﻿412 
  Mr. 
  Frederick 
  Muir 
  on 
  the 
  

  

  two 
  small 
  subcrescent-shaped 
  sclerites 
  near 
  the 
  base 
  and 
  

   a 
  semichitinised 
  patch 
  near 
  the 
  apex 
  ; 
  there 
  is 
  no 
  complex 
  

   transfer 
  apparatus. 
  

  

  Muscles 
  connect 
  the 
  spiculum 
  of 
  the 
  eighth 
  sternite 
  with 
  

   the 
  seventh 
  sternite 
  (fig. 
  7), 
  and 
  a 
  larger 
  series 
  of 
  muscles 
  

   connect 
  the 
  plates 
  of 
  the 
  eighth 
  sternite 
  with 
  the 
  large 
  

   spiculum 
  of 
  the 
  ninth 
  sternite. 
  These 
  muscles 
  hold 
  the 
  

   ninth 
  sternite 
  and 
  its 
  spiculum 
  in 
  place 
  and 
  take 
  off 
  the 
  

   strain 
  of 
  the 
  protractors 
  and 
  retractors 
  of 
  the 
  tegmen 
  

   {g 
  and 
  b). 
  A 
  few 
  bundles 
  of 
  muscle 
  connect 
  the 
  small 
  

   spiculum 
  of 
  the 
  ninth 
  segment 
  to 
  the 
  connecting 
  membrane, 
  

   and 
  others 
  connect 
  it 
  with 
  the 
  walls 
  of 
  the 
  rectum 
  (fig. 
  6, 
  

   m, 
  k, 
  I). 
  

  

  The 
  retractor 
  of 
  the 
  tegmen 
  (figs. 
  7, 
  8 
  6) 
  consists 
  of 
  a 
  large 
  

   series 
  of 
  muscles 
  attached 
  to 
  the 
  membrane 
  {ini 
  1), 
  mainly 
  

   on 
  its 
  right 
  side 
  and 
  near 
  its 
  junction 
  with 
  the 
  tegmen, 
  and 
  

   to 
  the 
  apex 
  of 
  the 
  spiculum 
  {s'p). 
  

  

  The 
  protractor 
  of 
  the 
  tegmen 
  {g) 
  consists 
  of 
  a 
  large 
  

   bundle 
  of 
  muscles 
  from 
  the 
  inner 
  surface 
  of 
  the 
  base 
  of 
  the 
  

   spiculum 
  of 
  the 
  ninth 
  sternite 
  to 
  the 
  apex 
  of 
  the 
  tegminal 
  

   strut. 
  

  

  The 
  retractor 
  of 
  the 
  median 
  lobe 
  consists 
  of 
  a 
  long 
  muscle 
  

   from 
  the 
  inner 
  surface 
  of 
  the 
  apical 
  half 
  of 
  the 
  median 
  lobe 
  

   to 
  the 
  apex 
  of 
  the 
  tegminal 
  strut 
  (fig. 
  8 
  c). 
  

  

  The 
  protractor 
  of 
  the 
  median 
  lobe 
  (fig. 
  8 
  d) 
  proceeds 
  from 
  

   the 
  ring 
  of 
  the 
  tegmen 
  to 
  the 
  apical 
  portion 
  of 
  the 
  median 
  

   struts. 
  

  

  Retractors 
  of 
  the 
  internal 
  sac 
  (fig. 
  8 
  e) 
  are 
  yery 
  long 
  and 
  

   fine 
  muscles 
  from 
  the 
  apex 
  of 
  the 
  median 
  struts 
  to 
  areas 
  on 
  

   the 
  internal 
  sac, 
  a 
  few 
  to 
  the 
  crescent-shaped 
  sclerite 
  near 
  

   the 
  base 
  of 
  the 
  sac, 
  and 
  others 
  to 
  the 
  semichitinous 
  area 
  

   near 
  the 
  apex. 
  There 
  are 
  other 
  small 
  bundles 
  from 
  the 
  sac 
  

   to 
  the 
  inner 
  surface 
  of 
  the 
  median 
  lobe. 
  

  

  Another 
  muscle 
  (fig. 
  8 
  n) 
  connects 
  the 
  apex 
  of 
  the 
  teg- 
  

   minal 
  strut 
  with 
  the 
  apex 
  of 
  the 
  median 
  struts. 
  This 
  

   would 
  help 
  to 
  co-ordinate 
  the 
  movements. 
  

  

  To 
  those 
  who 
  are 
  interested 
  in 
  the 
  mechanism 
  of 
  insect- 
  

   structure 
  these 
  few 
  notes 
  may 
  be 
  of 
  interest, 
  and 
  may 
  lead 
  

   them 
  to 
  work 
  on 
  the 
  details 
  of 
  various 
  forms. 
  The 
  task 
  is 
  

   huge, 
  and 
  the 
  information 
  desired 
  is 
  harder 
  to 
  procure 
  than 
  

   that 
  relating 
  to 
  the 
  external 
  morphology, 
  but 
  no 
  final 
  

   " 
  natural 
  classification 
  " 
  can 
  be 
  attained 
  without 
  studying 
  

   the 
  male 
  genitaha, 
  and 
  the 
  mechanism 
  and 
  function 
  are 
  an 
  

   important 
  part 
  of 
  that 
  study. 
  • 
  

  

  