﻿450 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Abdomen 
  black 
  with 
  a 
  middorsal 
  line 
  of 
  yellow 
  triangles 
  pointing 
  pos- 
  

   teriorly, 
  elongate 
  and 
  twice 
  constricted 
  on 
  the 
  basal 
  segments, 
  becoming, 
  

   very 
  short 
  and 
  restricted 
  to 
  the 
  base 
  on 
  several 
  segments 
  before 
  the 
  

   ninth, 
  and 
  entirely 
  absent 
  from 
  the 
  ninth 
  and 
  loth 
  segments. 
  There 
  is 
  a. 
  

   line 
  of 
  yellow 
  at 
  the 
  extreme 
  apex 
  of 
  some 
  of 
  the 
  terminal 
  segments 
  

   beyond 
  the 
  spiniferous, 
  apical, 
  transverse 
  carina; 
  the 
  nth 
  segment^ 
  

   "anal 
  tubercle," 
  of 
  the 
  female 
  yellow 
  except 
  at 
  the 
  sides; 
  appendages 
  

   black; 
  sides 
  of 
  segments 
  1-3 
  mainly 
  yellow; 
  segments 
  4-7 
  with 
  small 
  

   basal 
  lateral 
  yellow 
  spots 
  in 
  the 
  female; 
  the 
  slightly 
  expanded 
  lateral 
  

   margins 
  of 
  segments 
  8 
  and 
  9 
  yellow 
  in 
  both 
  sexes. 
  

  

  Described 
  from 
  a 
  $ 
  from 
  Saranac 
  Inn 
  taken 
  July 
  2, 
  1900, 
  and 
  from 
  a 
  

   $ 
  collected 
  on 
  Mt 
  Tom 
  in 
  Massachusetts 
  ; 
  the 
  larger 
  measm-ements 
  are 
  

   for 
  the 
  female 
  specimen. 
  

  

  This 
  Saranac 
  Inn 
  female 
  was 
  the 
  first 
  imago 
  seen 
  there, 
  and 
  it 
  will 
  be 
  

   noted 
  that 
  the 
  date 
  is 
  two 
  weeks 
  after 
  the 
  nymphs 
  had 
  ceased 
  emerging, 
  

   I 
  think 
  this 
  time 
  represents 
  the 
  period 
  necessary 
  for 
  the 
  maturation 
  of 
  

   the 
  eggs 
  after 
  transformation. 
  A 
  similar 
  lapse 
  of 
  time 
  between 
  the 
  period 
  

   of 
  transformation 
  and 
  that 
  of 
  oviposition 
  was 
  observed 
  in 
  the 
  case 
  of 
  a 
  

   number 
  of 
  other 
  gomphines. 
  I 
  beheve 
  these 
  insects 
  live 
  longer 
  as 
  

   imagos 
  than 
  is 
  commonly 
  supposed. 
  As 
  is 
  well 
  known, 
  they 
  will 
  die 
  

   within 
  a 
  week 
  after 
  transformation 
  if 
  kept 
  in 
  confinement, 
  but 
  apparently 
  

   no 
  one 
  has 
  tried 
  feeding 
  them 
  well 
  while 
  keeping 
  them 
  as 
  yet. 
  May 
  

   they 
  not 
  die 
  of 
  starvation 
  ? 
  

  

  Nymph. 
  PI. 
  18, 
  fig. 
  3. 
  Total 
  length 
  26 
  mm 
  ; 
  abdomen 
  17 
  mm; 
  hind 
  

   femur 
  5 
  mm 
  ; 
  width 
  of 
  head 
  5 
  mm, 
  of 
  abdomen 
  6.5 
  mm. 
  

  

  Body 
  depressed, 
  abdomen 
  with 
  sides 
  parallel 
  to 
  the 
  eighth 
  segment, 
  

   then 
  rather 
  abruptly 
  narrowed 
  to 
  an 
  obtuse 
  point; 
  lateral 
  spines 
  on 
  seg- 
  

   ments 
  6-9, 
  the 
  margins 
  which 
  bear 
  them 
  thin, 
  and 
  on 
  the 
  ninth 
  segment 
  

   finely 
  spinulose 
  serrate 
  ; 
  spines 
  of 
  the 
  ninth 
  segment 
  about 
  as 
  long 
  as 
  the 
  

   loth 
  segment; 
  very 
  minute 
  rudiments 
  of 
  dorsal 
  hooks 
  on 
  segments 
  8 
  and 
  

   9; 
  before 
  the 
  eighth 
  segment 
  there 
  is 
  an 
  observable 
  trace 
  of 
  the 
  median 
  

   impressed 
  longitudinal 
  line 
  of 
  the 
  typical 
  Gomphus 
  nymph. 
  The 
  

   loth 
  segment 
  is 
  about 
  one 
  third 
  the 
  length 
  of 
  the 
  ninth. 
  

  

  The 
  mentum 
  of 
  the 
  labium 
  is 
  rather 
  short, 
  little 
  longer 
  than 
  broad; 
  the 
  

   lateral 
  lobe 
  is 
  very 
  moderately 
  arcuate, 
  its 
  apex 
  forming 
  a 
  short 
  end 
  hook 
  

   not 
  greatly 
  differentiated 
  from 
  the 
  teeth 
  before 
  it; 
  of 
  these 
  teeth 
  on 
  the 
  

   inner 
  margm 
  of 
  the 
  lateral 
  lobe 
  there 
  are 
  eight 
  or 
  nine, 
  unequal, 
  the 
  mid- 
  

   dle 
  ones 
  being 
  slightly 
  largest, 
  angulate, 
  sharp, 
  the 
  line 
  of 
  their 
  apices 
  

   being 
  convex 
  internally, 
  rather 
  than 
  concave, 
  as 
  in 
  all 
  the 
  following 
  

   members 
  of 
  the 
  genus. 
  

  

  The 
  color, 
  usually 
  obscured 
  by 
  dirt 
  excepting 
  after 
  molting, 
  is 
  greenish 
  

   brown, 
  with 
  darker 
  motthngs 
  arranged 
  in 
  transverse 
  bands 
  on 
  abdominal 
  

   segments, 
  scars 
  on 
  abdomeii 
  surrounded 
  with 
  paler 
  color. 
  

  

  The 
  third 
  antennal 
  segment 
  is 
  hnear, 
  a 
  little 
  depressed 
  and 
  widened 
  

   apically, 
  hairy, 
  as 
  is 
  usual, 
  on 
  the 
  margins. 
  

  

  