﻿435 
  

  

  of 
  these 
  insects, 
  a 
  list 
  of 
  species, 
  both 
  economic 
  and 
  non-econoniic, 
  

   is 
  given 
  with 
  their 
  host-plants. 
  The 
  following 
  species 
  are 
  described 
  

   with 
  details 
  regarding 
  their 
  colour, 
  eggs, 
  filaments, 
  etc. 
  

  

  Pseudococcus 
  affinis, 
  Mask., 
  (tuber 
  mealy 
  bug). 
  Recorded 
  in 
  

   Cahfornia 
  as 
  attacking 
  Anemone 
  sp. 
  It 
  occurs 
  in 
  Australia 
  and 
  was 
  

   most 
  probably 
  imported 
  on 
  its 
  host-plants, 
  \iz., 
  the 
  tubers 
  of 
  dahUas 
  

   and 
  potatoes. 
  

  

  P. 
  agrifoliae, 
  Essig, 
  (coast 
  Uve 
  oak 
  mealy 
  bug). 
  So 
  far 
  this 
  species 
  

   has 
  only 
  been 
  found 
  feeding 
  on 
  the 
  tender 
  bark 
  on 
  the 
  edges 
  of 
  

   wounds 
  under 
  the 
  rough 
  outer 
  bark 
  of 
  the 
  coast 
  live 
  oak 
  (Quercus 
  

   agrifolia). 
  

  

  P. 
  andersoni, 
  Coleman, 
  on 
  Cupressus 
  goveniana 
  and 
  incense 
  cedar, 
  

   Libocedrus 
  decurrens. 
  

  

  P. 
  artemisiae, 
  Essig, 
  (Artemisia 
  mealy 
  bug). 
  Feeds 
  on 
  the 
  bark 
  

   above 
  or 
  just 
  below 
  the 
  ground 
  of 
  the 
  Cahfornia 
  sage 
  (Artemisia 
  

   calif 
  ornica) 
  and 
  upon 
  the 
  roots 
  of 
  Senecio 
  sp. 
  

  

  P. 
  aurilanatus, 
  Mask., 
  (golden 
  or 
  Araucaria 
  mealy 
  bug). 
  Found 
  

   on 
  the 
  smaller 
  stems 
  of 
  the 
  monkey 
  puzzle 
  {Araucaria 
  bidivillii) 
  the 
  

   Norfolk 
  Island 
  pine 
  (Araucaria 
  excelsa), 
  Dammar 
  a 
  ovata 
  and 
  D. 
  vitiensis. 
  

  

  P. 
  azcdeae, 
  Tins., 
  (azalea 
  mealy 
  bug). 
  Taken 
  upon 
  Azalea 
  sp. 
  in 
  a 
  

   single 
  Japanese 
  nursery 
  at 
  San 
  Jose, 
  Cal., 
  and 
  probably 
  imported 
  

   from 
  Japan. 
  

  

  P. 
  bakeri, 
  Essig, 
  (Baker's 
  mealy 
  bug) 
  recently 
  called 
  w^alnut 
  mealy 
  

   bug. 
  Food-plants 
  are 
  varied 
  and 
  gradually 
  increasing 
  in 
  number. 
  

   They 
  include 
  the 
  following 
  : 
  lemon 
  (Citrus 
  medica 
  limon), 
  orange 
  

   (Citrus 
  aurantium), 
  pear 
  (Pyrus 
  communis), 
  potato 
  (Solanum 
  tubero- 
  

   sum), 
  Japanese 
  quince 
  (Cydonia 
  japonica), 
  w^alnut 
  (Juglans 
  regia), 
  and 
  

   willow^ 
  (Salix 
  sp.), 
  and 
  other 
  plants 
  of 
  less 
  economic 
  importance. 
  This 
  

   species 
  is 
  a 
  native 
  one 
  and 
  is 
  doubtless 
  checked 
  by 
  natural 
  enemies, 
  

   but 
  its 
  presence 
  should 
  be 
  carefully 
  watched 
  and 
  control 
  measures 
  

   adopted 
  on 
  its 
  becoming 
  an 
  economic 
  factor. 
  

  

  P. 
  citri, 
  Risso, 
  (citrus 
  mealy 
  bug), 
  on 
  the 
  following 
  : 
  — 
  Citron 
  

   (Citrus 
  medica 
  genuiana), 
  coffee 
  (Coffea 
  arabica), 
  cotton 
  (Gossypium 
  

   sp.), 
  grape 
  (Vitis 
  vinifera), 
  Guadaloupe 
  Island 
  palm 
  (Erythea- 
  edulis), 
  

   lemon, 
  orange, 
  pomelo 
  (Citrus 
  decumana), 
  pumpkin 
  (Cucurbita 
  pepo), 
  

   redw^ood 
  (Sequoia 
  sempervirens), 
  tobacco 
  (Nicotiana 
  tabacum), 
  besides 
  

   a 
  great 
  variety 
  of 
  other 
  cultivated 
  plants. 
  It 
  probably 
  has 
  a 
  mder 
  

   distribution 
  in 
  the 
  State 
  than 
  any 
  other 
  species 
  — 
  the 
  distribution 
  in 
  

   Southern 
  Cahfornia 
  is 
  shown 
  on 
  a 
  map 
  — 
  and 
  is 
  of 
  great 
  economic 
  

   importance, 
  though 
  since 
  1910, 
  w^hen 
  much 
  work 
  w-as 
  done 
  upon 
  it, 
  

   there 
  has 
  been 
  a 
  general 
  decline 
  in 
  its 
  attacks. 
  

  

  P. 
  crawii, 
  Coq., 
  (white 
  sage 
  mealy 
  bug). 
  The 
  food-plants 
  are 
  the 
  

   CaUfornian 
  sage 
  (Artemisia 
  californica) 
  and 
  white 
  sage 
  (Ratnona 
  

   polystachya). 
  

  

  P. 
  cupressi, 
  Colm. 
  Occurs 
  only 
  on 
  the 
  Monterey 
  cypress 
  (Cupressus 
  

   macrocarpa) 
  ; 
  the 
  young 
  feed 
  principally 
  about 
  the 
  bases 
  of 
  the 
  cones. 
  

  

  P. 
  dudleyi, 
  Colm., 
  (Dudley's 
  mealy 
  bug). 
  Taken 
  only 
  on 
  Cupressus 
  

   macnabiana. 
  

  

  P. 
  ephedrae, 
  Coq., 
  (Ephedra 
  mealy 
  bug) 
  found 
  on 
  Ephed^ra 
  cali- 
  

   fornica. 
  

  

  P. 
  hymenocleae, 
  Ckll. 
  The 
  food-plant 
  is 
  Calif 
  ornian 
  sage 
  (Artemisia 
  

   californica) 
  ; 
  the 
  author 
  thinks 
  this 
  may 
  prove 
  to 
  be 
  synonymous 
  with 
  

   P. 
  artemisiae, 
  Essig. 
  

  

  