﻿OBSERVATIONS 
  ON 
  SCALE-INSECTS. 
  

  

  197 
  

  

  chitinised. 
  Pygidium 
  (fig. 
  18, 
  e) 
  unusually 
  narrow 
  and 
  bluntly 
  pointed. 
  Circum- 
  

   genital 
  glands 
  in 
  four 
  groups, 
  the 
  posterior 
  lateral 
  groups 
  placed 
  in 
  a 
  line 
  with 
  the 
  

   vaginal 
  orifice 
  ; 
  formulae 
  of 
  four 
  individuals 
  : 
  — 
  

  

  8-6 
  6-6 
  7-8 
  6-6 
  

  

  6-6 
  6-6 
  5-6 
  6-6 
  

  

  Lobes 
  in 
  three 
  pairs 
  ; 
  median 
  pair 
  somewhat 
  quadrate, 
  broader 
  than 
  long 
  ; 
  2nd 
  

   and 
  3rd 
  pairs 
  slightly 
  shorter 
  than 
  the 
  first 
  and 
  more 
  than 
  twice 
  as 
  broad 
  as 
  long. 
  

   Squamae 
  between 
  the 
  median 
  and 
  2nd 
  lobes, 
  very 
  short 
  ; 
  the 
  second 
  of 
  the 
  

   proximal 
  pair, 
  immediately 
  beyond 
  the 
  third 
  lobe, 
  trifid. 
  Paraphyses 
  in 
  six 
  pairs, 
  

   all 
  rather 
  narrow 
  but 
  clearly 
  defined. 
  Dorsal 
  gland-pores 
  small 
  and 
  few 
  in 
  number, 
  

   with 
  the 
  tubular 
  ducts 
  filiform. 
  

  

  British 
  Guiana 
  : 
  Ayaria 
  Creek, 
  Essequibo, 
  on 
  Lecythis 
  sp., 
  6.x. 
  1918 
  (G. 
  E. 
  Bodkin). 
  

  

  In 
  the 
  structural 
  details 
  of 
  the 
  margin 
  of 
  the 
  pygidium 
  this 
  species 
  very 
  closely 
  

   resembles 
  A. 
  perseae, 
  Comst., 
  but 
  it 
  has 
  a 
  much 
  more 
  strongly 
  pointed 
  pygidium, 
  

   fewer 
  circumgenital 
  glands, 
  and 
  an 
  extra 
  pair 
  of 
  paraphyses 
  ; 
  these 
  characters, 
  taken 
  

   in 
  conjunction 
  with 
  the 
  large 
  metathoracic 
  tubercles 
  and 
  the 
  strongly 
  chitinised 
  

   margin 
  below 
  them, 
  form 
  the 
  salient 
  features 
  of 
  this 
  Coccid. 
  Aspidiotus 
  {Chrysom- 
  

   phalus) 
  paulistus, 
  Hempel, 
  also 
  possesses 
  very 
  distinct 
  cephalo-thoracic 
  tubercles 
  ; 
  

   but 
  in 
  this 
  species 
  there 
  are 
  only 
  two 
  pairs 
  of 
  paraphyses 
  and 
  the 
  pygidium 
  is 
  

   relatively 
  shorter 
  and 
  much 
  more 
  rounded 
  distally. 
  

  

  Aspidiotus 
  (Selenaspidus) 
  articulatus 
  var. 
  magnospinus, 
  nov. 
  

  

  This 
  variety 
  (fig. 
  19, 
  a) 
  differs 
  from 
  typical 
  Aspidiotus 
  articulatus, 
  Morgan, 
  in 
  the 
  

   following 
  details 
  : 
  Cephalothoracic 
  margin 
  finely 
  but 
  distinctly 
  serrated. 
  Thoracic 
  

  

  Fig. 
  19. 
  Aspidiotus 
  articulatus 
  var. 
  magnospinus, 
  

  

  Newst., 
  $ 
  ; 
  a, 
  adult 
  ; 
  b, 
  thoracic 
  spine 
  ; 
  c, 
  fringe 
  

  

  of 
  pygidium 
  ; 
  d, 
  thoracic 
  tubercle 
  of 
  typical 
  $ 
  

  

  articulatus 
  for 
  comparison. 
  

  

  