﻿10 
  Rev. 
  T. 
  A. 
  Marshall's 
  Monograph 
  of 
  

  

  These 
  insects 
  cannot 
  be 
  identified 
  successfully 
  without 
  

   some 
  attention 
  to 
  the 
  preparation 
  of 
  the 
  specimens. 
  

   The 
  principal 
  characters 
  will 
  always 
  have 
  to 
  be 
  taken 
  

   from 
  the 
  upper 
  side, 
  and 
  with 
  this 
  object 
  in 
  view 
  the 
  

   specimen 
  must 
  by 
  no 
  means 
  be 
  pinned, 
  which 
  renders 
  

   the 
  display 
  of 
  the 
  wings 
  and 
  legs 
  almost 
  impossible, 
  

   besides 
  destroying 
  the 
  thorax, 
  — 
  but 
  it 
  must 
  be 
  neatly 
  

   set 
  out 
  on 
  a 
  card. 
  It 
  is 
  necessary 
  also 
  in 
  every 
  case 
  to 
  

   inspect 
  the 
  clypeus 
  and 
  the 
  fovea 
  or 
  furrow 
  of 
  the 
  pleurae, 
  

   situated 
  immediately 
  above 
  the 
  middle 
  coxae, 
  and 
  this 
  

   becomes 
  impossible 
  when 
  the 
  insect 
  is 
  fastened 
  down 
  

   flat. 
  It 
  will 
  not 
  do 
  to 
  provide 
  against 
  one 
  of 
  these 
  

   difficulties 
  and 
  neglect 
  the 
  other; 
  both 
  must 
  be 
  over- 
  

   come, 
  or 
  the 
  result 
  will 
  almost 
  certainl}' 
  be 
  disappoint- 
  

   ment. 
  The 
  question 
  then 
  arises 
  how 
  two 
  requirements, 
  

   apparently 
  inconsistent 
  with 
  each 
  other, 
  can 
  be 
  fulfilled 
  

   with 
  the 
  least 
  amount 
  of 
  trouble. 
  One 
  obvious 
  mode 
  of 
  

   j)roceeding 
  is 
  that 
  which 
  I 
  have 
  adopted 
  for 
  about 
  two 
  

   years, 
  viz., 
  never 
  to 
  set 
  a 
  freshly 
  taken 
  Ojnus 
  without 
  

   first 
  inspecting, 
  and 
  writing 
  down, 
  the 
  two 
  characters 
  

   taken 
  from 
  the 
  clypeus 
  and 
  the 
  pleurae. 
  By 
  this 
  method 
  

   not 
  a 
  moment 
  of 
  time 
  is 
  wasted, 
  future 
  certainty 
  is 
  pro- 
  

   vided 
  for, 
  and 
  the 
  proper 
  preservation 
  of 
  the 
  specimen 
  

   is 
  insured. 
  If 
  this 
  preliminary 
  examination 
  be 
  neglected, 
  

   it 
  is 
  still 
  possible 
  so 
  to 
  set 
  a 
  specimen 
  that 
  it 
  may 
  be 
  

   removed 
  from 
  the 
  card 
  at 
  pleasure, 
  not 
  without 
  trouble, 
  

   but 
  with 
  very 
  trifling 
  trouble. 
  Dr. 
  Capron 
  has 
  explained, 
  

   in 
  the 
  ' 
  Entomologist,' 
  how 
  this 
  may 
  be 
  eflected, 
  and 
  it 
  

   is 
  not 
  necessary 
  to 
  repeat 
  his 
  remarks 
  here. 
  A 
  dried 
  

   Opius, 
  perfectly 
  well-set, 
  may 
  be 
  fixed 
  on 
  its 
  card 
  with 
  

   an 
  almost 
  invisibly 
  small 
  drop 
  of 
  gum 
  under 
  the 
  thorax, 
  

   or 
  better 
  still, 
  under 
  the 
  abdomen, 
  leaving 
  the 
  antennae, 
  

   wings, 
  and 
  legs 
  quite 
  free. 
  A 
  wet 
  camel-hair 
  pencil 
  

   dissolves 
  this 
  gum 
  in 
  a 
  moment, 
  and 
  the 
  specimen 
  may 
  

   then 
  be 
  examined 
  in 
  any 
  position, 
  and 
  afterwards 
  re- 
  

   turned 
  to 
  its 
  card. 
  

  

  Table 
  of 
  Genera. 
  

  

  (2) 
  1. 
  Occiput 
  acutely 
  margined 
  ; 
  body 
  scabrous, 
  

   not 
  shining 
  ; 
  radial 
  areolet 
  incompletely 
  

   closed 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  i. 
  Ademon. 
  

  

  (1) 
  2. 
  Occput 
  not 
  margined 
  ; 
  general 
  surface 
  of 
  the 
  

   body 
  shining, 
  with 
  only 
  a 
  few 
  portions 
  ru- 
  

   gose 
  ; 
  radial 
  areolet 
  closed 
  (except 
  in 
  Dia- 
  

   ■ 
  cliaxiiiii 
  cajTev), 
  

  

  