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  Macrocephalidae 
  and 
  most 
  Geocoridae, 
  there 
  are 
  2 
  glands, 
  

   opening 
  onto 
  the 
  5th 
  and 
  6th 
  tergites; 
  in 
  a 
  few 
  Geocoridae, 
  

   however, 
  there 
  is 
  an 
  opening 
  also 
  on 
  the 
  foiirth. 
  In 
  the 
  

   Tingidae, 
  there 
  are 
  openings 
  on 
  the 
  fourth 
  and 
  fifth; 
  in 
  the 
  

   Acanthiidae 
  and 
  Miridae, 
  on 
  the 
  fourth 
  only. 
  

  

  So 
  far 
  as 
  is 
  known 
  — 
  but 
  the 
  knowledge 
  is 
  very 
  scanty 
  — 
  the 
  

   ova 
  of 
  Cimicidae, 
  Lygaeidae, 
  Pyrrhocoridae, 
  Geocoridae, 
  Tin- 
  

   gidae, 
  Anthocoridae, 
  Clinocoridae, 
  Eeduviidae, 
  Nepidae, 
  

   Belostomatidae, 
  Corixidae, 
  Poekillopteridae 
  and 
  Issidae 
  are 
  

   deposited 
  externally, 
  while 
  those 
  of 
  Naucoridae, 
  Notonectidae, 
  

   Cicadidae, 
  Cercopidae, 
  Tetigoniidae, 
  Membracidac, 
  Fulgoridae 
  

   and 
  Asiracidae 
  are 
  inserted 
  more 
  or 
  less 
  internally. 
  

  

  O. 
  M. 
  Eeuter 
  commenced 
  his 
  celebrated 
  "Hemiptera 
  

   Gymnocerata 
  Europae" 
  with 
  the 
  Miridae, 
  on 
  the 
  ground 
  that 
  

   these 
  appear 
  to 
  be 
  the 
  'lowest' 
  and 
  most 
  authors 
  seem 
  to 
  agree 
  

   with 
  him, 
  accepting 
  the 
  Cimicidae 
  as 
  the 
  'highest.' 
  On 
  the 
  

   contrary, 
  I 
  think 
  that 
  the 
  nymphal, 
  coxal 
  and 
  venational 
  char- 
  

   acters, 
  stamp 
  the 
  Cimicidae 
  as 
  the 
  most 
  primitive 
  of 
  existing 
  

   Hemiptera; 
  the 
  specialized 
  venation, 
  the 
  n^Tuphal 
  and 
  coxal 
  

   characters, 
  etc., 
  placing 
  the 
  Miridae 
  at 
  the 
  end 
  of 
  one 
  twig 
  of 
  

   the 
  second 
  main 
  branch 
  of 
  the 
  Pagiopod 
  series 
  of 
  Heteroptera, 
  

   the 
  Notonectidae 
  being 
  another 
  of 
  the 
  terminal 
  twigs 
  of 
  the 
  

   great 
  branch 
  from 
  which 
  the 
  Miridae 
  have 
  sprung. 
  ^ 
  

  

  Distant, 
  in 
  the 
  most 
  recently 
  promulgated 
  classification 
  of 
  

   the 
  families 
  of 
  the 
  Heteroptera, 
  separates 
  the 
  "Pentatomidae" 
  

   (i. 
  e. 
  Cimicidae) 
  from 
  all 
  the 
  other 
  families 
  (6) 
  by 
  the 
  

   character 
  of 
  the 
  scutellum 
  reaching 
  to 
  at 
  least 
  the 
  base 
  of 
  the 
  

   membrane. 
  As 
  a 
  matter 
  of 
  fact, 
  this 
  is 
  also 
  the 
  case 
  in 
  Aradi- 
  

   dae 
  and 
  some 
  Macrocephalidae, 
  so 
  that 
  Distant's 
  classification 
  

   breaks 
  down 
  at 
  the 
  start. 
  The 
  principal 
  divisions^ 
  of 
  

   ''Gymnocerata" 
  and 
  "Cryptocerata" 
  are 
  also 
  now 
  discredited. 
  

  

  The 
  following 
  is 
  an 
  attempt 
  to 
  group 
  the 
  Heteroptera 
  more 
  

   naturally. 
  I 
  have 
  dealt 
  with 
  the 
  Homoptera 
  elsewhere 
  C)- 
  

  

  PHALANX 
  1 
  TKOCHALOPODA. 
  

  

  SUPERFAMILY 
  1 
  CIMICOIDEA. 
  

  

  Families 
  Cimicidae, 
  Aradidae, 
  Lygaeidae, 
  Pyrrhocoridae, 
  Geo- 
  

   coridae 
  and 
  Tingidae. 
  

  

  (6) 
  After 
  excluding 
  the 
  aquatic 
  and 
  semiaquatic 
  families. 
  

   (7) 
  Bull. 
  Ent. 
  H. 
  S. 
  P. 
  A., 
  III. 
  (1907) 
  

  

  