﻿100 
  Dr. 
  G. 
  C. 
  Crampton's 
  Notes 
  on 
  the 
  Ancestry 
  of 
  the 
  

  

  related 
  to 
  the 
  Psocidae, 
  and 
  to 
  the 
  Hemiptera 
  (with 
  the 
  

   Homoptera). 
  They 
  have 
  Hkewise 
  carried, 
  over 
  in 
  their 
  

   hne 
  of 
  development 
  some 
  of 
  the 
  characters 
  occurring 
  in 
  

   certain 
  representatives 
  of 
  the 
  saltatorial 
  Orthoptera, 
  and 
  

   in 
  the 
  Forficuhd 
  representatives 
  of 
  the 
  Plecopteroid 
  

   superorder. 
  We 
  thus 
  have 
  another 
  threefold 
  resemblance 
  

   which 
  makes 
  it 
  rather 
  difficult 
  to 
  determine 
  the 
  closest 
  

   affinities 
  of 
  the 
  insects 
  in 
  question; 
  but 
  the 
  generally 
  

   accepted 
  opinion 
  that 
  the 
  Thysanoptera 
  are 
  rather 
  closely 
  

   related 
  to 
  the 
  Hemiptera 
  [sensu 
  lato) 
  appears 
  to 
  be 
  well 
  

   founded. 
  Boerner, 
  1904 
  (Zool. 
  Anzeiger, 
  Bd. 
  28, 
  p. 
  511), 
  

   has 
  pointed 
  out 
  the 
  resemblance 
  of 
  the 
  parts 
  of 
  the 
  head 
  of 
  

   Thysanoptera 
  to 
  those 
  of 
  Psocidae 
  and 
  Hemiptera 
  {sensu 
  

   lato), 
  and 
  the 
  evidence 
  furnished 
  by 
  a 
  study 
  of 
  the 
  head 
  

   region 
  is 
  borne 
  out 
  by 
  that 
  of 
  other 
  parts 
  of 
  the 
  body 
  as 
  

   well. 
  On 
  the 
  other 
  hand, 
  Hood, 
  1915 
  (Proc. 
  Biol. 
  Soc. 
  

   Washington, 
  28, 
  p. 
  53), 
  regards 
  the 
  Thysanoptera 
  as 
  

   " 
  Orthopteroid 
  " 
  insects, 
  following 
  Handhrsch, 
  1909 
  (Die 
  

   fossilen 
  Insekten), 
  who 
  derives 
  both 
  Thysanoptera 
  and 
  

   Dermaptera 
  from 
  forms 
  related 
  to 
  the 
  saltatorial 
  Orthoptera 
  

   such 
  as 
  the 
  " 
  Locustids 
  " 
  and 
  Grylhds. 
  According 
  to 
  

   Hinds, 
  1902 
  (Proc. 
  U.S. 
  Nat. 
  Museum, 
  vol. 
  26, 
  p. 
  79), 
  

   " 
  about 
  1828, 
  through 
  the 
  anatomical 
  studies 
  of 
  Straus- 
  

   Duerckheim 
  and 
  Latreille, 
  sufficient 
  evidence 
  was 
  obtained 
  

   to 
  lead 
  Latreille 
  to 
  separate 
  the 
  Thysanoptera 
  from 
  the 
  

   Hemiptera 
  and 
  place 
  them 
  among 
  the 
  Orthoptera," 
  and 
  

   Jordan, 
  1888 
  (Zeit. 
  Wiss. 
  Zool., 
  Bd. 
  xlvii, 
  p. 
  541), 
  

   thought 
  that 
  the 
  Thysanoptera 
  should 
  be 
  classed 
  " 
  accord- 
  

   ing 
  to 
  their 
  immersed 
  germ 
  band 
  and 
  their 
  larval 
  form 
  in 
  

   the 
  hne 
  of 
  the 
  Orthoptera, 
  Homoptera, 
  Hemiptera, 
  wherein 
  

   they 
  should 
  be 
  placed 
  according 
  to 
  their 
  anatomy 
  and 
  

   biology." 
  Jordan 
  also 
  states 
  that 
  "if 
  we 
  collect 
  the 
  

   Mallophaga, 
  Psocidae 
  and 
  Termitidae 
  as 
  Corrodentia 
  with 
  

   Brauer, 
  then 
  we 
  must 
  place 
  Thysanoptera 
  in 
  the 
  system 
  

   between 
  Corrodentia 
  and 
  Hemiptera 
  " 
  {teste 
  Hinds, 
  1902), 
  

   and 
  in 
  this 
  respect 
  his 
  views 
  are 
  not 
  essentially 
  different 
  

   from 
  those 
  here 
  given. 
  According 
  to 
  Jordan, 
  some 
  of 
  his 
  

   predecessors 
  have 
  regarded 
  the 
  Thysanoptera 
  as 
  related 
  to 
  

   the 
  Odonata, 
  but 
  there 
  does 
  not 
  seem 
  to 
  be 
  much 
  evidence 
  

   to 
  support 
  this 
  view. 
  

  

  . 
  As 
  was 
  mentioned 
  above, 
  the 
  Strepsiptera 
  and 
  Thysano- 
  

   ptera 
  are 
  highly 
  aberrant 
  insects 
  whose 
  closest 
  affinities 
  

   are 
  extremely 
  difficult 
  to 
  determine. 
  On 
  the 
  other 
  hand, 
  

   the 
  Psocidae, 
  together 
  with 
  the 
  Neuroptera, 
  furnish 
  us 
  

  

  