﻿484 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  95 
  

  

  acter 
  by 
  which 
  each 
  species 
  may 
  be 
  recognized 
  regardless 
  of 
  the 
  amount 
  

   of 
  variation 
  in 
  other 
  respects, 
  or 
  a 
  character 
  by 
  which 
  the 
  group 
  may 
  

   be 
  subdivided. 
  In 
  the 
  Ophryastini 
  the 
  genitalia, 
  especially 
  those 
  of 
  

   the 
  female, 
  were 
  found 
  to 
  be 
  of 
  value 
  in 
  grouping 
  related 
  species, 
  and 
  

   often 
  in 
  distinguishing 
  individual 
  species. 
  

  

  I 
  agree 
  with 
  Ferris 
  (1928, 
  pp. 
  66-69) 
  in 
  his 
  remarks 
  upon 
  the 
  short- 
  

   comings 
  of 
  a 
  system 
  that 
  makes 
  more 
  or 
  less 
  of 
  a 
  fetish 
  of 
  perfect 
  

   specimens 
  when 
  their 
  complete 
  dismemberment 
  may 
  enhance 
  their 
  

   value 
  greatly 
  from 
  a 
  standpoint 
  of 
  accessibility 
  and 
  scientific 
  study, 
  

   and 
  in 
  his 
  statement 
  that 
  the 
  use 
  of 
  any 
  point 
  of 
  structure, 
  anatomy, 
  

   and 
  physiology 
  is 
  legitimate 
  in 
  classification. 
  At 
  the 
  same 
  time 
  the 
  

   truth 
  remains 
  that 
  in 
  any 
  systematic 
  study 
  a 
  compromise 
  must 
  be 
  

   made 
  between 
  the 
  ideal 
  and 
  the 
  possible 
  or 
  practical. 
  For 
  example, 
  in 
  

   Eupagoderes 
  the 
  male 
  internal 
  sac 
  and 
  at 
  least 
  one 
  of 
  the 
  valves 
  of 
  the 
  

   alimentary 
  canal 
  show 
  characters 
  of 
  value, 
  though 
  for 
  certain 
  practical 
  

   reasons 
  these 
  could 
  not 
  be 
  used 
  in 
  the 
  present 
  study. 
  A 
  similar 
  com- 
  

   promise 
  must 
  be 
  made 
  with 
  illustration, 
  the 
  quality 
  of 
  the 
  drawings 
  

   being 
  determined 
  by 
  the 
  artistic 
  ability 
  of 
  the 
  writer 
  or 
  by 
  the 
  avail- 
  

   ability 
  of 
  an 
  artist 
  trained 
  for 
  scientific 
  drawing. 
  

  

  Through 
  the 
  courtesy 
  of 
  J. 
  N. 
  Knull, 
  of 
  the 
  University 
  of 
  Ohio, 
  Dr. 
  

   R, 
  H. 
  Beamer, 
  of 
  the 
  University 
  of 
  Kansas, 
  E, 
  T. 
  Cresson, 
  of 
  the 
  

   Academy 
  of 
  Natural 
  Sciences 
  of 
  Philadelphia, 
  Gilbert 
  Arrow, 
  of 
  the 
  

   British 
  Museum, 
  L. 
  J. 
  Muchmore 
  and 
  Dr. 
  J. 
  A. 
  Comstock, 
  of 
  the 
  Los 
  

   Angeles 
  Museum, 
  and 
  Dr. 
  E. 
  A. 
  Chapin, 
  of 
  the 
  United 
  States 
  National 
  

   Museum, 
  I 
  have 
  been 
  able 
  to 
  study 
  all 
  or 
  part 
  of 
  the 
  material 
  in 
  their 
  

   respective 
  institutions. 
  Thanks 
  are 
  due 
  also 
  to 
  Dr. 
  E. 
  C. 
  Van 
  Dyke, 
  

   of 
  the 
  University 
  of 
  California, 
  for 
  comparison 
  of 
  specimens 
  with 
  his 
  

   types, 
  and 
  to 
  Dr. 
  P. 
  J. 
  Darlington, 
  Jr., 
  of 
  the 
  Museum 
  of 
  Comparative 
  

   Zoology, 
  for 
  comparing 
  specimens 
  with 
  types 
  in 
  the 
  LeConte 
  collec- 
  

   tion. 
  I 
  am 
  especially 
  indebted 
  to 
  H. 
  C. 
  Fall, 
  of 
  Tyngsboro, 
  Mass., 
  

   and 
  to 
  L. 
  L. 
  Buchanan, 
  of 
  the 
  Division 
  of 
  Insect 
  Identification, 
  

   Bureau 
  of 
  Entomology 
  and 
  Plant 
  Quarantine, 
  U. 
  S. 
  Department 
  of 
  

   Agriculture, 
  for 
  loan 
  of 
  material, 
  assistance, 
  advice, 
  and 
  criticism. 
  

  

  The 
  type 
  specimens 
  of 
  the 
  species 
  of 
  Ophryastini 
  are 
  scattered 
  

   from 
  England 
  to 
  California, 
  and 
  although 
  an 
  earnest 
  effort 
  was 
  made 
  

   it 
  was 
  impossible 
  to 
  see 
  them 
  aU. 
  In 
  some 
  cases 
  dissection 
  of 
  the 
  

   type 
  was 
  not 
  desirable, 
  even 
  when 
  it 
  was 
  available. 
  For 
  these 
  reasons 
  

   two 
  keys 
  were 
  sometimes 
  made, 
  one 
  based 
  upon 
  the 
  genitaha 
  as 
  far 
  

   as 
  known 
  at 
  present, 
  and 
  the 
  other 
  based 
  upon 
  external 
  characters. 
  

   The 
  species 
  not 
  examined 
  have 
  been 
  placed 
  in 
  the 
  keys 
  as 
  accurately 
  

   as 
  possible 
  from 
  published 
  descriptions. 
  

  

  Genitalia 
  were 
  prepared 
  for 
  study 
  in 
  the 
  following 
  manner: 
  The 
  

   thoroughly 
  relaxed 
  specimen 
  was 
  held 
  beneath 
  the 
  dissecting 
  micro- 
  

   scope 
  between 
  the 
  thumb 
  and 
  a 
  finger 
  of 
  the 
  left 
  hand, 
  ventral 
  side 
  

  

  