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  466 
  ) 
  

  

  [The 
  following 
  Addendum 
  to 
  Dr. 
  Chester 
  Crampton's 
  

   paper, 
  on 
  page 
  93, 
  has 
  been 
  received. 
  — 
  Ed.] 
  

  

  Since 
  sending 
  the 
  foregoing 
  paper 
  I 
  have 
  been 
  able 
  to 
  

   make 
  an 
  anatomical 
  study 
  of 
  the 
  interesting 
  Zorapteron, 
  

   Zorotypus 
  hubbardi, 
  recently 
  described 
  by 
  Mr. 
  A. 
  N. 
  Caudell, 
  

   and 
  this 
  has 
  convinced 
  me 
  that 
  the 
  Zoraptera, 
  which 
  

   are 
  anatomically 
  intermediate 
  between 
  the 
  Isoptera 
  and 
  

   the 
  Plecoptera 
  (with 
  their 
  strongest 
  affinities 
  on 
  the 
  side 
  

   of 
  the 
  Isoptera), 
  occupy 
  a 
  position 
  at 
  the 
  base 
  of 
  the 
  lines 
  

  

  NEUROPTERA 
  

   PSOCIDS 
  1 
  COLEOPTERA 
  

   ZORAPTERA 
  \ 
  I 
  DERMAPTERA 
  

  

  ISOPTERA. 
  \ 
  \ 
  1/ 
  / 
  EMBIIDS 
  

  

  PLECOPTERA 
  

  

  of 
  descent 
  leading 
  to 
  the 
  development 
  of 
  the 
  Psocid 
  type 
  

   of 
  insect. 
  The 
  Psocidae 
  and 
  Zoraptera 
  are 
  thus 
  ultimately 
  

   related 
  to 
  the 
  Isoptera 
  on 
  the 
  one 
  side, 
  and 
  to 
  the 
  Embiid- 
  

   Plecopteron 
  " 
  coterie 
  " 
  on 
  the 
  other, 
  and 
  their 
  hues 
  of 
  

   descent 
  originated 
  in 
  forms 
  occupying 
  a 
  position 
  inter- 
  

   mediate 
  between 
  the 
  two, 
  as 
  may 
  be 
  seen 
  from 
  the 
  ap- 
  

   pended 
  diagram, 
  which 
  represents 
  a 
  Uttle 
  more 
  acurately 
  

   than 
  the 
  foregoing 
  one 
  (p. 
  97), 
  the 
  relative 
  positions 
  of 
  the 
  

   lines 
  of 
  descent 
  of 
  the 
  more 
  primitive 
  relatives 
  of 
  the 
  

   Neuroptera 
  and 
  Psocidae. 
  

  

  The 
  statement 
  that 
  Plectrotarsus 
  gravenh&rsti 
  has 
  a 
  

   coiled 
  proboscis 
  (p. 
  113) 
  is 
  incorrect. 
  I 
  have 
  just 
  received 
  

   a 
  specimen 
  from 
  Dr. 
  Tillyard 
  and 
  find 
  that 
  it 
  is 
  merely 
  bent 
  

   at 
  an 
  angle, 
  not 
  coiled, 
  so 
  I 
  hasten 
  to 
  correct 
  my 
  previous 
  

   statement. 
  

  

  TRANS. 
  ENT. 
  SOC. 
  LOND. 
  1919.— 
  PARTS 
  III, 
  IV. 
  (jAN. 
  '20) 
  

  

  