﻿OBSERVATIONS 
  ON 
  SCALE-INSECTS. 
  187 
  

  

  Pulvinaria 
  broad 
  way 
  i 
  var. 
  echinopsidis, 
  no 
  v. 
  

  

  Female, 
  adult. 
  Ovate, 
  usually 
  very 
  slightly 
  narrowed 
  in 
  front. 
  Antennae 
  of 
  eight 
  

   segments 
  ; 
  3rd 
  a 
  little 
  longer 
  than 
  the 
  2nd 
  ; 
  formula 
  3, 
  2, 
  8, 
  1 
  (4, 
  5, 
  6, 
  2) 
  or 
  3, 
  2, 
  8, 
  4 
  

   (5, 
  6, 
  7). 
  Legs 
  robust 
  and 
  relatively 
  long. 
  Lower 
  digitules 
  strongly 
  incrassate 
  

   proximally 
  and 
  broadly 
  dilated 
  distally. 
  Stigma 
  tic 
  clefts 
  (fig. 
  9, 
  a) 
  very 
  shallow 
  ; 
  

   spines 
  three, 
  all 
  of 
  them 
  stout, 
  the 
  middle 
  one 
  usually 
  a 
  little 
  more 
  than 
  twice 
  the 
  

   length 
  of. 
  the 
  laterals. 
  Marginal 
  spines 
  (fig. 
  9, 
  a) 
  set 
  rather 
  closely 
  together 
  and 
  

   of 
  two 
  types 
  — 
  one 
  relatively 
  short 
  and 
  simple, 
  the 
  other 
  longer 
  and 
  slightly 
  divided 
  

  

  Fig. 
  9. 
  Pulvinaria 
  broadwayi 
  var. 
  echinopsidis, 
  Newst., 
  no 
  v., 
  $ 
  ; 
  

   a, 
  stigmatic 
  cleft 
  with 
  marginal 
  and 
  stigmatic 
  spines 
  ; 
  b, 
  anal 
  lobes. 
  

  

  at 
  the 
  tip. 
  Dorsum 
  without 
  glands 
  or 
  cellular 
  structures 
  ; 
  venter 
  crowded 
  with 
  

   glandular 
  tubes, 
  more 
  especially 
  so 
  in 
  the 
  abdominal 
  region. 
  Anal 
  lobes 
  (fig. 
  9, 
  b) 
  

   rather 
  narrow 
  and 
  furnished 
  distally 
  with 
  several 
  long 
  hairs. 
  Anal 
  ring 
  of 
  eight 
  

   hairs, 
  of 
  which 
  one 
  pair 
  is 
  much 
  smaller 
  than 
  the 
  rest. 
  Length, 
  2-1*5 
  ; 
  width, 
  

   1-1*3 
  mm. 
  

  

  Ovisac. 
  More 
  or 
  less 
  rounded 
  and 
  formed 
  of 
  loose 
  and 
  somewhat 
  brittle 
  material, 
  

   at 
  the 
  side 
  of 
  which 
  the 
  shrivelled 
  body 
  of 
  the 
  female 
  rests. 
  Greatest 
  width, 
  

   1*5-3 
  mm. 
  

  

  British 
  Guiana 
  : 
  Botanic 
  Gardens, 
  Georgetown, 
  on 
  Echinopsis 
  latiflora, 
  ix.1918 
  

   (G. 
  E. 
  Bodkin 
  and 
  H. 
  Morrison). 
  

  

  Lecanium 
  subacutum, 
  sp. 
  nov. 
  

  

  Female, 
  adult 
  (fig. 
  10, 
  a). 
  Colour 
  of 
  dead 
  examples 
  pale 
  dusky 
  yellow. 
  Flat 
  and 
  

   very 
  thin 
  ; 
  dorsum 
  wrinkled, 
  the 
  wrinkles 
  at 
  the 
  margin 
  radial. 
  Form 
  long 
  and 
  

   narrow 
  ; 
  extremities 
  subacute 
  ; 
  the 
  length 
  three 
  times 
  as 
  great 
  as 
  the 
  greatest 
  width 
  ; 
  

   one 
  side 
  of 
  the 
  body 
  is 
  usually 
  more 
  or 
  less 
  straight, 
  the 
  other 
  strongly 
  arched. 
  

   Antennae 
  (fig. 
  10, 
  b) 
  of 
  six 
  segments, 
  the 
  third 
  very 
  long, 
  and 
  almost 
  equalling 
  

   the 
  length 
  of 
  the 
  2nd, 
  4th, 
  5th, 
  and 
  6th 
  together. 
  Legs 
  long 
  and 
  slender. 
  Stigmatic 
  

   clefts 
  (fig. 
  10, 
  c) 
  shallow 
  ; 
  spines 
  three, 
  all 
  of 
  them 
  very 
  stout 
  and 
  bluntly 
  pointed 
  ; 
  

   the 
  central 
  one 
  rather 
  flattened 
  and 
  more 
  than 
  twice 
  the 
  length 
  of 
  the 
  laterals. 
  

   Marginal 
  spines 
  (fig. 
  10, 
  c) 
  simple, 
  rather 
  stout 
  and 
  strongly 
  curved 
  backwards 
  ; 
  

   they 
  are 
  placed 
  very 
  closely 
  together, 
  so 
  that 
  the 
  tip 
  of 
  each 
  spine 
  almost 
  reaches 
  

   the 
  strongly 
  curved 
  portion 
  of 
  the 
  spine 
  below 
  it. 
  Anal 
  lobes 
  (fig. 
  10, 
  d) 
  long 
  and 
  

   narrow 
  ; 
  the 
  length 
  equalling 
  that 
  of 
  the 
  3rd 
  segment 
  of 
  the 
  antennae. 
  Dorsum 
  

   with 
  numerous 
  large 
  circular 
  gland-pores 
  (fig. 
  10, 
  e, 
  e) 
  having 
  strongly 
  chitinised 
  rims 
  

   and 
  fine 
  granular 
  centres 
  ; 
  they 
  are 
  irregularly 
  scattered 
  over 
  a 
  relatively 
  broad 
  

   area 
  between 
  the 
  anal 
  lobes 
  and 
  the 
  antennae. 
  Dorsal 
  spines 
  (fig. 
  10, 
  e, 
  e) 
  short, 
  

   stout, 
  and 
  bluntly 
  pointed. 
  Dermal 
  cells 
  absent. 
  Submarginal 
  tubercles 
  in 
  two 
  

  

  