﻿482 
  • 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  mottlings 
  darker 
  toward 
  the 
  middle 
  line, 
  and 
  on 
  the 
  lateral 
  ridges 
  of 
  the 
  

   thorax; 
  a 
  darker 
  band 
  covering 
  the 
  top 
  of 
  the 
  head, 
  including 
  the 
  eyes^ 
  

   but 
  not 
  the 
  frontal 
  horn, 
  which 
  is 
  yellowish, 
  sprinkled 
  on 
  its 
  upper 
  side 
  

   with 
  brownish 
  prickly 
  granulations. 
  

  

  Head 
  compact, 
  bulging 
  behind 
  the 
  eyes, 
  which 
  cap 
  the 
  elevated 
  

   anterolateral 
  angles; 
  antenna 
  with 
  the 
  basal 
  segment 
  twice 
  as 
  long 
  as 
  

   the 
  second, 
  about 
  as 
  long 
  as 
  the 
  third; 
  the 
  succeeding 
  segments 
  gradu- 
  

   ally 
  becoming 
  a 
  little 
  shorter; 
  hind 
  angles 
  of 
  the 
  head 
  obtuse 
  angled 
  

   superiorly 
  ; 
  rear 
  of 
  head 
  a 
  Httle 
  concave; 
  prothorax 
  with 
  a 
  flat, 
  angular 
  

   fringed 
  process 
  each 
  side, 
  fitted 
  snugly 
  against 
  the 
  sides 
  of 
  the 
  head 
  ; 
  

   tarsi 
  with 
  the 
  second 
  and 
  third 
  joints 
  of 
  about 
  equal 
  length, 
  the 
  first 
  joint 
  

   about 
  one 
  third 
  as 
  long; 
  femora 
  and 
  tibiae 
  ringed 
  obscurely 
  with 
  brown; 
  

   wing 
  cases 
  reaching 
  almost 
  to 
  the 
  apex 
  of 
  the 
  sixth 
  abdominal 
  segment. 
  

  

  Abdomen 
  flat, 
  with 
  thin, 
  flat 
  lateral 
  margins, 
  and 
  a 
  median 
  row 
  of 
  

   large, 
  cultriform, 
  dorsal 
  hooks 
  on 
  segments 
  3-9, 
  these 
  same 
  segments 
  

   longer 
  at 
  the 
  sides 
  than 
  on 
  the 
  median 
  Hne; 
  long, 
  straight, 
  lateral 
  spines 
  

   on 
  segments 
  8 
  and 
  9, 
  on 
  8 
  slightly 
  divergent, 
  on 
  9 
  parallel, 
  as 
  long 
  as 
  or 
  

   longer 
  than 
  the 
  body 
  of 
  the 
  segment 
  ; 
  loth 
  segment 
  annular, 
  inserted 
  into 
  

   an 
  apical 
  excavation 
  of 
  the 
  ninth, 
  one 
  third 
  as 
  long 
  as 
  the 
  length 
  of 
  the 
  

   ninth 
  on 
  its 
  middorsal 
  line; 
  appendages 
  about 
  as 
  long 
  as 
  9 
  above^ 
  

   subequal, 
  or 
  the 
  laterals 
  a 
  very 
  little 
  shorter. 
  Thorax 
  broadly 
  excavate 
  

   below 
  for 
  the 
  reception 
  of 
  the 
  labium, 
  with 
  a 
  pair 
  of 
  supporting 
  humps 
  

   beside 
  it 
  on 
  the 
  mesothorax 
  and 
  another 
  one 
  behind 
  it 
  on 
  the 
  metathorax. 
  

  

  Labium 
  large; 
  mentum 
  broadly 
  triangular, 
  strongly 
  contracted 
  at 
  its 
  

   basal 
  fourth, 
  with 
  a 
  moderately 
  prominent 
  and 
  declined 
  median 
  lobe, 
  

   and 
  about 
  seven 
  raptorial 
  setae 
  each 
  side, 
  the 
  two 
  inner 
  ones 
  quite 
  

   small 
  ; 
  lateral 
  lobe 
  ample, 
  concave, 
  with 
  five 
  raptorial 
  setae 
  and 
  a 
  hook 
  ^ 
  

   that 
  is 
  stouter 
  but 
  little 
  longer 
  than 
  the 
  setae 
  ; 
  distal 
  margin 
  with 
  about 
  six 
  

   or 
  seven 
  crenate 
  oval 
  teeth, 
  each 
  bearing 
  several 
  graduated 
  spinules. 
  

  

  MACROMIA 
  

  

  Two 
  species 
  are 
  regional, 
  but 
  only 
  one 
  of 
  them 
  has 
  as 
  yet 
  been 
  taken 
  

   within 
  the 
  state 
  (M 
  . 
  i 
  1 
  1 
  i 
  n 
  o 
  i 
  e 
  n 
  s 
  i 
  s) 
  ; 
  the 
  other 
  (M 
  . 
  t 
  a 
  e 
  n 
  i 
  o 
  1 
  a 
  t 
  a) 
  is 
  

   found 
  from 
  Pennsylvania 
  southward 
  as 
  far 
  as 
  Florida. 
  Neither 
  has 
  as 
  

   yet 
  been 
  bred. 
  Cabot 
  ^ 
  has 
  described 
  nymphs 
  referred 
  by 
  supposition 
  to 
  

   each. 
  Till 
  these 
  are 
  reared 
  it 
  is 
  hardly 
  worth 
  while 
  to 
  repeat 
  descrip- 
  

   tions 
  in 
  detail. 
  It 
  will 
  suffice 
  to 
  give 
  a 
  general 
  account 
  of 
  the 
  characters 
  

   of 
  nymphs 
  of 
  this 
  genus, 
  and 
  to 
  state 
  in 
  tabular 
  form 
  the 
  chief 
  differences 
  

   between 
  the 
  two 
  species 
  of 
  nymphs 
  believed 
  to 
  be 
  the 
  two 
  species 
  named. 
  

  

  The 
  nymphs 
  of 
  the 
  genus 
  are 
  short 
  and 
  flat, 
  with 
  widely 
  sprawling 
  

   legs. 
  The 
  shape 
  of 
  the 
  prominent 
  eyes, 
  elevated 
  on 
  the 
  laterosuperior 
  

   angles 
  of 
  the 
  head, 
  and 
  of 
  the 
  frontal 
  horn, 
  offer 
  specific 
  characters 
  : 
  the 
  

   head 
  is 
  widest 
  across 
  the 
  eyes, 
  and 
  slowly 
  narrowed 
  behind 
  them, 
  to 
  the 
  

   obtuse 
  hind 
  angles, 
  each 
  of 
  which 
  bears 
  a 
  tubercle 
  on 
  its 
  upper 
  aspect. 
  

   The 
  wings 
  reach 
  well 
  over 
  the 
  sixth 
  abdominal 
  segment. 
  There 
  are 
  

   strong 
  cultriform, 
  dorsal 
  hooks 
  on 
  abdominal 
  segments 
  2-9, 
  and 
  there 
  is 
  

  

  1 
  Immature 
  state 
  of 
  the 
  Odonata. 
  1890. 
  pt 
  3. 
  

  

  