﻿INVESTIGATIONS 
  INTO 
  THE 
  BIONOMICS 
  OP 
  GLOSSINA 
  PALPALIS. 
  

  

  371 
  

  

  Records 
  made 
  in 
  the 
  course 
  of 
  the 
  fly 
  survey 
  of 
  Bugaba 
  Island 
  as 
  presented 
  in 
  

   ng. 
  3 
  afford 
  a 
  second 
  excellent 
  example 
  of 
  the 
  correlation 
  between 
  character 
  of 
  

   sheltering 
  vegetation, 
  density 
  of 
  male 
  flies 
  and 
  percentage 
  of 
  females 
  in 
  the 
  catch. 
  

   In 
  this 
  particular 
  case 
  there 
  was 
  a 
  short 
  reach 
  of 
  sandy 
  shore 
  at 
  observation 
  point 
  

   43 
  which 
  served 
  as 
  a 
  breeding 
  ground 
  for 
  the 
  flies, 
  but 
  which 
  was 
  poorly 
  (too 
  

   slightly) 
  sheltered. 
  At 
  either 
  end 
  of 
  this 
  bit 
  of 
  sandy 
  shore 
  was 
  forest, 
  with 
  marshy, 
  

   reed-grown 
  fore-shore 
  of 
  a 
  distinctly 
  unattractive 
  type. 
  Only 
  where 
  the 
  forest 
  

   growth 
  came 
  down 
  to 
  the 
  more 
  open 
  sandy 
  shore 
  at 
  points 
  42 
  and 
  44 
  was 
  shelter 
  

   really 
  attractive 
  

  

  Observation 
  

   Points 
  

  

  40 
  

  

  41 
  42 
  

  

  43 
  44 
  45 
  

  

  46 
  

  

  Density 
  

  

  4- 
  

  

  7 
  

  

  5 
  

  

  3 
  12 
  ■• 
  

  

  7 
  

  

  7- 
  

  

  6 
  14 
  

  

  ■0 
  4 
  

  

  ■0 
  

  

  2 
  

  

  5 
  

  

  Female 
  

   Percentage 
  

  

  30 
  

  

  

  

  26- 
  

  

  10- 
  

  

  

  

  18- 
  

  

  3- 
  

  

  5 
  25 
  

  

  

  

  25- 
  

  

  

  

  Female 
  

   Percentage 
  

  

  

  

  •** 
  

  

  \ 
  

   \ 
  

   \ 
  

  

  \ 
  

  

  \ 
  

   \ 
  

  

  \ 
  

   \ 
  

   \ 
  

  

  / 
  

   / 
  

  

  / 
  

  

  v 
  / 
  

  

  / 
  

   / 
  

  

  \ 
  

  

  \ 
  

   \ 
  y 
  

  

  / 
  

   / 
  

   i 
  

   1 
  

   I 
  

   / 
  

   / 
  

   / 
  

  

  \ 
  / 
  

  

  

  

  

  

  

  

  

  

  / 
  ' 
  

  

  

  

  /A 
  

  

  \ 
  

   \ 
  

  

  / 
  \ 
  

  

  / 
  \ 
  

   t 
  \ 
  

  

  

  

  

  Density 
  

  

  

  

  

  

  L 
  me 
  : 
  

  

  At 
  

  

  \ 
  

  

  out 
  3,000 
  y 
  

  

  / 
  \ 
  

  

  f 
  

  

  

  

  

  

  

  

  

  ' 
  

  

  Shelter 
  

  

  Poor 
  

  

  Poor 
  Good 
  

  

  Poor 
  Good 
  Poor 
  

  

  Poor* 
  

  

  ; 
  Breeding 
  

   Ground 
  

  

  None 
  

  

  None 
  None 
  

  

  Poor 
  None 
  None 
  

  

  None 
  

  

  ., 
  -..- 
  

  

  Fig. 
  3. 
  Correlation 
  between 
  character 
  of 
  shelter, 
  density 
  of 
  male 
  flies 
  and 
  

  

  percentage 
  of 
  females. 
  

  

  Figure 
  3 
  shows 
  an 
  excerpt 
  from 
  the 
  data 
  secured 
  during 
  the 
  " 
  fly 
  survey 
  " 
  of 
  the 
  

   island 
  of 
  Bugaba 
  (vide 
  Sect. 
  VI. 
  (g) 
  ) 
  and 
  illustrates 
  conditions 
  of 
  infestation 
  by 
  fly 
  

   along 
  a 
  reach 
  of 
  shore 
  about 
  If 
  miles 
  in 
  length. 
  In 
  all, 
  more 
  than 
  150 
  miles 
  of 
  mainland 
  

   and 
  island 
  shore 
  were 
  systematically 
  surveyed 
  in 
  this 
  manner, 
  and 
  the 
  data 
  secured 
  

   have 
  served 
  in 
  scores 
  of 
  cases 
  to 
  confirm 
  the 
  conclusions 
  herein 
  stated 
  concerning 
  

   the 
  correlation 
  between 
  character 
  of 
  shelter, 
  density 
  of 
  males 
  and 
  female 
  percentage. 
  

  

  A 
  single 
  other 
  example 
  may 
  be 
  given 
  in 
  Sect. 
  Ill 
  (d) 
  which 
  follows. 
  

  

  Ill 
  id). 
  Notes 
  on 
  Survey 
  of 
  Lutoboka 
  Bay, 
  Bugalla 
  (Sesse) 
  Island. 
  

  

  Figure 
  4 
  presents 
  the 
  results 
  of 
  a 
  survey 
  of 
  some 
  5 
  miles 
  of 
  shore, 
  principally 
  

   included 
  in 
  the 
  large 
  circular 
  bay 
  that 
  lies 
  within 
  the 
  peninsula 
  of 
  Lutoboka 
  on 
  

   Bugalla 
  (Sesse) 
  Island. 
  This 
  survey 
  was 
  undertaken 
  with 
  the 
  object 
  of 
  collecting 
  

   data 
  relative 
  to 
  the 
  effect 
  of 
  environment 
  upon 
  range 
  and 
  density 
  of 
  Glossina 
  palpalis. 
  

  

  