﻿64 
  GUY 
  A. 
  K. 
  MARSHALL. 
  

  

  Grenada. 
  On 
  the 
  1st 
  May 
  1921, 
  I 
  visited 
  the 
  pineapples, 
  where 
  the 
  weevil 
  had 
  been 
  

   found, 
  with 
  Mr. 
  Williams 
  and 
  Mr. 
  Donovan, 
  and 
  together 
  we 
  got 
  additional 
  specimens 
  

   and 
  made 
  observations 
  which 
  seem 
  to 
  give 
  the 
  main 
  points 
  as 
  to 
  the 
  manner 
  of 
  

   attack 
  by 
  this 
  insect. 
  

  

  ' 
  The 
  pineapples 
  had 
  been 
  planted 
  some 
  years 
  ago, 
  but 
  for 
  about 
  three 
  years 
  

   had 
  had 
  no 
  attention. 
  The 
  plants 
  had 
  been 
  overgrown 
  with 
  weeds 
  and 
  bush, 
  which 
  

   had 
  been 
  cut, 
  over 
  a 
  part 
  of 
  the 
  holding, 
  a 
  short 
  time 
  before 
  our 
  visit. 
  Many 
  of 
  

   the 
  pines 
  grew 
  in 
  the 
  shade 
  of 
  trees 
  of 
  various 
  kinds. 
  Pineapples 
  belonging 
  to 
  other 
  

   peasants, 
  where 
  clean 
  cultivation 
  was 
  practised, 
  were 
  examined, 
  but 
  no 
  weevils 
  or 
  

   signs 
  of 
  their 
  attacks 
  were 
  seen. 
  It 
  would 
  seem 
  a 
  safe 
  statement 
  to 
  make 
  that 
  this 
  

   insect 
  is 
  not 
  likely 
  to 
  attack 
  pineapples 
  when 
  they 
  are 
  grown 
  under 
  conditions 
  of 
  

   clean 
  cultivation, 
  in 
  open 
  fields 
  away 
  from 
  the 
  influence 
  of 
  shade. 
  This 
  opinion, 
  

   however, 
  is 
  based 
  on 
  the 
  conditions 
  observed 
  on 
  only 
  one 
  visit 
  to 
  this 
  infested 
  patch. 
  

  

  " 
  The 
  injury 
  to 
  the 
  pine 
  (Plate 
  ii) 
  is 
  largely 
  the 
  result 
  of 
  the 
  feeding 
  of 
  the 
  larvae, 
  

   in 
  the 
  fruit 
  stalk, 
  in 
  the 
  centre 
  of 
  the 
  developing 
  fruit 
  and 
  in 
  the 
  crown. 
  The 
  feeding 
  

   punctures 
  of 
  the 
  adults 
  in 
  the 
  developing 
  fruit, 
  the 
  fruit-suckers 
  and 
  the 
  crown, 
  

   and 
  excavations 
  apparently 
  made 
  by 
  the 
  female 
  for 
  egg-laying 
  also 
  cause 
  consider- 
  

   able 
  injury. 
  The 
  adult 
  weevils, 
  in 
  captivity, 
  feed 
  on 
  the 
  fruit, 
  the 
  stalk, 
  the 
  crown, 
  

   and 
  the 
  leaves 
  of 
  the 
  base 
  of 
  the 
  suckers, 
  as 
  well 
  as 
  perforating 
  the 
  leaves 
  of 
  the 
  

   crown 
  and 
  suckers. 
  The 
  vegetative 
  portions 
  of 
  the 
  plants, 
  roots, 
  root-stock, 
  stem 
  

   and 
  leaves 
  are 
  not 
  attacked. 
  

  

  " 
  The 
  feeding 
  punctures 
  made 
  by 
  the 
  adults 
  are 
  small 
  and 
  circular, 
  and 
  those 
  in 
  

   the 
  stalk 
  and 
  fruit 
  may 
  be 
  as 
  deep 
  as 
  the 
  length 
  of 
  the 
  rostrum 
  to 
  the 
  eyes. 
  The 
  

   excavations 
  believed 
  to 
  be 
  made 
  for 
  the 
  reception 
  of 
  the 
  eggs 
  are 
  shallow 
  and 
  oval, 
  

   and 
  seem 
  to 
  be 
  dug 
  out 
  by 
  means 
  of 
  the 
  mandibles. 
  The 
  excavating 
  of 
  these 
  cavities 
  

   and 
  the 
  egg 
  -laying 
  have 
  not 
  been 
  observed. 
  

  

  " 
  From 
  observations 
  in 
  the 
  field 
  it 
  appears 
  that 
  the 
  eggs 
  are 
  laid 
  in 
  the 
  flower- 
  

   stalk, 
  and 
  the 
  larva 
  makes 
  its 
  way 
  either 
  up 
  or 
  down. 
  Stalks 
  were 
  found 
  in 
  which 
  

   the 
  work 
  of 
  the 
  larvae 
  was 
  to 
  be 
  seen 
  from 
  the 
  base 
  of 
  the 
  fruit 
  to 
  the 
  base 
  of 
  the 
  

   stalk, 
  but 
  no 
  cases 
  were 
  found 
  in 
  which 
  the 
  larva 
  had 
  penetrated 
  into 
  the 
  centre 
  

   of 
  the 
  plant 
  ; 
  though 
  several 
  instances 
  were 
  observed 
  in 
  which 
  the 
  larva 
  had 
  gone 
  

   up 
  into 
  the 
  fruit, 
  and 
  in 
  one 
  case 
  the 
  base 
  of 
  the 
  crown 
  was 
  eaten 
  out. 
  

  

  " 
  The 
  feeding 
  punctures 
  of 
  the 
  adults 
  often 
  completely 
  spoil 
  the 
  fruit. 
  A 
  badly 
  

   attacked 
  pine 
  will 
  show 
  gummy 
  exudations 
  and 
  will 
  be 
  deformed 
  and 
  undersized. 
  

   Attacked 
  pines 
  often 
  lose 
  their 
  crowns, 
  even 
  though 
  the 
  pine 
  itself 
  is 
  comparatively 
  

   uninjured. 
  The 
  greatest 
  damage 
  appears 
  to 
  result 
  from 
  attacks 
  on 
  the 
  fruit-stalk, 
  

   which 
  is 
  often 
  so 
  badly 
  eaten 
  that 
  it 
  breaks 
  down 
  with 
  the 
  weight 
  of 
  the 
  fruit. 
  

  

  " 
  The 
  control 
  of 
  this 
  pest 
  appears 
  to 
  lie 
  in 
  good 
  cultivation 
  and 
  the 
  absence 
  of 
  

   shade. 
  The 
  pineapples 
  should 
  be 
  planted 
  in 
  straight 
  and 
  regular 
  rows, 
  with 
  sufficient 
  

   distances 
  between 
  the 
  rows 
  to 
  allow 
  of 
  clean 
  weeding 
  ; 
  no 
  bush 
  should 
  be 
  allowed 
  to 
  

   grow 
  amongst 
  them. 
  

  

  " 
  If 
  pines 
  that 
  have 
  been 
  properly 
  planted 
  and 
  carefully 
  tended 
  should 
  be 
  

   attacked 
  by 
  the 
  weevil, 
  it 
  should 
  be 
  possible 
  to 
  check 
  such 
  an 
  attack 
  without 
  much 
  

   loss 
  by 
  collecting 
  the 
  weevils, 
  which 
  may 
  be 
  found 
  hiding 
  in 
  the 
  axils 
  of 
  the 
  leaves, 
  

   and 
  by 
  cutting 
  out 
  and 
  destroying 
  any 
  infested 
  fruit, 
  taking 
  care 
  to 
  cut 
  the 
  flower-stalk 
  

   at 
  the 
  very 
  base 
  in 
  order 
  to 
  make 
  sure 
  of 
  removing 
  any 
  larva 
  that 
  may 
  be 
  there." 
  

  

  Subfamily 
  Cryptorhynchinae. 
  

  

  Conotrachelus 
  psidii, 
  sp. 
  n. 
  (Plate 
  i, 
  fig. 
  1). 
  

  

  o 
  $. 
  Integument 
  dark 
  piceous 
  ; 
  the 
  pronotum 
  with 
  dense 
  fulvous 
  scaling, 
  and 
  

   usually 
  with 
  a 
  large 
  indefinite 
  darker 
  triangular 
  patch 
  in 
  the 
  middle 
  of 
  the 
  base, 
  

   caused 
  by 
  the 
  scaling 
  being 
  there 
  much 
  thinner, 
  so 
  that 
  the 
  integument 
  shows 
  through 
  ; 
  

   the 
  elytra 
  with 
  similar 
  dense 
  fulvous 
  scaling, 
  and 
  with 
  a 
  large 
  subquadrate, 
  ill-defined 
  

  

  