﻿INVESTIGATIONS 
  INTO 
  THE 
  BIONOMICS 
  OF 
  GLOSSINA 
  PALPALIS. 
  

  

  461 
  

  

  As 
  will 
  be 
  seen 
  by 
  reierence 
  to 
  the 
  graph 
  (fig. 
  11), 
  the 
  increase 
  of 
  fly 
  in 
  the 
  region 
  

   south 
  of 
  Bale 
  and 
  just 
  north 
  of 
  Namirembe 
  has 
  been 
  phenomenal. 
  Below 
  Sekwe, 
  

   however, 
  the 
  reverse 
  has 
  taken 
  place, 
  as 
  shown 
  by 
  comparison 
  between 
  conditions 
  

   in 
  1915, 
  and 
  as 
  they 
  were 
  described 
  by 
  Dr. 
  Van 
  Someren 
  in 
  1906 
  in 
  his 
  report 
  for 
  

   that 
  region. 
  

  

  Conditions 
  in 
  1906. 
  

   (Report 
  of 
  Dr. 
  R. 
  Van 
  Someren.) 
  

  

  " 
  The 
  only 
  fly 
  met 
  with 
  (in 
  the 
  region 
  

   south 
  of 
  Sekwe) 
  occurs 
  along 
  the 
  shore 
  

   from 
  a 
  point 
  near 
  the 
  village 
  of 
  Dumo 
  

   northward 
  for 
  about 
  one 
  and 
  one 
  -half 
  

   miles 
  to 
  the 
  Kirala 
  River, 
  and 
  gradually 
  

   tailing 
  off 
  from 
  this 
  river 
  toward 
  Sekwe. 
  

  

  From 
  Dumo 
  toward 
  the 
  river 
  the 
  fly 
  

   is 
  very 
  abundant. 
  

  

  " 
  The 
  range 
  inland 
  (between 
  Dumo 
  and 
  

   the 
  Kirala 
  river) 
  is 
  practically 
  nil, 
  as 
  the 
  

   extent 
  of 
  dry 
  land 
  at 
  the 
  lake 
  -side 
  is 
  not 
  

   more 
  than 
  five 
  yards 
  in 
  width 
  at 
  the 
  

   broadest 
  part. 
  Inside 
  this 
  dyke 
  is 
  exten- 
  

   sive 
  dense 
  forest 
  of 
  kibo 
  palm 
  (BapMa) 
  

   down 
  to 
  the 
  lake-side, 
  standing 
  in 
  very 
  

   swampy 
  ground. 
  

  

  " 
  Opposite 
  Dumo, 
  where 
  the 
  ground 
  

   rises 
  fairly 
  sharply 
  the 
  fly 
  crosses 
  a 
  belt 
  

   of 
  scrub 
  and 
  long 
  grass 
  intervening 
  between 
  

   lake 
  and 
  village 
  and 
  is 
  found 
  in 
  the 
  planta- 
  

   tions 
  immediately 
  bordering 
  the 
  belt. 
  I 
  

   frequently 
  saw 
  them 
  on 
  women 
  digging 
  

   in 
  this 
  part. 
  

  

  Conditions 
  in 
  1915. 
  

  

  (Fly 
  Survey.) 
  

  

  The 
  fly 
  still 
  occurs 
  from 
  the 
  same 
  point 
  

   near 
  the 
  old 
  site 
  of 
  the 
  village 
  of 
  Dumo 
  

   northward, 
  but 
  its 
  density 
  is 
  notably 
  

   changed 
  at 
  several 
  points. 
  

  

  The 
  fly 
  is 
  hardly 
  what 
  would 
  be 
  called 
  

   " 
  very 
  abundant 
  " 
  at 
  any 
  point, 
  but 
  it 
  

   is 
  not 
  at 
  all 
  abundant 
  from 
  Dumo 
  toward 
  

   the 
  river. 
  On 
  the 
  contrary, 
  it 
  falls 
  off 
  

   to 
  a 
  low 
  minimum 
  before 
  the 
  river 
  is 
  

   reached, 
  and 
  then 
  begins 
  to 
  rise 
  slowly, 
  

   owing 
  to 
  migration 
  from 
  the 
  colonies 
  at 
  

   Sekwe 
  and 
  Mujuzi 
  Creek. 
  The 
  infestation 
  

   at 
  the 
  Kirala 
  River 
  now 
  consists 
  mainly 
  

   of 
  flies 
  coming 
  in 
  from 
  Sekwe, 
  instead 
  of 
  

   being 
  at 
  the 
  edge 
  of 
  a 
  centre 
  of 
  infestation 
  

   with 
  fly 
  tailing 
  off 
  toward 
  Sekwe. 
  

  

  The 
  extensive 
  dense 
  forest 
  still 
  exists, 
  

   and 
  is 
  still 
  exceedingly 
  swampy, 
  the 
  water 
  

   at 
  the 
  back 
  of 
  the 
  dyke 
  standing 
  at 
  a 
  higher 
  

   level 
  than 
  the 
  lake. 
  But 
  instead 
  of 
  

   coming 
  down 
  to 
  the 
  lake 
  -side 
  there 
  is 
  a 
  

   belt 
  of 
  exceedingly 
  soft 
  marsh, 
  with 
  grass 
  

   and 
  a 
  little 
  papyrus 
  lying 
  outside 
  the 
  old 
  

   beach, 
  from 
  which 
  the 
  open 
  lake 
  is 
  all 
  but 
  

   completely 
  hidden. 
  The 
  dyke, 
  or 
  beach 
  

   of 
  1906, 
  is 
  now 
  a 
  terrible 
  tangle 
  of 
  shrubbery 
  

   weighted 
  down 
  with 
  rank 
  vines, 
  and 
  with 
  

   marsh 
  grasses 
  growing 
  rankly 
  along 
  its 
  

   outer 
  edge. 
  Outside 
  the 
  marshy 
  belt, 
  

   10 
  to 
  30 
  yards 
  from 
  the 
  old 
  beach 
  line 
  of 
  

   1906, 
  a 
  new 
  beach 
  was 
  forming 
  in 
  1915. 
  

   Range 
  inland 
  at 
  this 
  point 
  is 
  noted 
  on 
  

   page 
  408. 
  Flies 
  were 
  found 
  on 
  a 
  situtunga 
  

   shot 
  400 
  yards 
  from 
  the 
  lake 
  shore. 
  

  

  At 
  the 
  very 
  end 
  of 
  the 
  fly 
  beach 
  described 
  

   by 
  D 
  r. 
  Van 
  Someren, 
  where 
  the 
  ground 
  begins 
  

   to 
  rise 
  fairly 
  sharply, 
  is 
  found 
  the 
  remains 
  

   of 
  the 
  large 
  colony 
  he 
  describes 
  as 
  existing 
  

   in 
  1906. 
  A 
  few 
  hundred 
  yards 
  south 
  the 
  

   belt 
  of 
  scrub 
  and 
  tall 
  grass 
  — 
  elephant 
  grass- 
  

   still 
  separates 
  the 
  lake 
  from 
  what 
  were 
  the 
  

   old 
  plantations. 
  There 
  is 
  now 
  exceedingly 
  

   dense 
  jungle 
  with 
  occasional 
  openings 
  kept 
  

   clear 
  by 
  the 
  hippo 
  and 
  permeated 
  with 
  

   a 
  net 
  work 
  of 
  hippo 
  trails. 
  The 
  fly 
  still 
  

   penetrates 
  the 
  belt 
  of 
  tall 
  grass, 
  following 
  

   the 
  hippo 
  trails, 
  which 
  have 
  replaced 
  the 
  

   foot-paths 
  leading 
  to 
  watering 
  places, 
  and 
  

   it 
  is 
  now 
  found 
  inland, 
  in 
  the 
  very 
  centre 
  

   of 
  the 
  old 
  village 
  site 
  (see 
  p. 
  408 
  note 
  on 
  

   inland 
  range 
  at 
  Dumo). 
  

  

  