﻿8 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.67 
  

  

  longer 
  than 
  femur, 
  basitarsus 
  barely 
  as 
  long 
  as 
  next 
  three 
  joints; 
  

   abdomen 
  narrower, 
  second 
  tergite 
  much 
  longer 
  than 
  broad 
  at 
  apex; 
  

   abdomen 
  apically 
  immaculate; 
  apical 
  joints 
  of 
  all 
  trochanters 
  

   testaceous. 
  

  

  Type-locality. 
  — 
  Ohio. 
  

  

  Type.— 
  Cat. 
  No. 
  27684, 
  U.S.N.M. 
  

  

  One 
  of 
  each 
  sex 
  received 
  from 
  Prof. 
  C. 
  H. 
  Kennedy 
  of 
  Ohio 
  State 
  

  

  University. 
  

  

  Genus 
  SYZEUCTUS 
  Foerster 
  

  

  Foerster, 
  Ashmead, 
  and 
  Schmiedeknecht 
  all 
  employ 
  as 
  one 
  of 
  the 
  

   key 
  characters 
  ascribed 
  to 
  this 
  genus 
  the 
  lack 
  of 
  a 
  carina 
  separating 
  

   metapleurum 
  and 
  propodeum. 
  As 
  a 
  matter 
  of 
  fact, 
  the 
  genotype, 
  

   maculatorius 
  (Fabricius), 
  frequently 
  has 
  a 
  more 
  or 
  less 
  developed 
  

   carina, 
  while 
  the 
  two 
  species 
  described 
  below 
  have 
  it 
  well 
  developed. 
  

   The 
  only 
  real 
  difference 
  between 
  the 
  present 
  genus 
  and 
  its 
  nearest 
  

   relative, 
  Diceratops 
  Foerster, 
  lies 
  in 
  the 
  frontal 
  horns 
  of 
  the 
  latter. 
  

  

  SYZEUCTUS 
  SIGMOID 
  ALIS, 
  new 
  species 
  

  

  Especially 
  remarkable 
  for 
  the 
  peculiar 
  nervellus. 
  

  

  Female. 
  — 
  Length, 
  9 
  mm.; 
  antennae, 
  7.5 
  mm.; 
  ovipositor, 
  6.5 
  mm. 
  

  

  Head 
  transversely 
  oval, 
  temples 
  convexly 
  sloping; 
  postvertex 
  

   (that 
  portion 
  of 
  the 
  head 
  lying 
  between 
  the 
  ocelli 
  and 
  the 
  occipital 
  

   carina) 
  medially 
  impressed, 
  polished 
  with 
  a 
  few 
  scattered 
  punctures; 
  

   temples 
  with 
  more 
  numerous 
  punctures, 
  running 
  into 
  fine 
  shagreen- 
  

   ing 
  on 
  cheeks; 
  vertex 
  and 
  frons 
  more 
  densely 
  punctate, 
  the 
  latter 
  

   medially 
  slightly 
  concave; 
  aface 
  similarly 
  punctate, 
  strongly 
  convex, 
  

   with 
  a 
  rather 
  deep 
  impression 
  on 
  each 
  side 
  just 
  below 
  level 
  of 
  

   antennae; 
  clypeus 
  separated 
  from 
  face 
  by 
  a 
  broad 
  deep 
  groove; 
  

   polished 
  with 
  few 
  punctures; 
  malar 
  space 
  nearly 
  as 
  long 
  as 
  basal 
  

   width 
  of 
  mandible. 
  Thorax 
  and 
  prododeum 
  with 
  coarse 
  and 
  dense 
  

   but 
  distinct 
  punctures, 
  finer 
  and 
  closer 
  on 
  prescutum, 
  coarsest 
  on 
  

   propodeum; 
  apical 
  and 
  pleural 
  carinae 
  complete; 
  nervellus 
  a 
  sig- 
  

   moid 
  curve, 
  more 
  strongly 
  curved 
  below 
  where 
  it 
  turns 
  backward 
  

   and 
  is 
  apparently 
  continuous 
  with 
  the 
  obsolete 
  discoidella; 
  hind 
  

   tibia 
  about 
  one 
  and 
  one-half 
  times 
  as 
  long 
  as 
  femur, 
  basitarsus 
  as 
  

   long 
  as 
  three 
  following 
  joints. 
  Abdomen 
  minutely 
  and 
  faintly 
  

   shagreened 
  and 
  sparsely 
  and 
  finely 
  punctate, 
  broadly 
  polished; 
  

   first 
  tergite 
  two-thirds 
  as 
  broad 
  at 
  apex 
  as 
  long, 
  sides 
  straight, 
  

   spiracles 
  at 
  basal 
  third; 
  tergites 
  2-4 
  as 
  long 
  as 
  broad 
  at 
  base, 
  others 
  

   successively 
  rapidly 
  shorter. 
  

  

  Black 
  with 
  abdomen 
  partly 
  red; 
  upper 
  anterior 
  and 
  posterior 
  

   orbits, 
  broad 
  on 
  frons 
  and 
  narrowly 
  confluent 
  on 
  apex, 
  clypeus 
  at 
  

   apex, 
  and 
  spot 
  on 
  base 
  of 
  mandible 
  yellow; 
  antennae 
  black 
  basally 
  

   and 
  above, 
  brown 
  beneath 
  nearly 
  to 
  base 
  of 
  flagellum; 
  palpi 
  brownish 
  

   testaceous. 
  Thorax 
  immaculate; 
  tegulae 
  piceous; 
  wings 
  hyaline, 
  

  

  