﻿448 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  the 
  female 
  armed 
  with 
  numerous 
  stout 
  spines 
  below; 
  posterior 
  hamule 
  

   of 
  male 
  directed 
  posteriorly. 
  

  

  Nymph. 
  Abdomen 
  wider 
  than 
  the 
  head 
  ; 
  flattened, 
  lanceolate 
  pointed, 
  

   suddenly 
  narrowed 
  on 
  the 
  ninth 
  segment, 
  which 
  is 
  longer 
  than 
  its 
  apical 
  

   width; 
  no 
  impressed 
  middorsal 
  line, 
  instead, 
  a 
  ridge 
  without 
  distinct 
  

   dorsal 
  hooks; 
  lateral 
  spines 
  on 
  segments 
  7-9 
  or 
  8-9, 
  none 
  on 
  segment 
  6; 
  

   median 
  lobe 
  of 
  labium 
  prominently 
  rounded 
  or 
  dome 
  shaped, 
  and 
  usually 
  

   bearing, 
  besides 
  the 
  usual 
  brush 
  of 
  flattened 
  hairs, 
  a 
  median 
  tooth. 
  

  

  KEY 
  

   a) 
  Imago 
  with 
  abdominal 
  appendages 
  black 
  ; 
  superiors 
  of 
  male 
  with 
  an 
  in- 
  

   ferior 
  tooth 
  ; 
  nymph 
  with 
  bare 
  median 
  narrow 
  ridge 
  on 
  the 
  abdomen; 
  

  

  lateral 
  spines 
  on 
  segments 
  7-9 
  G-. 
  spicatus 
  

  

  aa) 
  Imago 
  with 
  a 
  tooth 
  in 
  the 
  middle 
  of 
  the 
  occipital 
  border. 
  Abdominal 
  

   appendages 
  yellowish, 
  no 
  inferior 
  tooth 
  on 
  the 
  male 
  superiors. 
  Nymph 
  

   with 
  an 
  obtuse 
  scurfy 
  or 
  rough 
  pubesi-ent 
  middorsal 
  ridge 
  on 
  the 
  abdo- 
  

   men 
  ; 
  lateral 
  spines 
  on 
  segments 
  7-9 
  G. 
  villosipes 
  

  

  aaa) 
  Imago 
  with 
  no 
  tooth 
  in 
  middle 
  of 
  hind 
  border 
  of 
  the 
  occiput; 
  abdominal 
  

   appendages 
  yellow 
  ; 
  male 
  superior 
  appendages 
  apparently 
  bifurcated 
  at 
  

   apex; 
  rtymph 
  unkaosxn 
  , 
  Gr. 
  fnrcifer 
  

  

  Gomphus 
  abbreviatus 
  Selys 
  

  

  1878 
  Gomphns 
  abbreviatus 
  Selys, 
  Acad. 
  Belg. 
  (2) 
  Bui. 
  46 
  : 
  464 
  (original 
  

  

  description) 
  

   1890 
  Aeshna 
  abbreviata 
  Kirby, 
  Cat. 
  Neur. 
  Odon. 
  p. 
  66 
  (bibliography) 
  

  

  1892 
  Gomphus 
  abbreviatus 
  Banks, 
  Am. 
  ent. 
  soc. 
  Trans. 
  19 
  : 
  351 
  (bibli- 
  

  

  ography) 
  

  

  1893 
  Gomphus 
  abbreviatus 
  Calvert, 
  Am. 
  ent. 
  soc. 
  Trans. 
  20:243 
  (de- 
  

  

  scription) 
  

   This 
  species 
  is 
  not 
  recorded 
  from 
  New 
  York 
  state. 
  In 
  June 
  of 
  1897 
  I 
  

   found 
  some 
  nymphs 
  at 
  Ithaca 
  N. 
  Y. 
  in 
  Fall 
  creek 
  opposite 
  the 
  Cornell 
  

   insectary, 
  and 
  bred 
  a 
  few 
  of 
  them. 
  The 
  images 
  I 
  did 
  not 
  observe 
  at 
  

   large. 
  Nothing 
  has 
  been 
  written 
  as 
  to 
  their 
  habits. 
  The 
  species 
  appears 
  

   to 
  be 
  distributed 
  through 
  the 
  northeastern 
  states 
  as 
  far 
  south 
  as 
  Penn- 
  

   sylvania. 
  It 
  was 
  not 
  found 
  at 
  Saranac 
  Inn. 
  

  

  Nymph. 
  Measures 
  in 
  length 
  23-24 
  mm; 
  abdomen 
  14 
  mm; 
  hind 
  

   femur 
  5 
  mm; 
  width 
  of 
  head 
  5 
  mm, 
  of 
  abdomen 
  6.5 
  mm. 
  It 
  differs 
  from 
  

   G. 
  b 
  r 
  e 
  v 
  i 
  s 
  nymph 
  only 
  in 
  size 
  and 
  in 
  the 
  relative 
  length 
  of 
  the 
  foremost 
  

   lateral 
  spines 
  on 
  the 
  abdomen, 
  characters 
  already 
  stated 
  in 
  the 
  table; 
  

   there 
  is 
  no 
  need, 
  therefore, 
  of 
  a 
  separate 
  description 
  of 
  it, 
  since 
  G. 
  

   brevis 
  is 
  described 
  in 
  full 
  below, 
  and 
  the 
  description 
  would 
  be 
  but 
  

   repetition 
  of 
  the 
  characters 
  stated 
  for 
  that 
  species. 
  I 
  will 
  therefore 
  add 
  

   but 
  a 
  note 
  as 
  to 
  the 
  differences 
  of 
  the 
  situations 
  in 
  which 
  I 
  found 
  the 
  two 
  

   nymphs 
  : 
  abbreviatus 
  in 
  the 
  rocky 
  basins 
  of 
  a 
  gorge 
  traversed 
  by 
  a 
  

   foaming 
  creek, 
  destitute 
  of 
  the 
  commoner 
  large 
  aquatic 
  plants 
  ; 
  brevis, 
  

   in 
  the 
  bed 
  of 
  a 
  reed-choked, 
  slow 
  flowing, 
  upland 
  stream. 
  

  

  