﻿art. 
  8 
  REVISION 
  OF 
  THE 
  GENUS 
  MICROBRACON— 
  ^MUESEBECK 
  45 
  

  

  This 
  material 
  is 
  from 
  Watertown, 
  Maiden, 
  Melrose, 
  Stoneham, 
  Sau- 
  

  

  gus, 
  and 
  Wakefield, 
  Massachusetts. 
  One 
  of 
  these 
  specimens 
  was 
  

   compared 
  with 
  the 
  type, 
  designated 
  a 
  homotype, 
  and 
  placed 
  in 
  the 
  

   United 
  States 
  National 
  Museum. 
  

  

  29. 
  MICROBRACON 
  RLDBECKIAE, 
  new 
  species 
  

  

  Figs. 
  2, 
  22 
  

  

  Female. 
  — 
  Length. 
  3.3 
  mm. 
  Head 
  rather 
  thin, 
  not 
  prominent 
  at 
  

   insertion 
  of 
  antennae, 
  the 
  face 
  rather 
  flat, 
  not, 
  or 
  very 
  slightly, 
  re- 
  

   ceding; 
  eyes 
  small; 
  ocelli 
  small; 
  ocell-ocular 
  line 
  more 
  three 
  times 
  

   the 
  diameter 
  of 
  an 
  ocellus; 
  postocellar 
  line 
  about 
  twice 
  the 
  diameter 
  

   of 
  an 
  ocellus: 
  opening 
  between 
  clypeus 
  and 
  mandibles 
  large, 
  its 
  

   transverse 
  diameter 
  nearly 
  twice 
  the 
  length 
  of 
  malar 
  space; 
  face, 
  

   frons, 
  vertex, 
  temples, 
  smooth 
  and 
  polished; 
  antennae 
  24-segmented, 
  

   shorter 
  than 
  the 
  body, 
  basal 
  flagellar 
  segments 
  the 
  longest; 
  thorax 
  

   stout, 
  smooth, 
  and 
  polished; 
  the 
  parapsidal 
  grooves 
  sparsely 
  hairy; 
  

   propodeum 
  entirely 
  polished, 
  without 
  even 
  a 
  suggestion 
  of 
  a 
  stub 
  

   of 
  a 
  carina 
  at 
  apex; 
  second 
  abscissa 
  of 
  radius 
  usually 
  distinctly 
  less 
  

   than 
  twice 
  the 
  first 
  ; 
  the 
  third 
  longer 
  than 
  the 
  first 
  and 
  second 
  com- 
  

   bined 
  and 
  usually 
  about 
  twice 
  as 
  long 
  as 
  the 
  second, 
  which 
  is 
  but 
  

   little 
  longer 
  than 
  the 
  first 
  intercubitus 
  ; 
  the 
  portion 
  of 
  cubitus 
  be- 
  

   tween 
  recurrent 
  and 
  first 
  intercubitus 
  more 
  than 
  half 
  as 
  long 
  as 
  the 
  

   recurrent; 
  the 
  last 
  abscissa 
  of 
  cubitus 
  considerably 
  longer 
  than 
  the 
  

   preceding 
  abscissa; 
  legs 
  slender; 
  last 
  segment 
  of 
  posterior 
  tarsi 
  not 
  

   as 
  long 
  as 
  the 
  second 
  ; 
  abdomen 
  a 
  little 
  longer 
  than 
  the 
  thorax 
  ; 
  the 
  

   chitinized 
  plate 
  of 
  the 
  first 
  tergite 
  nearly 
  parallel-sided, 
  angled 
  at 
  

   the 
  spiracles, 
  smooth 
  and 
  polished, 
  with 
  two 
  fine 
  curved 
  grooves 
  con- 
  

   verging 
  toward 
  the 
  base 
  ; 
  second 
  tergite 
  transverse, 
  with 
  conspicuous 
  

   membranous 
  areas 
  laterally 
  opposite 
  the 
  membranous 
  margins 
  along 
  

   the 
  first 
  tergite. 
  and 
  with 
  a 
  slight 
  tubercle 
  at 
  base 
  and 
  adjoining 
  fine 
  

   striae; 
  third 
  and 
  following 
  tergites 
  smooth 
  and 
  polished; 
  ovipositor 
  

   sheaths 
  distinctly 
  longer 
  than 
  the 
  entire 
  body. 
  Yellow; 
  vertex 
  of 
  

   head 
  and 
  occiput 
  more 
  or 
  less 
  piceous; 
  mesonotal 
  lobes 
  and 
  propo- 
  

   deum 
  sometimes 
  a 
  little 
  dusky; 
  wings 
  distinctly 
  infuscated 
  on 
  basal 
  

   two-thirds, 
  nearly 
  hyaline 
  at 
  apex; 
  legs 
  including 
  all 
  coxae 
  yellow, 
  

   the 
  tibiae 
  usually 
  slightly 
  dusky. 
  

  

  Male. 
  — 
  Antennae 
  26-segmented. 
  Essentially 
  as 
  in 
  the 
  female. 
  

  

  Type.— 
  Cat. 
  No. 
  26662, 
  U.S.N.M. 
  

  

  Type-locality. 
  — 
  Mineral 
  Wells. 
  Texas. 
  

  

  Host. 
  — 
  A 
  larva 
  living 
  in 
  the 
  head 
  of 
  Rudbeckia 
  amplex. 
  

  

  Described 
  from 
  20 
  female 
  and 
  2 
  male 
  specimens 
  reared 
  by 
  C. 
  R. 
  

   Jones. 
  The 
  number 
  of 
  segments 
  in 
  the 
  antennae 
  in 
  this 
  series 
  varies 
  

   from 
  23 
  to. 
  26. 
  

  

  