﻿Order 
  PARASITICA. 
  

  

  Under 
  this 
  head 
  come 
  the 
  sucking 
  lice, 
  which 
  are 
  parasitic 
  on 
  warm- 
  

   blooded 
  animals 
  other 
  than 
  birds. 
  They 
  never 
  become 
  winged, 
  have 
  prac- 
  

   tically 
  no 
  transformations, 
  the 
  body 
  is 
  more 
  or 
  less 
  flattened 
  and 
  either 
  

   the 
  feet 
  are 
  scansorial. 
  fitted 
  for 
  climbing 
  and 
  holding, 
  or 
  

   the 
  mouth 
  hooks 
  are 
  so 
  formed 
  as 
  to 
  enable 
  the 
  insect 
  to 
  

   anchor 
  itself 
  firmly 
  in 
  place. 
  The 
  insects 
  remain 
  on 
  their 
  

   host 
  constantly 
  and 
  the 
  eggs 
  are 
  nearly 
  always 
  attached 
  

   to 
  the 
  hair 
  of 
  the 
  host 
  animal. 
  

  

  Three 
  species 
  attack 
  man 
  and 
  sometimes 
  cause 
  serious 
  

   annoyance. 
  In 
  extreme 
  cases 
  an 
  infiammatory 
  condition 
  

   of 
  the 
  skin 
  may 
  be 
  set 
  up 
  to 
  which 
  the 
  terms 
  "phthiriasis" 
  

   and 
  "pediculosis" 
  have 
  been 
  applied. 
  

   Almost 
  all 
  the 
  domestic 
  and 
  many 
  of 
  the 
  wild 
  animals 
  are 
  

   Fig. 
  29.— 
  Head- 
  subject 
  to 
  infestation 
  and 
  the 
  list 
  here 
  given 
  will 
  undoubt- 
  

   louse, 
  Pcdiculus 
  ^^^^_^ 
  prove 
  incomplete 
  when 
  systematic 
  collections 
  are 
  

  

  capitis; 
  greatly 
  

   enlarged. 
  tnade. 
  

  

  Family 
  PEDICULID^. 
  

  

  PHTHIRIUS 
  Leach. 
  

  

  inguinalis 
  Leach. 
  The 
  "crab-louse": 
  

   found 
  in 
  the 
  arm-pits 
  and 
  pubic 
  re- 
  

   gions 
  of 
  man 
  and 
  sometimes 
  on 
  the 
  

   coarse 
  hair 
  of 
  the 
  breast. 
  The 
  grasp- 
  

   ing 
  structures 
  of 
  the 
  feet 
  are 
  so 
  well 
  

   developed 
  that 
  it 
  is 
  easier 
  to 
  pull 
  out 
  

   a 
  hair 
  than 
  to 
  remove 
  the 
  parasite 
  

   from 
  it. 
  Liberal 
  and 
  repeated 
  appli- 
  

   cations 
  of 
  mercurial 
  ointment 
  are 
  re- 
  

   quired 
  to 
  destroy 
  these 
  species. 
  

  

  Fig. 
  30. 
  — 
  Crab-louse, 
  Phthirius 
  

   inguinalis; 
  greatly 
  enlarged. 
  

  

  PEDICULUS 
  Linn. 
  

  

  capitis 
  DeG. 
  The 
  common 
  "head-louse;" 
  more 
  generally 
  found 
  on 
  

   children. 
  A 
  fine-tooth 
  comb 
  and 
  repeated 
  application 
  of 
  pomade 
  or 
  

   vaseline 
  will 
  readily 
  control 
  this 
  pest. 
  Tincture, 
  or 
  extract 
  of 
  Lark- 
  

   spur, 
  has 
  also 
  been 
  used 
  with 
  good 
  effect. 
  

  

  vestimenti 
  Leach. 
  "Body-louse," 
  "clothes-louse" 
  or 
  "gray-back." 
  Lays 
  

   its 
  eggs 
  in 
  the 
  seams 
  of 
  clothing 
  in 
  which 
  also 
  it 
  hides 
  when 
  not 
  

   actively 
  feeding. 
  Cleanliness 
  is 
  the 
  best 
  preventive; 
  when 
  an 
  attack 
  

   is 
  to 
  be 
  dealt 
  with, 
  use 
  mercurial 
  ointment 
  in 
  the 
  seams 
  of 
  the 
  cloth- 
  

   ing 
  or 
  dip 
  them 
  in 
  gasoline 
  two 
  or 
  three 
  times 
  at 
  intervals 
  of 
  one 
  

   week. 
  Steaming 
  or 
  thorough 
  boiling 
  will 
  answer 
  the 
  same 
  purpose. 
  

  

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