﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  439 
  

  

  Ophiogomphus 
  carolus 
  Needham 
  

  

  Plate 
  20, 
  fig. 
  1-4, 
  6, 
  7 
  

   1897 
  Ophi 
  ogomphu 
  8 
  caroins 
  Needham, 
  Can. 
  ent. 
  29: 
  183, 
  pi. 
  7, 
  fig. 
  1, 
  2, 
  

  

  3, 
  4, 
  6, 
  7 
  

   1899 
  Ophiogomphus 
  carolus 
  Needham, 
  Can. 
  ent. 
  31 
  : 
  235-36, 
  pi. 
  5, 
  fig. 
  

  

  1 
  and 
  28 
  

  

  This 
  species, 
  abundant 
  at 
  Ithaca 
  N. 
  Y. 
  and 
  taken 
  at 
  several 
  other 
  

   places 
  in 
  the 
  state, 
  was 
  not 
  met 
  at 
  Saranac 
  Inn. 
  It 
  is 
  a 
  very 
  secre- 
  

   tive 
  species, 
  few 
  imagos 
  being 
  seen, 
  even 
  where 
  nymphs 
  are 
  excessively 
  

   abundant. 
  Like 
  the 
  preceding 
  species, 
  the 
  nymphs 
  prefer 
  the 
  sandy 
  

   beds 
  of 
  running 
  streams. 
  

  

  Nymph. 
  Total 
  length 
  26 
  mm; 
  abdomen 
  17 
  mm; 
  hind 
  femur 
  4.5 
  

   mm; 
  width 
  of 
  head 
  5 
  mm, 
  of 
  abdomen 
  7.5 
  mm. 
  

  

  Body 
  moderately 
  depressed, 
  widest 
  across 
  the 
  sixth 
  abdominal 
  seg- 
  

   ment, 
  suddenly 
  narrowed 
  on 
  the 
  ninth 
  segment. 
  All 
  ventrolateral 
  mar- 
  

   gins 
  closely 
  fringed 
  with 
  soft 
  hairs. 
  Color 
  yellowish, 
  the 
  surface 
  abund- 
  

   antly 
  sprinkled 
  with 
  brownish 
  granulations 
  visible 
  under 
  a 
  lens. 
  

  

  Abdomen 
  with 
  lateral 
  spines 
  on 
  segments 
  7-9, 
  a 
  little 
  increasing 
  in 
  

   length 
  posteriorly, 
  but 
  on 
  the 
  ninth 
  segment 
  distinctly 
  shorter 
  than 
  the 
  

   loth 
  segment. 
  Dorsal 
  hooks 
  on 
  these 
  same 
  segments 
  developed 
  as 
  small 
  

   blunt 
  posteriorly 
  directed 
  prominences, 
  which 
  hardly 
  surpass 
  the 
  narrow, 
  

   bare 
  apical 
  band 
  on 
  their 
  respective 
  segments, 
  longest 
  on 
  segment 
  9, 
  and 
  

   decreasing 
  in 
  size 
  anteriorly 
  so 
  as 
  to 
  be 
  barely 
  represented 
  on 
  segments 
  

  

  ^' 
  5' 
  4- 
  

  

  Labium 
  as 
  in 
  O. 
  aspersus, 
  but 
  with 
  the 
  12 
  to 
  16 
  teeth 
  on 
  the 
  

   inner 
  margin 
  of 
  the 
  lateral 
  lobe 
  a 
  Httle 
  longer 
  and 
  more 
  angulate 
  at 
  tips. 
  

  

  Easily 
  distinguished 
  from 
  the 
  nymph 
  of 
  O. 
  a 
  s 
  p 
  e 
  r 
  u 
  s 
  by 
  the 
  unequal 
  

   development 
  of 
  the 
  dorsal 
  hooks 
  on 
  the 
  abdominal 
  segments. 
  

  

  This 
  species 
  is 
  very 
  common 
  at 
  Ithaca 
  N. 
  Y. 
  Few 
  imagos 
  have 
  been 
  

   taken 
  at 
  large, 
  and, 
  indeed, 
  they 
  are 
  rarely 
  met 
  with 
  ; 
  but 
  the 
  nymphs 
  

   may 
  be 
  collected 
  by 
  hundreds 
  from 
  Six 
  Mile 
  creek 
  in 
  spring, 
  and 
  they 
  

   are 
  very 
  easily 
  reared. 
  

  

  Ophiogomphus 
  johannus 
  Needham 
  

  

  Plate 
  20, 
  fig. 
  5 
  

   1897 
  Ophiogomphus 
  j 
  o 
  h 
  a 
  u 
  n 
  u 
  s 
  Needham, 
  Can. 
  ent. 
  29 
  : 
  182, 
  pi. 
  7, 
  fig, 
  5 
  

   1899 
  Ophiogomphus 
  johannus 
  Needham, 
  Can. 
  ent. 
  31 
  : 
  235, 
  j)l. 
  5, 
  fig. 
  9, 
  

   18 
  and 
  27 
  

  

  The 
  type 
  of 
  this 
  species 
  in 
  the 
  Cornell 
  university 
  collection 
  is 
  from 
  

   Wilmurt 
  N. 
  Y., 
  and 
  was 
  collected 
  by 
  Prof 
  J. 
  H. 
  Comstock. 
  Since 
  

   describing 
  this 
  somewhat 
  immature 
  specimen, 
  I 
  have 
  seen 
  specimens 
  col- 
  

   lected 
  in 
  Maine 
  by 
  Prof. 
  Harvey, 
  and 
  in 
  western 
  Pennsylvania 
  by 
  Mr 
  

   WilHamson. 
  From 
  these 
  I 
  learn 
  that 
  the 
  terminal 
  abdominal 
  append- 
  

   ages 
  of 
  the 
  male 
  are 
  not 
  well 
  represented 
  in 
  the 
  figures 
  I 
  have 
  published. 
  ^ 
  

  

  1 
  Can. 
  ent. 
  1897. 
  29: 
  182, 
  pi. 
  7, 
  fig. 
  9, 
  18. 
  

  

  