﻿172 
  GUY 
  A. 
  K. 
  MARSHALL. 
  

  

  without 
  any 
  median 
  carina 
  (except 
  for 
  a 
  trace 
  anteriorly), 
  and 
  the 
  feeble 
  lateral 
  

   carinae 
  converging 
  to 
  a 
  distinct 
  point 
  at 
  the 
  base 
  ; 
  the 
  lateral 
  area 
  with 
  two 
  rows 
  of 
  

   deep 
  setigerous 
  punctures, 
  but 
  lacking 
  the 
  usual 
  deep 
  furrow 
  above 
  the 
  scrobe 
  ; 
  the 
  

   apical 
  area 
  very 
  shiny 
  and 
  distinctly 
  but 
  unevenly 
  punctate. 
  Antennae 
  piceous 
  ; 
  

   the 
  funicle 
  with 
  joint 
  2 
  longer 
  than 
  1, 
  the 
  others 
  all 
  a 
  little 
  longer 
  than 
  broad. 
  

   Prothorax 
  somewhat 
  transverse, 
  strongly 
  rounded 
  at 
  the 
  sides, 
  broadest 
  at 
  the 
  middle, 
  

   and 
  the 
  anterior 
  dorsal 
  margin 
  subtruncate 
  ; 
  the 
  whole 
  surface 
  set 
  with 
  large 
  rounded 
  

   tubercles 
  of 
  unequal 
  size, 
  most 
  of 
  them 
  having 
  a 
  m'nute 
  shiny 
  granule 
  at 
  the 
  summit, 
  

   but 
  without 
  the 
  usual 
  two 
  higher 
  tubercles 
  in 
  the 
  middle 
  ; 
  the 
  dorsal 
  outline 
  rising 
  

   gradually 
  from 
  the 
  apex 
  to 
  well 
  behind 
  the 
  middle, 
  then 
  falling 
  rapidly, 
  the 
  base 
  being 
  

   well 
  below 
  the 
  level 
  of 
  the 
  apex. 
  Elytra 
  slightly 
  pyriform, 
  shallowly 
  constricted 
  at 
  

   the 
  base, 
  then 
  very 
  gradually 
  widening 
  posteriorly, 
  being 
  widest 
  at 
  three-fourths 
  the 
  

   length, 
  the 
  basal 
  angles 
  projecting 
  laterally 
  ; 
  the 
  punctures 
  very 
  large 
  and 
  deep, 
  and 
  

   in 
  fairly 
  regular 
  rows 
  even 
  on 
  the 
  disk 
  ; 
  intervals 
  3, 
  5 
  and 
  7 
  more 
  or 
  less 
  tuberculate, 
  

   the 
  others 
  plane 
  and 
  not 
  even 
  granulate, 
  all 
  the 
  tubercles 
  bearing 
  a 
  few 
  minute 
  shiny 
  

   granules 
  ; 
  interval 
  3 
  with 
  a 
  large 
  elongate 
  basal 
  tubercle 
  (the 
  basal 
  margin 
  being 
  

   there 
  produced 
  slightly 
  forwards), 
  followed 
  by 
  three 
  subtuberculate 
  groups 
  of 
  granules, 
  

   then 
  a 
  large 
  rounded 
  tubercle 
  at 
  the 
  top 
  of 
  the 
  declivity, 
  and 
  an 
  elongate 
  elevation 
  on 
  

   the 
  declivity 
  itself 
  ; 
  intervals 
  5 
  and 
  7 
  with 
  the 
  tubercles 
  well 
  marked 
  behind, 
  but 
  

   becoming 
  much 
  reduced 
  or 
  obsolete 
  towards 
  the 
  base. 
  Legs 
  almost 
  smooth, 
  the 
  femora 
  

   with 
  some 
  very 
  shallow 
  punctures 
  at 
  the 
  apex 
  and 
  base, 
  and 
  with 
  sparse, 
  fulvous 
  setae, 
  

   and 
  an 
  ill-defined 
  ring 
  of 
  paler 
  setae 
  on 
  the 
  thickened 
  portion 
  ; 
  the 
  tibiae 
  with 
  dense, 
  

   raised 
  squamiform 
  fulvous 
  setae 
  ; 
  the 
  tarsi 
  black, 
  and 
  with 
  similar 
  setae 
  instead 
  of 
  

   the 
  usual 
  fine 
  hairs. 
  

  

  Length, 
  8-5 
  mm. 
  ; 
  breadth, 
  3-5 
  mm. 
  

  

  New 
  South 
  Wales 
  : 
  Nimbin, 
  20. 
  iv. 
  1921 
  (Pemberton) 
  . 
  

  

  Described 
  from 
  a 
  single 
  male. 
  

  

  This 
  is 
  the 
  largest 
  species 
  of 
  the 
  genus 
  and 
  differs 
  from 
  all 
  the 
  others 
  in 
  the 
  following 
  

   points 
  : 
  — 
  The 
  basal 
  constriction 
  of 
  the 
  rostrum 
  and 
  the 
  absence 
  of 
  the 
  deep 
  lateral 
  

   furrow 
  ; 
  the 
  comparatively 
  smooth 
  legs, 
  and 
  the 
  dense 
  squamiform 
  setae 
  on 
  the 
  

   tibiae 
  and 
  tarsi. 
  

  

  In 
  the 
  genus 
  Syagrius 
  the 
  genitalia 
  of 
  both 
  sexes 
  afford 
  good 
  diagnostic 
  characters 
  

   (cf. 
  Plates 
  vii, 
  viii). 
  In 
  the 
  males 
  the 
  median 
  lobe 
  is 
  in 
  the 
  form 
  of 
  a 
  shallow 
  trough 
  

   with 
  only 
  the 
  lateral 
  and 
  anterior 
  edges 
  heavily 
  chitinised 
  ; 
  the 
  dorsal 
  surface 
  of 
  the 
  

   tube 
  is 
  entirely 
  membranous, 
  and 
  on 
  the 
  ventral 
  portion 
  there 
  is 
  a 
  lightly 
  chitinised, 
  

   elliptical 
  or 
  ovate 
  area, 
  above 
  which 
  lie 
  two 
  short, 
  slightly 
  curved 
  rods, 
  which 
  are 
  

   pointed 
  posteriorly 
  ; 
  the 
  median 
  struts 
  are 
  continuous 
  with 
  the 
  lateral 
  margins 
  of 
  

   the 
  median 
  lobe, 
  thin 
  and 
  sinuate 
  dorso-ventrally 
  at 
  the 
  junction 
  with 
  the 
  lobe, 
  but 
  

   compressed 
  distally 
  and 
  more 
  or 
  less 
  spatulate 
  at 
  the 
  apex 
  ; 
  the 
  length 
  of 
  the 
  struts 
  

   in 
  relation 
  to 
  that 
  of 
  the 
  median 
  lobe 
  is 
  as 
  follows 
  in 
  the 
  various 
  species 
  (using 
  the 
  same 
  

   unit 
  of 
  measurement 
  throughout, 
  8units=l 
  mm.) 
  : 
  — 
  S.fulvitarsis, 
  8:5; 
  5. 
  intrudens, 
  

   11:8; 
  S. 
  costicollis, 
  10 
  : 
  9 
  ; 
  S. 
  pembertoni, 
  16 
  : 
  8. 
  The 
  uneverted 
  sac 
  extends 
  almost 
  

   to 
  the 
  apex 
  of 
  the 
  struts 
  in 
  intrudens 
  and 
  fulvitarsis, 
  whereas 
  in 
  the 
  other 
  two 
  species 
  

   it 
  reaches 
  to 
  about 
  the 
  middle 
  of 
  the 
  struts 
  ; 
  but 
  the 
  most 
  striking 
  specific 
  differences 
  

   are 
  to 
  be 
  found 
  in 
  the 
  very 
  large 
  and 
  complex 
  transfer 
  apparatus 
  at 
  the 
  end 
  of 
  the 
  

   sac, 
  which 
  are 
  well 
  shown 
  in 
  Mr. 
  Tooling's 
  excellent 
  drawings. 
  The 
  spiculum 
  is 
  of 
  the 
  

   usual 
  form 
  — 
  a 
  stout 
  rod, 
  with 
  a 
  Y-shaped 
  fork 
  at 
  the 
  attached 
  end, 
  and 
  the 
  free 
  end 
  

   strongly 
  curved 
  and 
  somewhat 
  spatulate. 
  The 
  eighth 
  ventrite 
  is 
  lightly 
  chitinised, 
  

   with 
  a 
  hyaline 
  median 
  stripe, 
  and 
  the 
  basal 
  margin 
  is 
  very 
  deeply 
  bisinuate. 
  

  

  In 
  the 
  female 
  genital 
  tube 
  the 
  vaginal 
  palps 
  are 
  of 
  quite 
  normal 
  form 
  and 
  extremely 
  

   similar 
  in 
  the 
  three 
  species 
  examined 
  [fulvitarsis, 
  pembertoni 
  and 
  costicollis), 
  and 
  in 
  

   the 
  specimen 
  of 
  fulvitarsis 
  figured 
  (PL 
  viii, 
  fig. 
  5) 
  the 
  palps 
  are 
  0-1 
  mm. 
  long 
  and 
  the 
  

   supporting 
  plates 
  0-75 
  mm. 
  In 
  the 
  bursa 
  copulatrix 
  is 
  a 
  more 
  or 
  less 
  complicated 
  

   chitinous 
  structure, 
  which 
  differs 
  markedly 
  in 
  each 
  species 
  (PI. 
  viii, 
  figs. 
  2-4), 
  its 
  

  

  