﻿45^ 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  places 
  piled 
  several 
  layers 
  deep 
  with 
  the 
  exuviae 
  of 
  this 
  species, 
  inter- 
  

   mixed 
  with 
  a 
  lesser 
  number 
  of 
  G. 
  s 
  p 
  i 
  c 
  a 
  t 
  u 
  s 
  skins. 
  

  

  Nymph. 
  Total 
  length 
  26 
  mm; 
  abdomen 
  18 
  mm; 
  hind 
  femur 
  5.5 
  

   mm 
  ; 
  width 
  of 
  head 
  5 
  mm, 
  of 
  abdomen 
  6 
  mm. 
  

  

  Abdomen 
  depressed, 
  lanceolate, 
  regularly 
  narrowed 
  beyond 
  the 
  sixth 
  

   segment 
  to 
  a 
  rather 
  pointed 
  apex; 
  the 
  loth 
  segment 
  two 
  thirds 
  as 
  long 
  

   as 
  the 
  eighth, 
  a 
  little 
  less 
  than 
  half 
  as 
  long 
  as 
  the 
  ninth; 
  lateral 
  spines 
  on 
  

   segments 
  6-9, 
  very 
  minute, 
  specially 
  on 
  segment 
  6, 
  increasing 
  in 
  size 
  

   posteriorly, 
  on 
  segment 
  9 
  one 
  half 
  as 
  long 
  as 
  segment 
  10 
  : 
  dorsal 
  hooks 
  

   low 
  and 
  obscure, 
  but 
  pointed 
  on 
  sixth 
  to 
  ninth 
  segments. 
  

  

  Labium 
  with 
  its 
  median 
  lobe 
  a 
  very 
  little 
  convex 
  on 
  the 
  front 
  margin, 
  

   and 
  sometimes 
  with 
  an 
  imperfect 
  median 
  tooth; 
  lateral 
  lobe 
  considera- 
  

   bly 
  arcuate, 
  with 
  a 
  strong 
  end 
  hook, 
  and 
  with 
  4-7 
  very 
  variable 
  teeth 
  on 
  

   its 
  inner 
  margin, 
  each 
  tooth 
  obliquely 
  truncate, 
  with 
  the 
  longer 
  angle 
  

   directed 
  to 
  the 
  rear. 
  

  

  This 
  species 
  and 
  G. 
  sordidus, 
  offer 
  an 
  easy 
  transition 
  to 
  the 
  

   Arigomphus 
  group, 
  below. 
  

  

  Gomphus 
  ventricosus 
  Walsh 
  

  

  1863 
  Gomphus 
  ventricosus 
  Walsh, 
  Ent. 
  soc. 
  Phil. 
  Proc. 
  2 
  : 
  249 
  

  

  1875 
  Gomphus 
  ventricosus 
  Hagen, 
  Bost. 
  soc. 
  nat. 
  hist. 
  Proc. 
  18:47 
  

  

  (listed) 
  

   1900 
  Gomphus 
  ventricosus 
  Wiliiamsou, 
  Dragon 
  flies 
  lud. 
  p. 
  287 
  (de- 
  

   scription 
  and 
  figure) 
  

  

  This 
  apparently 
  rare 
  species 
  has 
  not 
  yet 
  been 
  taken 
  in 
  New 
  York. 
  I 
  

   include 
  it 
  in 
  this 
  Hst 
  because 
  of 
  its 
  occurrence 
  in 
  Illinois 
  and 
  Massachu- 
  

   setts; 
  it 
  will 
  doubtless 
  yet 
  be 
  found 
  within 
  the 
  state. 
  Its 
  nymph 
  is 
  

   unknown. 
  

  

  Gomphus 
  amnicola 
  Walsh 
  

  

  1862 
  Gomplius 
  amnicola 
  Walsh, 
  Acad. 
  nat. 
  sci. 
  Phil. 
  Proc. 
  p. 
  396 
  

  

  1863 
  Gomplius 
  amnicola 
  Walsh, 
  Ent. 
  soc. 
  Phil. 
  Proc. 
  2 
  : 
  256 
  (note) 
  

  

  1897 
  Gomphus 
  amnicola 
  Calvert, 
  N. 
  Y. 
  ent. 
  soc. 
  Jour. 
  5 
  : 
  95 
  (listed 
  from 
  

  

  Bethlehem 
  N. 
  Y.) 
  

   1900 
  Gomphus 
  amnicola 
  Williamson, 
  Dragon 
  flies 
  Ind. 
  p, 
  294 
  (descrip- 
  

   tion 
  and 
  figure) 
  

  

  Another 
  species 
  which 
  is 
  apparently 
  rare, 
  once 
  collected 
  within 
  the 
  

   state 
  by 
  Dr 
  Lintner 
  at 
  Bethlehem. 
  The 
  nymph 
  is 
  unknown. 
  

  

  Gomphus 
  scudderi 
  Selys 
  

  

  1878 
  Gomphus 
  scudderi 
  Selys, 
  Acad. 
  Belg. 
  (2) 
  Bui. 
  46 
  : 
  460 
  $ 
  

  

  1898 
  Gomphus 
  scudderi 
  Harvey, 
  Eut. 
  news, 
  9 
  : 
  62-63 
  ^ 
  (description 
  

  

  and 
  figures) 
  

   This 
  handsome 
  black 
  species 
  (pi. 
  17, 
  fig. 
  2), 
  unique 
  in 
  the 
  yellow 
  

   basal 
  rings 
  on 
  its 
  abdominal 
  segments, 
  has 
  not 
  been 
  reported 
  hitherto 
  

  

  