﻿234 
  E. 
  ERNEST 
  GREEN. 
  — 
  COCCIDAE 
  FROM 
  NORTHERN 
  AUSTRALIA. 
  

  

  shallow 
  polygonal 
  depressions 
  covered 
  by 
  glassy 
  concentrically 
  marked 
  plates 
  of 
  

   colourless 
  secretion. 
  Antennae 
  (fig. 
  2, 
  c-f) 
  small, 
  with 
  confused 
  and 
  often 
  distorted 
  

   joints. 
  Usually 
  6 
  joints 
  can 
  be 
  distinguished, 
  of 
  which 
  the 
  3rd 
  far 
  exceeds 
  in 
  length 
  

   any 
  of 
  the 
  others. 
  Legs 
  altogether 
  absent. 
  Stigma 
  tic 
  area 
  (fig. 
  3) 
  deeply 
  incised, 
  

   the 
  inner 
  margin 
  rounded 
  and 
  thickened. 
  Stigmatic 
  spines 
  three, 
  approximately 
  

   of 
  equal 
  size, 
  stout, 
  round 
  or 
  bluntly 
  pointed 
  at 
  extremity 
  ; 
  the 
  centre 
  spine 
  is 
  set 
  

   further 
  back 
  than 
  the 
  other 
  two, 
  and 
  consequently 
  appears 
  shorter, 
  though 
  occasionally 
  

   it 
  is 
  longer 
  and 
  projects 
  beyond 
  the 
  others. 
  A 
  shallow 
  groove 
  on 
  the 
  ventral 
  surface 
  

   extends 
  from 
  each 
  stigmatic 
  cleft 
  to 
  the 
  corresponding 
  spiracle. 
  Marginal 
  setae 
  

   simple, 
  pointed, 
  about 
  one-third 
  the 
  length 
  of 
  the 
  stigmatic 
  spines. 
  Anal 
  cleft 
  

   occupying 
  approximately 
  one-fifth 
  of 
  the 
  total 
  length 
  of 
  the 
  body. 
  Valves 
  of 
  anal 
  

   operculum 
  triangular, 
  the 
  distal 
  angle 
  acute, 
  the 
  lateral 
  angle 
  obtuse. 
  On 
  the 
  venter, 
  

   immediately 
  in 
  front 
  of 
  the 
  anal 
  ring, 
  are 
  three 
  concentric 
  arches 
  composed 
  of 
  groups 
  of 
  

  

  Fig. 
  3. 
  Lecanium 
  pseudexpansum, 
  sp. 
  nov. 
  ; 
  

   stigmatic 
  area, 
  x 
  600. 
  

  

  small 
  dorsal 
  ceriferous 
  pores, 
  and 
  there 
  are 
  groups 
  of 
  small 
  dorsal 
  pores 
  at 
  intervals 
  

   on 
  the 
  medio-lateral 
  area 
  of 
  the 
  abdomen. 
  Crowded 
  subcircular 
  cells 
  are 
  noticeable 
  

   in 
  the 
  thicker 
  parts 
  of 
  the 
  derm, 
  near 
  the 
  margin. 
  Length, 
  4*25 
  to 
  5*50 
  mm. 
  ; 
  

   breadth, 
  3*50 
  to 
  4 
  mm. 
  

  

  Male 
  puparium 
  glassy, 
  divided 
  by 
  raised 
  fines 
  into 
  18 
  plates, 
  of 
  which 
  three 
  are 
  

   central 
  and 
  fifteen 
  marginal. 
  Length, 
  2 
  to 
  2-50 
  mm. 
  ; 
  breadth, 
  1*25 
  mm. 
  

   " 
  On 
  Pandanus 
  odoratissimus 
  ; 
  Koolpinyah, 
  near 
  Darwin, 
  N.T." 
  

  

  The 
  superficial 
  resemblance 
  of 
  this 
  species 
  to 
  L. 
  expansum 
  is 
  quite 
  remarkable 
  ; 
  

   so 
  much 
  so, 
  that 
  I 
  was 
  at 
  first 
  prepared 
  to 
  accept 
  it 
  as 
  such, 
  without 
  further 
  exami- 
  

   nation. 
  But 
  the 
  simple 
  character 
  of 
  the 
  marginal 
  setae 
  (which 
  are 
  flabelliform 
  in 
  

   expansum) 
  places 
  pseudexpansum 
  in 
  quite 
  another 
  section 
  of 
  the 
  genus. 
  Nor 
  is 
  the 
  

   resemblance 
  purely 
  superficial, 
  for 
  the 
  structure 
  of 
  the 
  antennae, 
  the 
  absence 
  of 
  limbs, 
  

   and 
  the 
  disposition 
  of 
  the 
  pre-anal 
  ceriferous 
  pores, 
  are 
  all 
  common 
  to 
  the. 
  two 
  species. 
  

   The 
  male 
  puparia 
  of 
  the 
  two 
  species 
  are 
  indistinguishable. 
  

  

  