﻿SOME 
  INJURIOUS 
  NEOTROPICAL 
  WEEVILS. 
  

  

  67 
  

  

  The 
  larvae 
  of 
  this 
  insect 
  are 
  stated 
  by 
  Mr. 
  Bondar 
  to 
  bore 
  in 
  the 
  leaf-stems 
  of 
  

   the 
  papaw 
  (Carica 
  papaya). 
  

  

  This 
  species 
  belongs 
  to 
  Dr. 
  Heller's 
  subgenus 
  Psciidopiazurus 
  (1906) 
  and 
  is 
  very 
  

   closely 
  allied 
  to 
  P. 
  obesus, 
  Boh., 
  which, 
  however, 
  has 
  the 
  granules 
  on 
  the 
  elytra 
  

   rather 
  widely 
  spaced 
  and 
  nearly 
  round, 
  and 
  the 
  scales 
  are 
  appreciably 
  longer 
  ; 
  the 
  

   thoracic 
  prominence 
  is 
  a 
  little 
  lower 
  ; 
  and 
  in 
  the 
  male 
  genitalia 
  the 
  struts 
  of 
  the 
  

   median 
  lobe 
  are 
  broadly 
  spatulate 
  at 
  the 
  apex, 
  whereas 
  in 
  P. 
  papayanus 
  they 
  are 
  

   almost 
  linear. 
  

  

  In 
  the 
  present 
  species 
  the 
  median 
  lobe 
  of 
  the 
  male 
  aedoeagus 
  (fig. 
  3) 
  is 
  not 
  in 
  

   the 
  form 
  of 
  a 
  chitinous 
  tube, 
  but 
  is 
  entirely 
  membranous 
  above, 
  the 
  ventral 
  portion 
  

   forming 
  a 
  broad 
  subquadrate 
  shovel-shaped 
  chitinous 
  trough, 
  the 
  apex 
  of 
  which 
  

   is 
  broadly 
  truncate 
  and 
  bears 
  on 
  its 
  lower 
  surface 
  a 
  large 
  patch 
  of 
  long 
  hairs 
  on 
  each 
  

   side 
  ; 
  the 
  median 
  struts 
  are 
  formed 
  as 
  a 
  continuous 
  extension 
  of 
  the 
  thickened 
  edges 
  

  

  Fig. 
  3. 
  Piazums 
  papayanus, 
  sp. 
  n., 
  male 
  genitalia 
  : 
  a, 
  tegmen 
  ; 
  

  

  b, 
  spiculum. 
  

  

  of 
  the 
  median 
  lobe, 
  and 
  are 
  rather 
  more 
  than 
  half 
  as 
  long 
  again 
  as 
  the 
  lobe 
  itself, 
  

   being 
  only 
  slightly 
  widened 
  dorsoventrally 
  at 
  the 
  apex. 
  The 
  uneverted 
  sac 
  is 
  very 
  

   broad 
  and 
  extends 
  for 
  nearly 
  half 
  its 
  length 
  beyond 
  the 
  ends 
  of 
  the 
  median 
  struts 
  ; 
  

   the 
  portion 
  adjoining 
  the 
  median 
  lobe 
  contains 
  a 
  large 
  chitinous 
  plate 
  (0-5 
  mm.' 
  

   long) 
  shaped 
  like 
  a 
  bird's 
  wing, 
  broadest 
  (0-2 
  mm.) 
  near 
  its 
  internal 
  end 
  and 
  

   (6160) 
  e2 
  

  

  