﻿436 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  h 
  Wing 
  cases 
  strongly 
  divergent 
  on 
  the 
  two 
  sides 
  ; 
  lateral 
  lobe 
  of 
  labium 
  blunt 
  

  

  at 
  apex 
  Opbiogomphus 
  

  

  Ih 
  Wing 
  cases 
  laid 
  closely 
  parallel 
  along 
  the 
  back; 
  lateral 
  lobe 
  of 
  labium 
  

   ending 
  in 
  a 
  sharp, 
  incurved 
  hook 
  

   c 
  Abdomen 
  very 
  thin 
  and 
  flat, 
  circular 
  in 
  outline 
  as 
  seen 
  from 
  above; 
  third 
  

  

  segment 
  of 
  antenna 
  flat 
  and 
  subcireular 
  ...„ 
  Hagenius 
  

  

  cc 
  Abdomen 
  less 
  depressed, 
  ovate 
  to 
  lanceolate 
  in 
  outline, 
  at 
  least 
  tv^ice 
  as 
  

   long 
  as 
  wide 
  

   d 
  Third 
  joint 
  of 
  antenna 
  very 
  flat, 
  thin, 
  and 
  in 
  outline 
  circular 
  or 
  

  

  broadly 
  oval 
  , 
  Lanthus 
  

  

  dd 
  Third 
  joint 
  of 
  antenna 
  elongate, 
  linear, 
  little 
  flattened 
  

  

  e 
  Dorsum 
  of 
  the 
  ninth 
  abdominal 
  segment 
  rounded, 
  or 
  with 
  a 
  low, 
  obtuse^. 
  

  

  median 
  longitudinal 
  ridge 
  Gomphu 
  s, 
  sens, 
  lat, 
  

  

  ee 
  Ninth 
  abdominal 
  segment 
  with 
  a 
  sharp 
  middorsal 
  ridge, 
  ending 
  in 
  a 
  

   straight 
  apical 
  spine 
  Dromogomphua 
  

  

  The 
  genus 
  Progomphus 
  has 
  not 
  yet 
  been 
  found 
  in 
  New 
  York 
  

   state, 
  but 
  it 
  will 
  probably 
  be 
  eventually. 
  It 
  ranges 
  from 
  Massachusetts 
  

   southward 
  and 
  westward 
  across 
  the 
  continent, 
  a 
  single 
  P. 
  obscurus 
  

   Selys, 
  having 
  been 
  taken 
  in 
  the 
  whole 
  northeastern 
  United 
  States. 
  

  

  OPHIOGOMPHUS 
  

  

  Four 
  species 
  of 
  this 
  genus 
  are 
  known 
  from 
  Ncav 
  York 
  state. 
  A 
  fifths 
  

   O. 
  mainensis 
  Packard 
  is 
  in 
  our 
  lists, 
  but 
  erroneously, 
  I 
  believe. 
  

   The 
  specimens 
  on 
  which 
  the 
  record 
  is 
  based 
  are 
  in 
  the 
  I.intner 
  collec- 
  

   tion 
  and 
  in 
  the 
  museum 
  of 
  comparative 
  zoology. 
  I 
  have 
  examined 
  

   them 
  all, 
  and 
  they 
  certainly 
  belong 
  to 
  O. 
  carolus 
  Ndm., 
  which 
  I 
  

   believe 
  to 
  be 
  a 
  distinct 
  species. 
  The 
  error 
  seems 
  to 
  have 
  come 
  in 
  the 
  

   associating 
  of 
  males 
  ofO. 
  carolus 
  from 
  New 
  York 
  with 
  the 
  female 
  

   type 
  of 
  0» 
  m 
  a 
  i 
  n 
  e 
  n 
  s 
  i 
  s. 
  Our 
  four 
  species 
  may 
  be 
  separated 
  as 
  

   follows. 
  

  

  KEY 
  TO 
  THE 
  NEW 
  YORK 
  SPECIES 
  

  

  Imagos 
  

  

  a 
  Sides 
  of 
  the 
  middle 
  and 
  hind 
  femora 
  yellow 
  ; 
  the 
  inferior 
  abdominal 
  

   appendage 
  of 
  the 
  male 
  narrower 
  than 
  the 
  superiors, 
  not 
  visible 
  from 
  

   above 
  

   h 
  No 
  black 
  line 
  on 
  the 
  third 
  lateral 
  suture 
  (fig. 
  10) 
  of 
  the 
  thorax; 
  abdominal 
  

   segments 
  mostly 
  yellowish 
  or 
  brownish, 
  marked 
  with 
  black 
  apically 
  

  

  r 
  u 
  p 
  i 
  n 
  8 
  u 
  1 
  e 
  n 
  8 
  i 
  8 
  

   hi) 
  Third 
  lateral 
  suture 
  of 
  the 
  thorax 
  black, 
  middle 
  abdominal 
  segments 
  black 
  on 
  

  

  the 
  dorsal 
  side 
  _ 
  aspersus 
  

  

  aa 
  Sides 
  of 
  the 
  middle 
  and 
  hind 
  tarsi 
  black 
  ; 
  the 
  inferior, 
  abdominal 
  appendage 
  

  

  of 
  the 
  male 
  wider 
  than 
  the 
  superiors, 
  its 
  lateral 
  angles 
  visible 
  from 
  above 
  

  

  c 
  Forks 
  of 
  the 
  inferior 
  abdominal 
  appendage 
  of 
  the 
  male 
  apparently 
  again 
  

  

  forked, 
  the 
  apex 
  of 
  each 
  bearing 
  two 
  strong, 
  upcurved 
  teeth 
  separated 
  by 
  

  

  a 
  deep 
  rounded 
  notch 
  ^ 
  johannus 
  

  

  