﻿OBSERVATIONS 
  ON 
  SCALE-INSECTS. 
  

  

  189 
  

  

  (fig. 
  11, 
  a) 
  presents 
  the 
  following 
  morphogical 
  details 
  : 
  Dorsum 
  divided 
  into 
  five 
  

   bilateral 
  plates 
  — 
  two 
  cephalic, 
  three 
  thoracic, 
  and 
  two 
  abdominal 
  ; 
  the 
  sutures 
  

   separating 
  the 
  cephalic 
  from 
  the 
  first 
  thoracic 
  plates 
  terminating 
  at 
  the 
  stigmata 
  ; 
  the 
  

   other 
  sutures 
  are 
  connected 
  with 
  the 
  mesal 
  one 
  (these 
  sutures 
  in 
  the 
  dried 
  examples 
  

   appear 
  as 
  well 
  defined 
  narrow 
  ridges). 
  Mesal 
  suture 
  between 
  the 
  anal 
  lobes 
  and 
  the 
  

   rostrum 
  with 
  large 
  circular 
  gland-pores 
  (fig. 
  11, 
  b). 
  Antennae 
  of 
  six 
  segments; 
  

   the 
  third 
  almost 
  as 
  long 
  as 
  the 
  1st, 
  4th, 
  5th 
  and 
  6th 
  together. 
  Legs 
  well 
  developed 
  ; 
  

   lower 
  digitules 
  large 
  and 
  strongly 
  incrassate. 
  Anal 
  lobes 
  (fig. 
  11, 
  c) 
  somewhat 
  

   triangular 
  ; 
  inner 
  margin 
  longest 
  ; 
  distal 
  margin 
  shortest 
  ; 
  the 
  sclerites 
  beneath 
  

   (fig. 
  11, 
  d, 
  d) 
  stout 
  and 
  somewhat 
  spine-like. 
  Anal 
  cleft 
  deep,and 
  apparently 
  partly 
  

   fused 
  but 
  separable. 
  Stigmatic 
  clefts 
  (fig. 
  11, 
  e, 
  e) 
  small, 
  but 
  deeply 
  invaginated; 
  

   spines 
  three, 
  very 
  robust, 
  and 
  blunt 
  at 
  the 
  tips. 
  Marginal 
  spines 
  (fig. 
  11 
  e. 
  e) 
  simple, 
  

   and 
  set 
  rather 
  widely 
  apart. 
  Submarginal 
  gland 
  pores 
  (fig. 
  11,/) 
  very 
  small, 
  number- 
  

   ing 
  from 
  six 
  to 
  eight 
  on 
  either 
  side. 
  Oval 
  cells 
  can 
  be 
  seen, 
  near 
  the 
  margin, 
  in 
  old 
  

   and 
  well 
  stained 
  examples. 
  Length, 
  3 
  "4-3 
  '7 
  ; 
  width, 
  3 
  "2-3 
  *7* 
  mm. 
  

  

  'V 
  

  

  •s 
  e 
  

  

  p,v)'mi 
  

  

  

  •K 
  

  

  

  m 
  

  

  >*v 
  

  

  Fig. 
  11. 
  Lecanium 
  (Eucalymnatus) 
  decemplex, 
  Newst., 
  sp. 
  n., 
  

  

  £ 
  ; 
  a, 
  adult 
  $ 
  ; 
  b, 
  mesal 
  gland-pores 
  ; 
  c, 
  anal 
  lobe 
  ; 
  d, 
  d, 
  sclerites 
  

  

  of 
  anal 
  lobes 
  ; 
  e, 
  e, 
  stigmatic 
  clefts 
  and 
  spines. 
  

  

  Male 
  Puparium. 
  Broadly 
  ovate 
  ; 
  divided 
  into 
  eleven 
  plates 
  : 
  two 
  median, 
  one 
  

   cephalic, 
  and 
  four 
  bilateral 
  ; 
  the 
  lateral 
  plates 
  with 
  partial 
  subdivisions. 
  Length, 
  

   1*8 
  ; 
  width, 
  14 
  mm. 
  

  

  British 
  Guiana 
  : 
  Ayaria, 
  Thuraka 
  Lake, 
  Ituribisci 
  Creek, 
  Essequebo, 
  on 
  leaves 
  

   of 
  Lecythis 
  sp., 
  6.X.1918 
  (G. 
  E. 
  Bodkin). 
  

  

  This 
  somewhat 
  remarkable 
  species 
  evidently 
  belongs 
  to 
  the 
  subgenus 
  Eucalymnatus. 
  

   its 
  distinguishing 
  features 
  being 
  the 
  small 
  number 
  of 
  plates 
  into 
  which 
  the 
  dorsum 
  is 
  

   divided. 
  

  

  Lecanium 
  inquilinum, 
  sp., 
  nov. 
  j 
  

  

  Female, 
  adult. 
  Ovate 
  or 
  elongate 
  and 
  highly 
  convex 
  ; 
  more 
  or 
  less 
  circular 
  when 
  

   mounted 
  under 
  pressure. 
  Integument 
  pale 
  brown, 
  but 
  thin 
  and 
  transparent 
  after 
  

   maceration 
  in 
  KOH. 
  Antennae 
  (fig. 
  12, 
  a) 
  of 
  eight 
  segments. 
  Legs 
  relatively 
  robust 
  

  

  