﻿201 
  

  

  A 
  NEW 
  HYMENOPTEROUS 
  PARASITE 
  OF 
  THE 
  AUSTRALIAN 
  FERN 
  

   WEEVIL, 
  SYAGRIUS 
  FULVITARSIS, 
  PASC. 
  

  

  By 
  D. 
  T. 
  Fullaway. 
  

  

  Ischiogonus 
  syagrii, 
  sp. 
  n. 
  

  

  Female. 
  Long, 
  3-75 
  mm. 
  Ochraceous 
  (brown 
  ochre, 
  Winsor 
  & 
  Newton), 
  the 
  

   eyes, 
  antennae 
  outwardly, 
  tips 
  of 
  mandibles, 
  ocellar 
  space, 
  presternum 
  anteriorly 
  

   and 
  a 
  thin 
  line 
  on 
  either 
  side 
  on 
  the 
  groove 
  of 
  the 
  notum, 
  a 
  large 
  spot 
  anteriorly 
  on 
  

   the 
  mesopleurae, 
  distal 
  tarsal 
  segment 
  and 
  the 
  sheath 
  of 
  the 
  ovipositor 
  black. 
  More 
  

   or 
  less 
  thinly 
  clothed 
  with 
  hair. 
  

  

  Head 
  cubical, 
  slightly 
  convex, 
  temples 
  rounded, 
  face 
  somewhat 
  retracted, 
  cheeks 
  

   polished, 
  fairly 
  wide, 
  eyes 
  bulging 
  slightly, 
  ocelli 
  arranged 
  in 
  an 
  equilateral 
  triangle 
  

   on 
  the 
  vertex, 
  the 
  members 
  about 
  one 
  diameter 
  apart 
  and 
  four 
  from 
  the 
  border 
  of 
  

   the 
  eye 
  ; 
  antennae 
  placed 
  on 
  a 
  slight 
  ridge 
  at 
  the 
  junction 
  of 
  the 
  front 
  and 
  top 
  of 
  

   the 
  head, 
  in 
  circular 
  sockets 
  equidistant 
  from 
  each 
  other 
  and 
  from 
  border 
  of 
  eye, 
  

   filiform, 
  as 
  long 
  as 
  the 
  body, 
  with 
  28-31 
  segments, 
  scape 
  and 
  pedicel 
  stouter 
  than 
  the 
  

   segments 
  composing 
  the 
  flagellum 
  ; 
  mandibles 
  short, 
  stout, 
  curved, 
  acutely 
  pointed 
  

   at 
  apex. 
  Thorax 
  rugoso-punctate 
  ; 
  pronotum 
  and 
  pleurae 
  concave 
  medially, 
  the 
  

   concavity 
  costate 
  ; 
  presternum 
  smoother 
  ; 
  mesonotum 
  finely 
  punctate, 
  tri-lobed, 
  

   the 
  lobes 
  slightly 
  convex, 
  parapsidal 
  furrows 
  widely 
  separated 
  and 
  fairly 
  deep 
  in 
  

   front, 
  converging 
  posteriorly 
  where 
  they 
  merge 
  into 
  a 
  broad 
  shallow 
  depression 
  ; 
  

   mesopleurae 
  below 
  and 
  mesosternum 
  more 
  finely 
  punctate, 
  smooth 
  and 
  shining, 
  

   disc 
  of 
  the 
  scutellum 
  flat, 
  keystone-shaped, 
  smooth 
  and 
  finely 
  punctate, 
  two 
  oval 
  

   foveae 
  at 
  base 
  ; 
  metanotum 
  convex, 
  rugose, 
  biareolate 
  basally, 
  the 
  areolae 
  large 
  

   extending 
  more 
  than 
  half 
  the 
  length 
  and 
  finely 
  rugulose. 
  Abdomen 
  elongate 
  ovate, 
  

   1st 
  segment 
  a 
  little 
  longer 
  than 
  apically 
  wide, 
  the 
  2nd 
  twice 
  as 
  wide 
  as 
  long, 
  the 
  

   remainder 
  transverse, 
  tergites 
  of 
  1st 
  and 
  2nd 
  longitudinally 
  striate, 
  3rd 
  and 
  4th 
  with 
  

   short 
  striae 
  in 
  a 
  transverse 
  furrow 
  behind 
  the 
  anterior 
  margin 
  widening 
  laterally, 
  

   the 
  remaining 
  surface 
  smooth 
  and 
  polished, 
  each 
  segment 
  behind 
  the 
  2nd 
  bearing 
  

   a 
  transverse 
  fascia 
  of 
  hairs, 
  ovipositor 
  not 
  quite 
  as 
  long 
  as 
  the 
  abdomen 
  and 
  hairy. 
  

   Legs 
  slender. 
  Wings 
  infuscate, 
  long 
  and 
  narrow, 
  stigma 
  lanceolate, 
  yellowish 
  brown, 
  

   first 
  abscissa 
  of 
  radius 
  a 
  trifle 
  more 
  than 
  half 
  the 
  length 
  of 
  second, 
  second 
  cubital 
  

   cell 
  nearly 
  twice 
  as 
  long 
  as 
  wide 
  and 
  parallel-sided, 
  recurrent 
  nervure 
  entering 
  first 
  

   cubital 
  cell, 
  nervellus 
  post-f 
  ureal, 
  subdiscoidal 
  joining 
  the 
  discoidal 
  below 
  the 
  middle 
  ; 
  

   submedian 
  cell 
  of 
  hind 
  wings 
  less 
  than 
  half 
  the 
  length 
  of 
  median, 
  transverso-medial 
  

   nervure 
  nearly 
  reaching 
  hind 
  margin. 
  

  

  The 
  male 
  is 
  smaller 
  in 
  size 
  and 
  has 
  the 
  abdomen 
  more 
  slender. 
  

  

  Described 
  from 
  two 
  females 
  and 
  two 
  males 
  (type, 
  allotype 
  and 
  paratypes 
  in 
  the 
  

   collection 
  of 
  the 
  H.S.P.A. 
  Exp. 
  Sta., 
  Honolulu) 
  reared 
  on 
  the 
  larvae 
  of 
  Syagrius 
  

   fidvitarsis, 
  Pasc, 
  at 
  Nimbin, 
  New 
  South 
  Wales, 
  by 
  C. 
  E. 
  Pemberton, 
  April-May 
  1921. 
  

  

  