﻿INVESTIGATIONS 
  INTO 
  THE 
  BIONOMICS 
  OF 
  GLOSSINA 
  PALPALIS. 
  

  

  363 
  

  

  troublesome 
  than 
  this, 
  the 
  ordinary 
  person 
  makes 
  little 
  effort 
  to 
  ward 
  off 
  attack, 
  

   and 
  nearly 
  every 
  fly 
  that 
  cares 
  to 
  bite 
  does 
  so, 
  but 
  when 
  the 
  fly 
  is 
  as 
  troublesome 
  as 
  at 
  

   Bale, 
  where 
  " 
  nearly 
  every 
  fly 
  tried 
  to 
  bite 
  " 
  the 
  ordinary 
  person 
  is 
  continually 
  on 
  

   the 
  alert 
  to 
  ward 
  them 
  off, 
  and 
  not 
  nearly 
  so 
  many 
  flies 
  bite 
  as 
  would 
  otherwise 
  do 
  

   so. 
  The 
  difference 
  in 
  behaviour 
  of 
  fly 
  towards 
  man 
  on 
  such 
  islands 
  as 
  Tavu, 
  

   Bulago, 
  etc., 
  and 
  on 
  the 
  fly 
  beach 
  at 
  Bale 
  is 
  even 
  greater 
  than 
  the 
  figures 
  given 
  

   above 
  would 
  indicate. 
  

  

  Table 
  X. 
  

  

  Correlation 
  between 
  Female 
  Percentage 
  and 
  Behaviour 
  of 
  Glossina 
  palpalis 
  

  

  towards 
  Man. 
  

  

  Island. 
  Catch. 
  

  

  1 
  

  

  Density* 
  

  

  Females. 
  

  

  Behaviour 
  of 
  fly 
  towards 
  man. 
  

  

  Kimmi 
  

  

  Wema 
  

  

  Yempaita 
  . 
  

   Bulago 
  

  

  Nsadzi 
  

  

  Kizima 
  . 
  . 
  

   Tavu 
  

   Damba 
  . 
  . 
  

  

  1588 
  

   1413 
  

  

  1382 
  

   580 
  

  

  1080 
  

  

  513 
  

   674 
  

  

  975 
  

  

  24-3 
  

  

  30-5 
  

  

  42-6 
  

  

  27-5 
  

  

  18-4 
  

  

  15-1 
  

   46-6 
  

   30-7 
  

  

  57-5 
  % 
  

   39-1 
  % 
  

  

  37-9 
  % 
  

   29-0 
  % 
  

  

  24-6 
  % 
  

  

  18-9 
  % 
  

   17-1 
  % 
  

   12-2 
  % 
  

  

  More 
  troublesome 
  than 
  on 
  any 
  other 
  island. 
  

   At 
  times 
  or 
  in 
  places 
  as 
  bad 
  as 
  on 
  Kimmi 
  but 
  

  

  not 
  always 
  so 
  bad. 
  

   About 
  as 
  bad 
  as 
  Wema 
  would 
  average. 
  

   Not 
  as 
  bad 
  as 
  on 
  preceding 
  island, 
  but 
  bad 
  

  

  enough. 
  

   Not 
  as 
  bad 
  as 
  Bulago, 
  but 
  worse 
  than 
  on 
  

  

  Tavu 
  at 
  times. 
  

   Not 
  at 
  all 
  troublesome. 
  

   Not 
  as 
  bad 
  as 
  on 
  Bulago. 
  

   Less 
  troublesome 
  than 
  on 
  any 
  other 
  badly 
  

  

  infested 
  island. 
  

  

  * 
  Owing 
  to 
  the 
  varying 
  degree 
  of 
  activity 
  of 
  females 
  the 
  density 
  of 
  fiy 
  in 
  any 
  district 
  

   or 
  island 
  must 
  be 
  based, 
  for 
  comparative 
  purposes, 
  on 
  the 
  catch 
  of 
  males 
  alone. 
  

  

  II 
  (d). 
  Experiment 
  to 
  test 
  Variability 
  in 
  Behaviour 
  of 
  Fly 
  towards 
  Man 
  on 
  Kome 
  

   or 
  Damba 
  Islands, 
  as 
  correlated 
  with 
  Variations 
  in 
  Abundance 
  of 
  Host 
  Animals 
  

   and 
  Female 
  Percentage. 
  

  

  In 
  the 
  autumn 
  of 
  1915 
  a 
  definite 
  and 
  detailed 
  scheme 
  was 
  worked 
  out 
  for 
  the 
  

   reclamation 
  of 
  and 
  re-establishment 
  of 
  the 
  populations 
  upon 
  the 
  Sesse 
  Islands. 
  One 
  

   detail 
  of 
  this 
  scheme 
  was 
  the 
  placing 
  of 
  a 
  colony 
  [on 
  the 
  island 
  of 
  Kome 
  (Fig. 
  I), 
  

   which 
  in 
  itself 
  is 
  one 
  of 
  the 
  safest 
  in 
  the 
  lake 
  and 
  could 
  easily 
  be 
  made 
  much 
  safer 
  , 
  

   but 
  which 
  suffered 
  severely 
  from 
  sleeping 
  sickness 
  owing 
  "to 
  the 
  nearness 
  of 
  the 
  

   island 
  of 
  Damba, 
  which, 
  when 
  populated, 
  was 
  probably 
  the 
  most 
  insanitary 
  island 
  in 
  the 
  

   Sesse 
  group 
  ; 
  it 
  must 
  have 
  been 
  continuously 
  much 
  as 
  Lugazi 
  islet 
  was 
  after 
  being 
  

   occupied 
  for 
  three 
  days 
  by 
  hunters 
  of 
  the 
  wild 
  nosts 
  of 
  tsetse. 
  It 
  would 
  be 
  entirely 
  

   impractical 
  to 
  make 
  Damba 
  a 
  safe 
  place 
  for 
  a 
  native 
  population 
  to 
  live 
  unless 
  there 
  

   were 
  much 
  more 
  need 
  for 
  agricultural 
  land 
  than 
  at 
  present. 
  But 
  wild 
  hosts 
  were 
  

   so 
  numerous 
  and 
  female 
  ratio 
  so 
  low 
  that 
  theoretically 
  Damba, 
  if 
  unpopulated, 
  

   and 
  set 
  aside 
  as 
  a 
  bit 
  of 
  game 
  reserve, 
  would 
  not 
  be 
  a 
  source 
  of 
  danger 
  to 
  a 
  population 
  

   on 
  Kome. 
  

  

  It 
  was 
  desired 
  to 
  test 
  this 
  theory 
  by 
  pitching 
  camp 
  on 
  Kome, 
  and 
  spending 
  some 
  

  

  days 
  hunting 
  over 
  and 
  surveying 
  both 
  it 
  and 
  Damba, 
  keeping 
  accurate 
  count 
  of 
  the 
  

  

  number 
  of 
  times 
  that 
  flies 
  actually 
  bit 
  — 
  -without 
  engorging 
  — 
  during 
  the 
  days 
  spent 
  in 
  

  

  (659) 
  

  

  B 
  

  

  