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  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  Study 
  of 
  such 
  genera 
  as 
  have 
  been 
  available 
  to 
  me 
  has 
  led 
  to 
  the 
  

   discovery 
  of 
  a 
  number 
  of 
  characters 
  not 
  previously 
  employed 
  in 
  the 
  

   classification 
  of 
  the 
  group. 
  Using 
  these 
  characters, 
  together 
  with 
  the 
  

   best 
  of 
  the 
  old 
  characters 
  and 
  others 
  gleaned 
  from 
  generic 
  and 
  specific 
  

   descriptions, 
  I 
  have 
  attempted 
  to 
  produce 
  a 
  more 
  nearly 
  natural 
  classi- 
  

   fication 
  than 
  any 
  pubUshed 
  heretofore. 
  

  

  SOURCES 
  OF 
  MATERIAL 
  

  

  This 
  study 
  is 
  based 
  principally 
  on 
  material 
  in 
  the 
  collection 
  of 
  the 
  

   United 
  States 
  National 
  Museum, 
  which 
  contains 
  specimens 
  of 
  

   Ophionini 
  from 
  all 
  the 
  zoogeographic 
  regions 
  of 
  the 
  earth, 
  including 
  

   representatives 
  of 
  a 
  majority 
  of 
  the 
  previously 
  described 
  genera 
  and 
  of 
  

   all 
  the 
  new 
  genera 
  described 
  in 
  this 
  revision. 
  A 
  vast 
  amount 
  of 
  

   North 
  American 
  material, 
  mostly 
  referable 
  to 
  Ophion 
  and 
  Enicospilus 
  

   secured 
  on 
  loan 
  from 
  the 
  collections 
  of 
  many 
  institutions 
  and 
  private 
  

   collectors, 
  has 
  been 
  studied. 
  Particularly 
  important, 
  with 
  respect 
  to 
  

   the 
  present 
  revision, 
  are 
  the 
  collections 
  received 
  from 
  the 
  CaUfornia 
  

   Academy 
  of 
  Sciences, 
  the 
  American 
  Museum 
  of 
  Natural 
  History, 
  the 
  

   University 
  of 
  Kansas, 
  Cornell 
  University, 
  and 
  the 
  private 
  collection 
  

   of 
  Henry 
  K. 
  and 
  Marjorie 
  C. 
  Townes, 
  since 
  these 
  contain 
  material 
  

   of 
  many 
  more 
  of 
  the 
  Nearctic 
  genera 
  other 
  than 
  Ophion 
  and 
  Enicospilus 
  

   than 
  do 
  any 
  of 
  the 
  others. 
  To 
  these 
  and 
  to 
  other 
  institutions 
  from 
  

   which 
  material 
  was 
  secured 
  I 
  hereby 
  extend 
  my 
  thanks. 
  

  

  ILLUSTRATIONS 
  

  

  All 
  the 
  figures, 
  except 
  plate 
  55, 
  figure 
  71, 
  were 
  drawn 
  by 
  Arthur 
  D. 
  

   Cuslmian, 
  scientific 
  illustrator, 
  U. 
  S. 
  Bureau 
  of 
  Entomology 
  and 
  Plant 
  

   Quarantine. 
  I 
  am 
  grateful 
  to 
  him 
  for 
  the 
  accuracy 
  of 
  his 
  drawings. 
  

  

  TRIBAL 
  CHARACTERS 
  AND 
  RELATED 
  TRIBES 
  

  

  Among 
  the 
  tribes 
  of 
  the 
  Ophioninae 
  are 
  three, 
  Ophionini, 
  Hell- 
  

   wigiini, 
  and 
  Anomalini 
  (Nototrachini) 
  , 
  that 
  have 
  traditionally 
  been 
  

   separated 
  from 
  the 
  rest 
  of 
  the 
  tribes 
  in 
  tribal 
  keys 
  by 
  the 
  single 
  

   character 
  of 
  the 
  position 
  of 
  the 
  second 
  recurrent 
  vein 
  basad 
  of 
  the 
  

   intercubitus. 
  This 
  has 
  resulted 
  in 
  the 
  placing 
  in 
  the 
  Ophionini 
  of 
  

   genera, 
  especially 
  certain 
  genera 
  of 
  Therionini, 
  that 
  obviously 
  do 
  not 
  

   belong 
  there 
  when 
  other 
  characters 
  are 
  taken 
  into 
  consideration. 
  

  

  Some 
  authors 
  have 
  included 
  Hellwigia 
  Gravenhorst 
  in 
  the 
  Ophionini, 
  

   while 
  Morley 
  unites 
  the 
  Anomalini 
  with 
  Ophionini 
  and 
  excludes 
  

   Hellwigia. 
  The 
  genera 
  Hellwigia 
  and 
  Hellwigiella 
  Sz^pligeti 
  are 
  

   obviously 
  not 
  at 
  all 
  closely 
  related. 
  Since 
  this 
  paper 
  was 
  sent 
  to 
  

   press 
  I 
  have, 
  through 
  the 
  kindness 
  of 
  Dr. 
  H. 
  K. 
  Townes, 
  been 
  able 
  

   to 
  examine 
  specimens 
  of 
  both 
  genera. 
  Hellwigiella 
  I 
  find 
  to 
  belong 
  

   to 
  the 
  Ophionini, 
  but 
  Hellwigia 
  I 
  believe 
  to 
  belong 
  to 
  the 
  

   Campoplegini, 
  as 
  indicated 
  on 
  a 
  later 
  page. 
  

  

  