﻿OBSERVATIONS 
  ON 
  SCALE-INSECTS. 
  

  

  179 
  

  

  British 
  Guiana 
  : 
  " 
  Cattle 
  Trail 
  Survey," 
  on 
  an 
  unknown 
  plant 
  ; 
  ' 
  the 
  insects 
  

   enclosed 
  by 
  ants 
  (Acromyrmex 
  sp.) 
  in 
  small 
  paper 
  nests," 
  1919 
  (A. 
  A. 
  Abraham, 
  

   per 
  G. 
  E. 
  Bodkin). 
  

  

  This 
  species 
  is 
  very 
  near 
  P. 
  comstocki, 
  Kuwana, 
  as 
  denned 
  by 
  Ferris 
  (Leland 
  

   Stanford 
  Jun. 
  Univ. 
  Pub. 
  " 
  The 
  California 
  Species 
  of 
  Mealy 
  Bugs," 
  p. 
  41) 
  

   but 
  differs 
  in 
  having 
  a 
  larger 
  number 
  of 
  cerarian 
  spines 
  and 
  in 
  the 
  form 
  of 
  

   the 
  chitinised 
  area 
  on 
  the 
  ventral 
  surface 
  of 
  the 
  anal 
  lobes. 
  

  

  Taken 
  in 
  association 
  with 
  Lecanium 
  inquilinum, 
  Newst., 
  and 
  L. 
  dejormosum, 
  Newst. 
  

  

  J? 
  

  

  A 
  

  

  a- 
  

  

  \\. 
  

  

  

  * 
  

  

  Fig. 
  3. 
  Pseudococcus 
  inquilinus, 
  Newst., 
  sp. 
  n. 
  $ 
  ; 
  

   a, 
  dorsal 
  and, 
  b, 
  ventral 
  surface 
  of 
  anal 
  lobes 
  ; 
  c, 
  lateral 
  

   abdominal 
  cerarii; 
  d, 
  body 
  setae; 
  e, 
  hair 
  of 
  anal 
  ring. 
  

  

  Pseudococcus 
  perniciosus, 
  Newst. 
  & 
  Willcocks, 
  var. 
  

   Ovisac 
  of 
  female. 
  Arranged 
  in 
  a 
  similar 
  way 
  to 
  those 
  of 
  typical 
  P. 
  perniciosus* 
  

   but 
  the 
  more 
  or 
  less 
  globular 
  masses 
  are 
  smaller. 
  The 
  examples 
  are 
  so 
  badly 
  

   weathered, 
  however, 
  that 
  it 
  is 
  not 
  possible 
  to 
  give 
  details 
  of 
  the 
  structure 
  of 
  the 
  

   individual 
  ovisacs. 
  

  

  Female, 
  adult. 
  * 
  Under 
  pressure 
  of 
  the 
  covering 
  glass 
  the 
  form 
  is 
  narrowly 
  ovate. 
  

   Antennae 
  of 
  seven 
  segments. 
  One 
  pair 
  of 
  cerarii 
  present 
  on 
  the 
  anal 
  lobes 
  

   (fig. 
  4, 
  a), 
  the 
  spines 
  sharp 
  and 
  somewhat 
  slender, 
  with 
  a 
  few 
  obtusely 
  triangular 
  

   gland-pores 
  scattered 
  around 
  them. 
  No 
  typical 
  lateral 
  abdominal 
  cerarii 
  present, 
  

   but 
  their 
  position 
  is 
  indicated 
  by 
  a 
  single, 
  faintly 
  lanceolate 
  spine 
  (fig. 
  4, 
  c), 
  with 
  

   from 
  1 
  to 
  2 
  simple 
  supplementary 
  setae 
  at 
  some 
  distance 
  away 
  from 
  it 
  : 
  the 
  spines 
  are 
  

   traceable 
  in 
  some 
  individuals 
  on 
  the 
  last 
  3-4 
  segments, 
  in 
  others 
  on 
  the 
  penultimate 
  

   segment 
  only. 
  Body 
  spines 
  (fig. 
  4, 
  d) 
  minute, 
  faintly 
  lanceolate, 
  and 
  very 
  scanty 
  

   indeed 
  ; 
  hairs 
  small 
  and 
  also 
  very 
  scanty. 
  Anal 
  lobe 
  setae 
  (fig. 
  4, 
  b) 
  slightly 
  longer 
  

   than 
  the 
  anal 
  ring 
  setae 
  (fig. 
  4, 
  e). 
  Integument 
  very 
  thickly 
  set 
  with 
  gland-pores 
  (fig. 
  

   4, 
  c, 
  c), 
  more 
  especially 
  so 
  along 
  the 
  margin 
  ; 
  these 
  are 
  of 
  three 
  kinds 
  : 
  multilocular, 
  

   tubular 
  and 
  obtusely 
  triangular 
  ; 
  the 
  first-named 
  are 
  arranged 
  in 
  narrow 
  transverse 
  

   bands 
  on 
  the 
  dorsal 
  surface 
  of 
  some 
  of 
  the 
  abdominal 
  segments, 
  elsewhere 
  they 
  are 
  

   irregularly 
  disposed 
  on 
  both 
  surfaces. 
  Length 
  of 
  53 
  adult 
  $$ 
  varying 
  between 
  2'1 
  

   and 
  2*7 
  mm. 
  

  

  * 
  Newstead 
  & 
  WiUcocks. 
  Bull. 
  Ent. 
  lies., 
  i, 
  p. 
  138 
  (1910). 
  

  

  