﻿.364: 
  

  

  W. 
  F. 
  FISKE. 
  

  

  the 
  experiment. 
  This 
  was 
  done 
  ; 
  camp 
  was 
  pitched 
  squarely 
  in 
  the 
  fly 
  belt 
  on 
  Kome 
  ; 
  

   three 
  days 
  were 
  spent 
  in 
  exploration 
  and 
  survey 
  of 
  bush 
  and 
  old 
  plantations 
  along 
  

   its 
  shore 
  ; 
  four 
  hunting 
  trips 
  were 
  made 
  to 
  Damba, 
  and 
  afterwards 
  two 
  days 
  were 
  

   spent 
  in 
  a 
  camp 
  located 
  squarely 
  in 
  the 
  fly 
  belt 
  on 
  that 
  island. 
  

  

  The 
  results 
  of 
  the 
  experiment 
  are 
  summarised 
  in 
  Table 
  XI. 
  Host 
  animals 
  were 
  

   more 
  than 
  five 
  times 
  as 
  numerous 
  on 
  Damba 
  as 
  on 
  Kome, 
  with 
  the 
  result 
  that 
  female 
  

   percentage 
  was 
  very 
  much 
  lower. 
  Density 
  was 
  not 
  less 
  than 
  six 
  times 
  greater 
  on 
  

   Damba, 
  but 
  owing 
  to 
  the 
  relative 
  scarcity 
  of 
  wild 
  hosts, 
  fly 
  was 
  much 
  more 
  prone 
  

   to 
  bite 
  on 
  Kome, 
  when 
  one-sixth 
  the 
  number 
  of 
  flies 
  inflicted 
  nine 
  times 
  as 
  many 
  

   bites. 
  This 
  would 
  indicate 
  the 
  fly 
  to 
  be 
  nine 
  times 
  more 
  likely 
  to 
  transmit 
  disease 
  

   on 
  Kome 
  than 
  on 
  Damba, 
  although 
  the 
  density 
  is 
  only 
  one- 
  sixth 
  as 
  great. 
  

  

  Table 
  XI. 
  

  

  Comparison 
  of 
  the 
  Behaviour 
  of 
  Glossina 
  palp 
  a] 
  is 
  towards 
  Man 
  on 
  Kome 
  and 
  

  

  Damba 
  Islands. 
  

  

  Basis 
  of 
  Comparison. 
  

  

  Kome. 
  

  

  Damba. 
  

  

  Number 
  of 
  hours 
  spent 
  in 
  bush 
  along 
  shore 
  at 
  times 
  when 
  fly 
  was 
  

  

  

  

  active 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  

  

  14 
  

  

  22 
  

  

  Number 
  of 
  hours 
  spent 
  in 
  camp 
  in 
  fly 
  belt, 
  at 
  times 
  when 
  fly 
  was 
  

  

  

  

  active 
  

  

  10 
  

  

  8 
  

  

  Average 
  density 
  of 
  fly 
  in 
  bush, 
  about 
  . 
  

  

  5-0 
  

  

  30-0* 
  

  

  Average 
  density 
  of 
  fly 
  at 
  camp, 
  about 
  

  

  5-0 
  

  

  150 
  

  

  Female 
  i)ercentage 
  in 
  bush 
  

  

  38-1 
  

  

  10-2 
  

  

  Wild 
  hosts 
  of 
  fly 
  seen 
  or 
  flushed 
  : 
  — 
  

  

  

  

  Varanus 
  . 
  . 
  

  

  

  

  12 
  

  

  Situtunga 
  . 
  

  

  7 
  

  

  50 
  

  

  Total 
  

  

  7 
  

  

  62 
  

  

  "Wild 
  hosts 
  seen 
  or 
  flushed 
  per 
  hour 
  

  

  0-5 
  

  

  2-8 
  

  

  Number 
  of 
  times 
  observer 
  was 
  bitten 
  in 
  bush. 
  

  

  3 
  

  

  

  

  ,, 
  „ 
  „ 
  camp 
  

  

  4 
  

  

  1 
  

  

  Total 
  

  

  7 
  

  

  1 
  

  

  Number 
  of 
  times 
  bitten 
  per 
  hour 
  in 
  bush 
  

  

  0-21 
  

  

  00 
  

  

  ,, 
  „ 
  camp 
  

  

  0-40 
  

  

  012 
  

  

  Number 
  of 
  times 
  bitten 
  per 
  hour 
  spent 
  on 
  island 
  

  

  0-28 
  

  

  0-03 
  

  

  * 
  The 
  catches 
  made 
  during 
  this 
  trip 
  indicate 
  a 
  somewhat 
  heavier 
  infestation 
  than 
  this, 
  

   but 
  it 
  is 
  known 
  that 
  they 
  were 
  too 
  high; 
  they 
  were 
  made 
  at 
  points 
  where 
  flies 
  were 
  

   concentrated, 
  and 
  allowance 
  is 
  made 
  for 
  lower 
  average 
  density. 
  

  

  The 
  really 
  striking 
  comparison, 
  however, 
  is 
  between 
  the 
  figures 
  as 
  given 
  for 
  Damba, 
  

   and 
  the 
  note 
  made 
  during 
  field 
  work 
  on 
  the 
  beach 
  at 
  Bale 
  (see 
  p. 
  362) 
  to 
  the 
  effect 
  

   that 
  " 
  nearly 
  every 
  fly 
  tried 
  to 
  bite," 
  and 
  that 
  15 
  actually 
  bit 
  in 
  less 
  than 
  one 
  hour. 
  

  

  Density, 
  as 
  indicated 
  by 
  the 
  male 
  catch 
  at 
  Damba, 
  is 
  three 
  or 
  six 
  times 
  greater 
  

   than 
  at 
  Bale, 
  but 
  at 
  Damba 
  22 
  hours 
  were 
  spent 
  in 
  the 
  bush 
  without 
  being 
  bitten 
  

   once, 
  as 
  compared 
  with 
  15 
  bites 
  in 
  one 
  hour 
  at 
  Bale, 
  a 
  proportion 
  of 
  less 
  than 
  1 
  to 
  

   more 
  than 
  15 
  X 
  22 
  = 
  330. 
  

  

  