﻿98 
  CHAS. 
  K. 
  BRAIN. 
  

  

  Pygidium 
  (fig. 
  177) 
  with 
  one 
  pair 
  of 
  lobes, 
  which 
  are 
  close 
  together 
  on 
  their 
  inner 
  

   surface, 
  their 
  outer 
  edges 
  being 
  crenulate. 
  Between 
  the 
  median 
  lobes 
  there 
  are 
  two 
  

   large 
  spines 
  but 
  no 
  plates. 
  At 
  the 
  outer 
  margins 
  there 
  is 
  also 
  a 
  large 
  spine, 
  then 
  a 
  

   gland 
  from 
  which 
  arises 
  a 
  small 
  sharply 
  pointed 
  plate, 
  then 
  a 
  very 
  small 
  rudimentary 
  

   lobe, 
  which 
  is 
  pointed 
  and 
  chitinous 
  and 
  in 
  some 
  cases 
  seems 
  to 
  be 
  composed 
  of 
  two 
  

   lobules 
  of 
  which 
  the 
  outer 
  is 
  the 
  smaller. 
  These 
  are 
  followed 
  by 
  a 
  long 
  simple 
  dagger- 
  

   shaped 
  plate, 
  then 
  a 
  large 
  gland 
  opening 
  and 
  another 
  plate. 
  Beyond 
  this 
  the 
  margin 
  

   appears 
  thickened 
  like 
  a 
  minute 
  rudimentary 
  lobe, 
  beyond 
  which 
  there 
  are 
  two 
  

   additional 
  pairs 
  of 
  plates. 
  There 
  are 
  a 
  few 
  plates 
  on 
  the 
  margin 
  of 
  the 
  first 
  abdominal 
  

   segment 
  from 
  the 
  pygidium 
  in 
  addition 
  to 
  the 
  glands. 
  Extending 
  into 
  the 
  pygidium 
  

   are 
  three 
  pairs 
  of 
  chitinous 
  thickenings. 
  Circumgenital 
  glands 
  in 
  5 
  groups, 
  of 
  which 
  

   the 
  median 
  and 
  anterior 
  laterals 
  are 
  often 
  almost 
  united 
  into 
  a 
  bow. 
  

  

  7—11 
  

  

  10—14 
  10—14 
  

  

  6—9 
  6—9 
  

  

  Remarks. 
  A 
  large 
  percentage 
  of 
  the 
  $ 
  scales 
  showed 
  the 
  circular 
  exit 
  holes 
  of 
  

   some 
  Hymenopterous 
  parasite. 
  

  

  Habitat 
  : 
  On 
  twigs 
  of 
  lilac, 
  Fort 
  Beaufort, 
  C.P. 
  ; 
  collected 
  by 
  C.P. 
  Lounsbury, 
  

   June 
  1913. 
  

  

  Collection 
  No. 
  : 
  263. 
  

  

  152. 
  Chionaspis 
  leucadendri, 
  sp. 
  n. 
  (Plate 
  v, 
  figs. 
  166, 
  171). 
  

  

  Scale 
  of 
  adult 
  $ 
  about 
  2*6 
  mm. 
  long, 
  white, 
  smooth, 
  slightly 
  glossy, 
  not 
  very 
  convex, 
  

   long 
  and 
  narrow, 
  somewhat 
  widened 
  and 
  flattened 
  behind. 
  Exuviae 
  brownish 
  ; 
  

   second 
  exuviae 
  covered 
  by 
  a 
  very 
  thin 
  layer 
  of 
  secretion. 
  

   $ 
  scales 
  chiefly 
  on 
  stems 
  ; 
  $ 
  puparia 
  most 
  common 
  on 
  leaves. 
  

  

  (J 
  puparium 
  comparatively 
  large, 
  white, 
  flat, 
  slightly 
  roughened, 
  not 
  carinated, 
  

   with 
  pale 
  exuviae, 
  which 
  are 
  sometimes 
  ± 
  greenish 
  yellow 
  in 
  colour. 
  

  

  Adult 
  $, 
  mounted, 
  about 
  1*4 
  mm. 
  long, 
  narrow 
  in 
  front, 
  but 
  quickly 
  widening 
  

   to 
  about 
  middle, 
  whence 
  it 
  gradually 
  narrows 
  again 
  to 
  the 
  median 
  lobes. 
  Abdominal 
  

   segments 
  well 
  indicated 
  but 
  not 
  prominently 
  produced. 
  Body 
  moderately 
  chitinised, 
  

   the 
  mouth-parts, 
  lobes, 
  and 
  margin 
  of 
  pygidium 
  denser. 
  The 
  four 
  abdominal 
  seg- 
  

   ments 
  adjoining 
  the 
  pygidium 
  have 
  their 
  margins 
  with 
  a 
  few 
  gland-pores 
  and 
  a 
  number 
  

   of 
  short, 
  stout, 
  very 
  acute 
  spine-glands. 
  These, 
  seen 
  in 
  optical 
  section, 
  appear 
  like 
  

   rose-spines, 
  but 
  the 
  points 
  are 
  often 
  long, 
  slender 
  and 
  curved. 
  They 
  occur 
  chiefly 
  

   on 
  the 
  margin, 
  but 
  extend 
  in 
  scattered 
  formation 
  some 
  distance 
  within 
  the 
  edge. 
  

  

  P 
  x 
  small, 
  spine-like. 
  ~L 
  1 
  rounded, 
  striate, 
  arising 
  from 
  the 
  thickened 
  margin 
  of 
  the 
  

   pygidium. 
  P 
  2 
  -6 
  long, 
  dagger-shaped. 
  Circumgenital 
  glands 
  in 
  5 
  groups, 
  which 
  are 
  

   almost 
  contiguous, 
  in 
  the 
  form 
  of 
  a 
  horse-shoe 
  : 
  

  

  4—7 
  

   11—18 
  11—18 
  

   26—32 
  26—32 
  

  

  Habitat 
  : 
  On 
  silver-leaf 
  tree 
  (Leucadendron 
  argenteum), 
  National 
  Botanic 
  Gardens, 
  

   Kirstenbosch, 
  Capetown 
  ; 
  collected 
  by 
  the 
  late 
  Professor 
  H. 
  H. 
  W. 
  Pearson, 
  

   August 
  1914. 
  

  

  Collection 
  No. 
  : 
  145. 
  

  

  