﻿186 
  

  

  EOBERT 
  NEWSTEAD. 
  

  

  Pulvinaria 
  brevicornis, 
  sp. 
  nov. 
  

  

  Female, 
  adult. 
  More 
  or 
  less 
  oval 
  in 
  outline 
  and 
  highly 
  convex, 
  or 
  sub-hemispherical 
  ; 
  

   generally 
  with 
  two 
  longitudinal 
  rows 
  of 
  rather 
  deep 
  pits, 
  one 
  on 
  each 
  side 
  of 
  the 
  

   median 
  line. 
  Colour, 
  in 
  alcohol, 
  varying 
  from 
  pale 
  buff 
  to 
  pale 
  castaneous 
  ; 
  some 
  

   are 
  unicolorous, 
  others 
  with 
  two 
  interrupted 
  longitudinal 
  black 
  lines 
  following 
  the 
  

   course 
  of 
  the 
  pits, 
  the 
  outer 
  line, 
  in 
  some 
  examples, 
  giving 
  off 
  lateral 
  lines 
  on 
  the 
  

   abdominal 
  segments. 
  Integument 
  thin. 
  Antennae 
  (fig. 
  8, 
  a) 
  relatively 
  very 
  short 
  

   and 
  robust, 
  equal 
  in 
  length 
  to 
  the 
  anterior 
  tibio-tarsal 
  segments 
  together 
  ; 
  of 
  6 
  

   segments 
  (the 
  articulations 
  somewhat 
  ill-defined 
  in 
  some 
  examples) 
  ; 
  5th 
  and 
  6th 
  

   each 
  with 
  a 
  rather 
  long 
  slender 
  spine. 
  Legs 
  (fig. 
  8, 
  b) 
  short 
  and 
  very 
  robust. 
  

   Stigmatic 
  clefts 
  obsolete 
  ; 
  spines 
  three 
  (fig. 
  8, 
  c), 
  stout, 
  the 
  central 
  one 
  generally 
  slightly 
  

  

  c 
  

  

  Fig. 
  8. 
  Pulvinaria 
  brevicornis, 
  Newst., 
  sp. 
  n., 
  $ 
  ; 
  a, 
  antenna 
  ; 
  

   b, 
  leg 
  ; 
  c, 
  Cj, 
  stigmatic 
  and 
  marginal 
  spines 
  ; 
  d, 
  anal 
  lobes 
  ; 
  e, 
  pre 
  anal 
  

   gland-pores 
  ; 
  f, 
  ventral 
  tubular 
  ducts 
  ; 
  g, 
  stigmatic 
  gland-pores. 
  

   Male, 
  pronymph 
  : 
  h, 
  antenna 
  ; 
  i, 
  leg. 
  

  

  longer 
  than 
  the 
  laterals, 
  but 
  in 
  some 
  instances 
  it 
  is 
  of 
  the 
  same 
  length 
  as 
  the 
  others. 
  

   Marginal 
  spines 
  (fig. 
  8, 
  cj 
  simple, 
  pointed 
  and 
  rather 
  widely 
  separated. 
  Anal 
  cleft 
  

   short, 
  or 
  two 
  to 
  three 
  times 
  longer 
  than 
  the 
  lobes. 
  Anal 
  ring 
  of 
  10 
  hairs. 
  Anal 
  

   lobes 
  (fig. 
  8, 
  d) 
  with 
  the 
  proximal 
  margin 
  much 
  longer 
  than 
  the 
  distal 
  margin 
  ; 
  

   apex 
  with 
  several 
  hairs. 
  Dorsum, 
  in 
  heavily 
  stained 
  preparations, 
  with 
  widely 
  

   separated, 
  broadly 
  oval 
  or 
  subcircular 
  cells. 
  Venter 
  with 
  innumerable 
  circular 
  

   gland-pores, 
  the 
  tubular 
  connections 
  of 
  which 
  (fig. 
  8, 
  /), 
  are 
  suddenly 
  truncate 
  on 
  

   one 
  side 
  near 
  the 
  proximal 
  end 
  and 
  furnished 
  with 
  a 
  rosette-like 
  extension. 
  

   Length, 
  3-3*75 
  mm 
  ; 
  width, 
  1*75-3 
  mm. 
  

  

  British 
  Guiana 
  : 
  Turkeyn, 
  East 
  Coast, 
  on 
  Avicennianitida, 
  22.vi.1917 
  (G. 
  E. 
  Bodkin). 
  

  

  The 
  integumental 
  characters 
  of 
  this 
  insect 
  are 
  unusual, 
  and 
  should 
  serve, 
  together 
  

   with 
  the 
  form 
  of 
  the 
  antennae, 
  the 
  anal 
  lobes 
  and 
  stigmatic 
  spines, 
  to 
  distinguish 
  it 
  

   from 
  its 
  allies. 
  

  

  