﻿84 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  67 
  

  

  Ilantisoma, 
  Iakovlev, 
  V. 
  E. 
  Materials 
  for 
  the 
  entomological 
  fauna 
  of 
  Euro- 
  

   pean 
  Russia, 
  Proc. 
  Russian 
  Ent. 
  Soc, 
  St. 
  Petersburg, 
  vol. 
  7, 
  1874, 
  pp. 
  34-35, 
  

   pi. 
  1, 
  fig. 
  2. 
  [Monobasic, 
  genotype 
  M. 
  apiera, 
  new 
  species.] 
  The 
  citation 
  

   of 
  this 
  genus 
  from 
  Horae 
  Soc. 
  Ent. 
  Ross., 
  sometimes 
  seen, 
  is, 
  of 
  course, 
  in- 
  

   correct. 
  

  

  In 
  the 
  form 
  of 
  the 
  forelegs 
  this 
  genus 
  resembles 
  Emesaya, 
  Gar- 
  

   denia, 
  and 
  Ghilianella, 
  but 
  is 
  readily 
  distinguished 
  from 
  them 
  by 
  the 
  

   characters 
  indicated 
  in 
  the 
  generic 
  key 
  (figs. 
  139, 
  141.) 
  . 
  In 
  the 
  caudal 
  

   elongation 
  of 
  the 
  apical 
  abdominal 
  tergite 
  of 
  the 
  male, 
  which 
  covers 
  

   the 
  dorsal 
  surface 
  of 
  the 
  hypopygium 
  to 
  or 
  beyond 
  the 
  apex, 
  the 
  

   genus 
  resembles 
  some 
  of 
  the 
  species 
  in 
  Ghilianella, 
  but 
  the 
  cephalic 
  

   and 
  some 
  other 
  characters 
  readily 
  separate 
  it 
  from 
  that 
  genus. 
  The 
  

   venation 
  of 
  the 
  forewings 
  (fig. 
  142) 
  is 
  evidence 
  of 
  relationship 
  to 
  

   Emesaya 
  and 
  Gardena, 
  but 
  the 
  fore 
  tarsal 
  structure 
  and 
  the 
  form 
  

   of 
  the 
  hypopygia 
  are 
  quite 
  different 
  and 
  indicate 
  that 
  Metapterus 
  

   is 
  no 
  more 
  closely 
  related 
  to 
  these 
  genera 
  than 
  to 
  Ghilianella. 
  The 
  

   apical 
  antennal 
  segment 
  is 
  at 
  least 
  four 
  times 
  as 
  long 
  as 
  the 
  sub- 
  

   apical. 
  

  

  Our 
  identification 
  of 
  Barce 
  with 
  Metapterus 
  is 
  based 
  on 
  compari- 
  

   son 
  of 
  the 
  two 
  type 
  species, 
  the 
  specimens 
  of 
  Metapterus 
  linearis 
  in 
  

   our 
  hands 
  being 
  some 
  identified 
  by 
  Dr. 
  A. 
  "L. 
  Montandon. 
  The 
  male 
  

   hypopygium 
  of 
  this 
  species 
  has 
  a 
  longer 
  central 
  spine 
  than 
  in 
  the 
  

   most 
  closely 
  related 
  American 
  species 
  (uhleri, 
  neglectus) 
  and 
  this 
  

   causes 
  the 
  last 
  tergite 
  to 
  appear 
  more 
  decidedly 
  arcuate. 
  The 
  hy- 
  

   popygial 
  claspers 
  are 
  rectangularly 
  bent 
  at 
  about 
  midway 
  to 
  apices 
  r 
  

   the 
  apical 
  half 
  projecting 
  upward 
  like 
  the 
  central 
  thorn, 
  whereas 
  

   in 
  the 
  North 
  American 
  species 
  the 
  claspers 
  are 
  slightly 
  or 
  almost 
  

   imperceptibly 
  curved. 
  The 
  female 
  of 
  M. 
  linearis 
  resembles 
  that 
  of 
  

   uhleri 
  most 
  closely, 
  the 
  apical 
  tergite 
  being 
  without 
  notch, 
  and 
  the 
  

   sixth 
  sternite 
  without 
  a 
  broad 
  central 
  emargination 
  ; 
  the 
  apical 
  tergite 
  

   is 
  broadly 
  deflexed 
  on 
  apical 
  half. 
  

  

  ... 
  KEY 
  TO 
  THE 
  SPECIES. 
  

  

  Males. 
  

  

  1. 
  Basal 
  spine 
  of 
  postero-ventral 
  series 
  on 
  fore 
  femur 
  less 
  than 
  its 
  own 
  length 
  

  

  from 
  base 
  of 
  femur; 
  apical 
  outline 
  of 
  hypopygium 
  from 
  side 
  irregular 
  (fig. 
  

  

  147) 
  aberrans, 
  new 
  species 
  (p. 
  86). 
  

  

  Basal 
  spine 
  of 
  postero-ventral 
  series 
  on 
  fore 
  femur 
  more 
  than 
  its 
  own 
  length 
  

   from 
  base 
  of 
  femur 
  ; 
  apical 
  outline 
  of 
  hypopygium 
  from 
  side 
  usually 
  

   regularly 
  rounded 
  2 
  

  

  2. 
  Head 
  with 
  a 
  pale 
  yellowish 
  stripe 
  along 
  venter 
  which 
  is 
  of 
  about 
  equal 
  width 
  

  

  on 
  its 
  entire 
  length, 
  filling 
  the 
  interocular 
  space, 
  and 
  without 
  a 
  dark 
  spot 
  

   on 
  each 
  side 
  behind 
  eye 
  ; 
  upper 
  margin 
  of 
  hypopygium 
  with 
  a 
  squarish 
  

   backwardly 
  curved 
  process 
  which 
  is 
  more 
  or 
  less 
  emarginate 
  at 
  tip 
  (fig. 
  

   15S), 
  no 
  erect 
  spine 
  within 
  the 
  upper 
  border 
  of 
  hypopygium 
  3 
  

  

  