﻿HOW 
  INSECTS 
  FLY 
  SNODGEASS 
  

  

  385 
  

  

  The 
  remarkable 
  thing 
  about 
  the 
  Carboniferous 
  insects 
  is 
  not 
  that 
  

   they 
  existed 
  in 
  great 
  abundance 
  at 
  so 
  remote 
  a 
  period, 
  but 
  that 
  they 
  

   differed 
  comparatively 
  little 
  from 
  modern 
  insects. 
  Of 
  course, 
  ento- 
  

  

  B 
  

  

  Figure 
  l. 
  

  

  -Carboniferous 
  roaches. 
  A, 
  Asemoblatta 
  mazona 
  (from 
  Handlirsch 
  after 
  

   Scudder); 
  B, 
  Fhytloblatta 
  carbonarit 
  (from 
  Handlirsch"* 
  

  

  mologists 
  find 
  many 
  characters 
  that 
  separate 
  the 
  Paleodictyoptera 
  

   and 
  their 
  associates 
  from 
  their 
  modern 
  relatives, 
  but 
  the 
  distinctive 
  

   features 
  have 
  to 
  do 
  mostly 
  with 
  details 
  of 
  the 
  wing 
  venation. 
  All 
  the 
  

  

  B 
  

  

  FiflDEE 
  2. 
  — 
  Paleozoic 
  insects 
  with 
  paranotal 
  lobes 
  (pnl) 
  on 
  the 
  prothorax. 
  A, 
  Stenodictya 
  lobata, 
  

   one 
  of 
  the 
  Paleodictyoptera 
  (from 
  Brongnlart); 
  B, 
  LemmatophoTatypica, 
  a. 
  j)nmitive 
  stone 
  fly 
  

   (from 
  TDlyard) 
  

  

  Carboniferous 
  insects 
  so 
  far 
  discovered 
  had 
  two 
  pairs 
  of 
  well-developed 
  

   wings, 
  the 
  structure 
  of 
  which 
  is 
  so 
  nearly 
  like 
  that 
  of 
  the 
  wings 
  of 
  

   present-day 
  ine^eets 
  that 
  only 
  a 
  specialist 
  would 
  discover 
  the 
  dif- 
  

  

  