﻿INVESTIGATIONS 
  INTO 
  THE 
  BIONOMICS 
  OP 
  GLOSSINA 
  PALPALIS. 
  

  

  373 
  

  

  III 
  (e). 
  Maximum 
  Percentage 
  of 
  Females 
  brought 
  about 
  by 
  Segregation 
  

   through 
  Movements. 
  

  

  The 
  maximum 
  percentage 
  of 
  females 
  amongst 
  active 
  flies 
  encountered 
  at 
  any 
  

   point 
  on 
  island 
  or 
  mainland 
  was 
  in 
  the 
  district 
  of 
  Buddu 
  between 
  the 
  old 
  landing 
  

   places 
  known 
  as 
  Kalkosa 
  (or 
  Sekwe) 
  and 
  Bale. 
  The 
  figures 
  of 
  the 
  catches 
  made 
  

   during 
  a 
  fly 
  survey 
  of 
  this 
  coast 
  are 
  presented 
  in 
  Table 
  XVI. 
  The 
  distance 
  from 
  

  

  Table 
  XVI. 
  

  

  Catch 
  of 
  Fly 
  in 
  the 
  Mujuzi 
  Colony. 
  

  

  Date. 
  

  

  

  Observa- 
  

   tion 
  Point. 
  

  

  Catch 
  of 
  Fly. 
  

  

  Density 
  

  

  of 
  Males. 
  

  

  Percentage 
  

  

  (June 
  1915.) 
  

  

  Males. 
  

  

  Females. 
  

  

  Total. 
  

  

  of 
  Females. 
  

  

  24th 
  

   24th 
  

   22nd 
  

   22nd 
  

   22nd 
  

   24th 
  

   22nd 
  

   26th 
  

   26th 
  

   26th 
  

   26th 
  

  

  

  

  40 
  

   41 
  

   42 
  

   43 
  

   44 
  

   45 
  

   46 
  

   47 
  

   48 
  

   49 
  

   50 
  

  

  26 
  

   12 
  

   33 
  

   23 
  

   58 
  

   196 
  

   106 
  

   41 
  

   45 
  

   20 
  

   10 
  

  

  39 
  

  

  90 
  

  

  65 
  

  

  68 
  

  

  157 
  

  

  162 
  

  

  103 
  

  

  73 
  

  

  120 
  

  

  84 
  

  

  80 
  

  

  65 
  

   102 
  

  

  98 
  

  

  91 
  

   215 
  

   358 
  

   209 
  

   114 
  

   165 
  

   104 
  

  

  90 
  

  

  26-0 
  

   4-0 
  

   16-5 
  

   11-5 
  

   19*3 
  

   98-0 
  

   53*0 
  

   20-5 
  

   19-3 
  

   lO'O 
  

   5'0 
  

  

  60-0 
  % 
  

   88-3 
  % 
  

   66-0 
  % 
  

   76-2 
  % 
  

   73-0 
  % 
  

   45-3 
  % 
  

   49-2 
  % 
  

   64'0 
  % 
  

   72-7 
  % 
  

   80 
  8 
  % 
  

   88-8 
  % 
  

  

  Totals 
  and 
  averages 
  

   Average 
  by 
  points 
  

  

  570 
  

  

  104] 
  

  

  1611 
  

  

  26-0 
  

   26'6 
  

  

  67-6 
  % 
  

   69-5 
  % 
  

  

  point 
  40 
  to 
  point 
  50 
  is 
  about 
  3J 
  miles. 
  Point 
  45 
  is 
  at 
  the 
  mouth 
  of 
  Mujuzi 
  Creek, 
  

   which 
  affords 
  excellent 
  harbour 
  for 
  crocodiles, 
  as 
  well 
  as 
  breeding 
  places 
  for 
  the 
  

   fly 
  on 
  its 
  banks. 
  It 
  is 
  the 
  colony 
  centre, 
  and 
  centre 
  of 
  infestation 
  for 
  a 
  considerable 
  

   reach 
  of 
  shore. 
  Points 
  47 
  to 
  50 
  are 
  in 
  the 
  Bale 
  fly 
  beach 
  mentioned 
  in 
  Sect. 
  II 
  (a), 
  

   Table 
  VIII. 
  

  

  The 
  average 
  female 
  percentage 
  for 
  this 
  district 
  is 
  either 
  64 
  '6 
  or 
  69 
  '5 
  according 
  

   to 
  the 
  method 
  of 
  computation, 
  and 
  compared 
  with 
  the 
  maximum 
  encountered 
  on 
  

   the 
  islands 
  (57*5 
  or 
  64*6 
  for 
  the 
  colony 
  on 
  Kimmi 
  Island; 
  vide 
  pp. 
  363 
  and 
  370) 
  

   is 
  about 
  6 
  '0 
  points 
  higher. 
  This 
  is 
  undoubtedly 
  due 
  to 
  scarcity 
  of 
  food, 
  which 
  only 
  

   occurred 
  sufficiently 
  or 
  at 
  all 
  at 
  the 
  very 
  mouth 
  of 
  Mujuzi 
  Creek 
  (point 
  45). 
  The 
  

   behaviour 
  of 
  flies 
  bore 
  this 
  out 
  completely. 
  Nowhere 
  else 
  on 
  island 
  or 
  mainland 
  

   were 
  they 
  so 
  troublesome 
  ; 
  it 
  was 
  impossible 
  to 
  avoid 
  being 
  bitten, 
  even 
  with 
  both 
  

   hands 
  employed 
  wielding 
  fly 
  switches. 
  

  

  The 
  extraordinarily 
  high 
  proportion 
  of 
  females 
  at 
  points 
  41, 
  49 
  and 
  50 
  break 
  all 
  

   records 
  made 
  elsewhere 
  (for 
  equally 
  large 
  catches), 
  and 
  are 
  certainly 
  explained 
  by 
  

  

  