
  lateral 
  margins, 
  on 
  the 
  eighth 
  and 
  ninth 
  segments. 
  

  

  Fig. 
  16 
  Labium 
  of 
  nymph 
  of 
  

   maculatus 
  Say, 
  supposition 
  

  

  C 
  o 
  r 
  d 
  u 
  1 
  e 
  g 
  a 
  s 
  t 
  e 
  r 
  

  

  Cordulegaster 
  diastatops 
  Selys 
  

  

  1854 
  Thecaphora 
  diastatops 
  Selys, 
  Acad. 
  Belg. 
  (2) 
  Bui. 
  21; 
  101 
  

  

  1886 
  Cordulegaster 
  lateralis 
  Scudder, 
  Bost. 
  soc. 
  nat. 
  hist. 
  Proc. 
  10: 
  211 
  

  

  1872 
  C 
  ordu 
  leg 
  aster 
  sayi 
  (nymph) 
  Cabot, 
  Mus. 
  compar. 
  zool. 
  Mem. 
  v. 
  2, 
  

  

  art. 
  5, 
  p. 
  13, 
  pi. 
  3, 
  fig. 
  2 
  

   1885 
  Cordulegaster 
  diastatops 
  (nymph, 
  supposition) 
  Hagen, 
  Am. 
  ent, 
  

  

  soc. 
  Trans. 
  12:290 
  (description) 
  

   1878 
  Thecaphora 
  diastatops 
  Selys, 
  Acad. 
  Belg. 
  Bui. 
  p. 
  685 
  (descrip- 
  

   tive 
  Qotos 
  and 
  corrections) 
  

   1895 
  Cordulegaster 
  diastatops 
  Calvert, 
  N. 
  Y. 
  ent. 
  soc. 
  Jour. 
  3:45 
  

   (listed 
  from 
  New 
  York 
  state) 
  

  

  