﻿THE 
  COCCIDAE 
  OF 
  SOUTH 
  AFRICA. 
  101 
  

  

  156. 
  Chionaspis 
  (Dinaspis) 
  diosmae, 
  sp. 
  n. 
  (Plate 
  v, 
  fig. 
  167). 
  

  

  Insects 
  ± 
  clustered 
  on 
  leaves 
  of 
  host-plant, 
  especially 
  on 
  the 
  upper 
  surface. 
  

  

  Adult 
  $ 
  scale 
  about 
  2*2 
  mm. 
  long, 
  comparatively 
  broad, 
  moderately 
  convex, 
  silky 
  

   in 
  appearance, 
  with 
  conspicuous 
  growth 
  fines. 
  First 
  exuviae 
  yellow 
  ; 
  second 
  exuviae 
  

   brownish, 
  covered 
  by 
  a 
  dense 
  layer 
  of 
  secretion 
  similar 
  to 
  remainder 
  of 
  scale. 
  The 
  

   layer 
  covering 
  the 
  second 
  exuviae 
  is 
  very 
  easily 
  removed 
  and 
  carries 
  the 
  small 
  first 
  

   exuviae 
  with 
  it. 
  Owing 
  to 
  this 
  fact 
  many 
  of 
  the 
  specimens 
  appear 
  to 
  have 
  brownish, 
  

   shining 
  pellicles. 
  

  

  Adult 
  5 
  viviparous 
  ; 
  mounted 
  specimens 
  contain 
  many 
  well-developed 
  larvae. 
  

  

  Adult 
  9, 
  mounted, 
  about 
  1*6 
  mm. 
  long 
  and 
  0*8 
  mm. 
  broad 
  ; 
  widest 
  about 
  middle 
  

   and 
  narrowing 
  to 
  each 
  end. 
  Body 
  moderately 
  chitinised. 
  The 
  pygidial 
  margin 
  is 
  

   quite 
  different 
  from 
  that 
  of 
  any 
  other 
  species 
  of 
  Dinaspis 
  known 
  to 
  me. 
  The 
  median 
  

   notch 
  is 
  angular, 
  with 
  narrow 
  straight 
  thickened 
  margins, 
  below 
  which 
  the 
  median 
  

   lobes 
  project. 
  Owing 
  to 
  this 
  fact 
  the 
  appearance 
  of 
  the 
  lobes 
  varies 
  greatly 
  according 
  

   to 
  how 
  the 
  specimens 
  are 
  mounted, 
  L 
  x 
  in 
  some 
  cases 
  appearing 
  quite 
  distinctly, 
  in 
  

   others 
  being 
  almost 
  invisible. 
  There 
  are 
  apparently 
  no 
  plates. 
  Pygidium 
  as 
  

   illustrated 
  (fig. 
  167). 
  Circumgenital 
  glands 
  0. 
  

  

  Habitat 
  : 
  On 
  buchu 
  (Diosma 
  crenata), 
  Wellington, 
  C. 
  P. 
  ; 
  collected 
  by 
  C. 
  P. 
  v. 
  d. 
  

   Merwe, 
  November 
  1904 
  (Cape 
  No. 
  : 
  1554). 
  

  

  Collection 
  No. 
  : 
  147. 
  

  

  157. 
  Chionaspis 
  (Dinaspis) 
  lounsburyi 
  (Leonardi) 
  (Plate 
  v, 
  fig. 
  172). 
  

   Dinaspis 
  lounsburyi, 
  Leon., 
  Bol. 
  R. 
  Sc. 
  Agr. 
  Portici, 
  p. 
  216, 
  1914. 
  

   Chionaspis 
  capensis, 
  Newst., 
  Bull. 
  Ent. 
  Res. 
  vii, 
  p. 
  378, 
  1917. 
  

  

  Scale 
  of 
  adult 
  $ 
  about 
  2mm. 
  long, 
  elongate, 
  generally 
  straight, 
  but 
  varying 
  in 
  shape 
  

   according 
  to 
  the 
  position 
  on 
  the 
  plant, 
  condition 
  of 
  crowding, 
  etc. 
  On 
  straight 
  stems 
  

   the 
  sides 
  of 
  the 
  scale 
  are 
  ± 
  parallel 
  from 
  the 
  end 
  of 
  the 
  second 
  exuviae 
  to 
  beyond 
  the 
  

   middle, 
  where 
  it 
  becomes 
  slightly 
  broadened 
  with 
  the 
  hind 
  margin 
  broadly 
  rounded. 
  

   Other 
  specimens 
  situated 
  in 
  the 
  angles 
  of 
  thorns, 
  etc., 
  are 
  much 
  shorter 
  and 
  broader, 
  

   sometimes 
  almost 
  as 
  broad 
  as 
  long. 
  Colour 
  of 
  scale 
  white 
  ; 
  first 
  exuviae 
  bronze 
  to 
  

   bronze-brown 
  ; 
  second 
  exuviae 
  brown, 
  slightly 
  pointed 
  behind. 
  

  

  Puparium 
  of 
  (J 
  about 
  # 
  8 
  mm. 
  long, 
  white, 
  non-carinated, 
  with 
  orange 
  pellicles. 
  

   Posterior 
  margin 
  of 
  puparium 
  broadly 
  rounded, 
  opening 
  by 
  the 
  upper 
  part 
  splitting 
  

   from 
  the 
  lower 
  so 
  that 
  the 
  dorsal 
  flap 
  is 
  exactly 
  like 
  the 
  lower 
  one. 
  

  

  Adult 
  $ 
  viviparous 
  ; 
  when 
  mounted, 
  elongate. 
  Anterior 
  part 
  suddenly 
  narrowed 
  

   and 
  rounded 
  in 
  front, 
  paler 
  yellow 
  ; 
  median 
  portion 
  of 
  body 
  darker 
  yellow, 
  wider, 
  

   with 
  almost 
  parallel 
  sides 
  ; 
  posterior 
  extremity 
  broadly 
  rounded. 
  The 
  free 
  abdominal 
  

   segments 
  are 
  broadly 
  rounded 
  at 
  the 
  margins. 
  Antennal 
  tubercle 
  small, 
  with 
  two 
  

   setae 
  of 
  medium 
  length 
  and 
  thickness. 
  Pygidium 
  as 
  illustrated 
  (fig. 
  172). 
  Circum- 
  

   genital 
  glands 
  0. 
  

  

  Habitat 
  : 
  On 
  stems 
  and 
  leaves 
  of 
  native 
  spiny 
  plant 
  (Gymnospora 
  buxifolia) 
  ; 
  

   extremely 
  common 
  around 
  Pretoria 
  and 
  also 
  received 
  from 
  Umtali, 
  Rhodesia 
  (sent 
  by 
  

   R. 
  Lowe 
  Thompson, 
  of 
  Salisbury). 
  

  

  Collection 
  No. 
  : 
  251. 
  

  

  