﻿180 
  

  

  ROBERT 
  NEWSTEAD. 
  

  

  Larva. 
  Anal 
  lobes 
  with 
  a 
  pair 
  of 
  slightly 
  lanceolate 
  spines 
  ; 
  setae 
  longer 
  than 
  

   those 
  of 
  the 
  anal 
  ring. 
  Dorsal 
  spines 
  minute, 
  similar 
  in 
  shape 
  to 
  those 
  on 
  the 
  anal 
  

   lobes. 
  

  

  British 
  East 
  Africa 
  : 
  Kabete, 
  on 
  coffee, 
  November 
  1918. 
  " 
  Coffee 
  bush 
  infected 
  

   in 
  the 
  lab. 
  has 
  been 
  killed 
  by 
  this 
  scale 
  " 
  (F. 
  W. 
  Dry, 
  for 
  T. 
  J. 
  Anderson). 
  

  

  Typical 
  examples 
  of 
  %. 
  perniciosus, 
  N. 
  & 
  W., 
  have 
  from 
  5-6 
  pairs 
  of 
  lanceolate 
  

   cerarian 
  spines 
  on 
  the 
  distal 
  segments 
  of 
  the 
  abdomen, 
  with 
  2-3 
  obtusely 
  triangular 
  

   pores 
  scattered 
  near 
  them 
  ; 
  and 
  the 
  body 
  spines, 
  though 
  smaller 
  than 
  the 
  cerarian 
  

   spines, 
  are 
  relatively 
  much 
  larger, 
  and 
  also 
  much 
  more 
  frequent 
  than 
  are 
  those 
  in 
  

   the 
  variety 
  from 
  coffee 
  at 
  Kabete. 
  Moreover 
  P. 
  perniciosus 
  is 
  much 
  larger, 
  measuring 
  

   from 
  3-4 
  mm. 
  

  

  P.pernicfosus, 
  var. 
  

  

  P. 
  filamentosus. 
  

  

  Fig. 
  4. 
  Pseudococcus 
  perniciosus, 
  N. 
  & 
  W., 
  var., 
  $ 
  ; 
  a, 
  b, 
  dorsal 
  and 
  ventral 
  

   aspect 
  of 
  the 
  anal 
  lobes 
  ; 
  c, 
  lateral 
  abdominal 
  cerarii 
  ; 
  dd, 
  gland-pores 
  ; 
  e, 
  hair 
  of 
  

   anal 
  ring. 
  Pseudococcus 
  filamentosus, 
  Ckll., 
  $; 
  /, 
  gland-pores 
  ; 
  gg, 
  lateral 
  abdominal 
  

  

  cerarii. 
  

  

  Brain 
  * 
  has 
  sunk 
  P. 
  perniciosus 
  as 
  a 
  synonym 
  of 
  P. 
  filamentosus, 
  Ckll., 
  without 
  

   giving 
  reasons 
  for 
  so 
  doing 
  ; 
  this 
  action 
  has 
  led 
  me 
  to 
  re-examine 
  examples 
  of 
  the 
  

   latter 
  (part 
  of 
  the 
  type 
  lot 
  kindly 
  presented 
  to 
  me 
  by 
  Professor 
  T. 
  D. 
  A. 
  Cockerell 
  

   in 
  1892) 
  and 
  I 
  find 
  that 
  it 
  differs 
  to 
  a 
  marked 
  degree 
  from 
  P. 
  perniciosus 
  in 
  having 
  

   very 
  few 
  gland-pores 
  (fig. 
  4,/), 
  relatively 
  shorter 
  anal 
  lobe 
  setae 
  and 
  small 
  groups 
  

   of 
  obtusely 
  triangular 
  pores 
  round 
  the 
  cerarian 
  spines 
  (fig. 
  4, 
  g, 
  g). 
  Some 
  of 
  the 
  

   tubular 
  ducts 
  of 
  the 
  dorsum 
  are 
  also 
  much 
  shorter 
  and 
  many 
  of 
  them 
  are 
  accompanied 
  

   by 
  2-3 
  obtusely 
  triangular 
  pores. 
  Clearly 
  therefore 
  P. 
  perniciosus 
  is 
  specifically 
  

   distinct 
  from 
  P. 
  filamentosus, 
  and 
  the 
  former 
  name 
  must 
  be 
  retained. 
  

  

  * 
  Brain, 
  C. 
  K. 
  Trans. 
  R. 
  Soc. 
  S. 
  Africa, 
  v, 
  pt. 
  2, 
  p. 
  99 
  (1915). 
  

  

  