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Mukotwe  river).  Above  this  point,  the  change  in  the  character  of 
the  country  probably  accounts  for  its  absence.  The  fly  is  also  found 
for  shorter  distances  up  some  of  the  smaller  tributaries  of  the  lake 
and  the  Lovu. 
The  fly  was  first  found  on  Lake  Tanganyika  by  Spillane  in  November,  1907 
(beginning  of  the  rains).  We  found  it  on  the  Lovu  in  June,  1908  (dry  season),  and 
also  at  many  places  on  the  lake.  In  July  and  August,  1908,  the  fly  was  traced  up 
the  Lovu  river  by  Spillane  and  S.  A.  Neave.  We  utilised  canoes  in  this  work. 
During  the  months  of  March  and  April,  1908,  some  time  was  spent 
on  the  shores  of  Lake  Bangweulu  and  on  its  islands,  as  well  as  along 
some  of  its  confluents,  but  on  none  of  these  were  we  able  to  find 
Gl.  falpalis.  The  western  shore  of  the  lake  and  some  portions  of 
the  islands  have  definite,  wooded  banks,  but  the  northern  and  eastern 
sides  have  not.  On  these  sides,  all  the  tributaries  of  the  lake  flow 
through  large  swampy  plains  as  they  approach  it,  and  these,  in  turn, 
expand  into  immense  marshes  around  the  open  water.  The  Chambesi 
river  with  some  of  its  affluents  (April  and  May,  1908),  the  Luapula 
from  Lake  Bangweulu  to  Chongola’s  village  (September,  1907,  and 
March,  1908),  and  a  joortion  of  the  Luangwa  flowing  into  the 
Zambesi  (August,  1907),  were  examined  with  negative  results.  These 
have  also  been  searched  by  S.  A.  Neave  with  the  same  result. 
B.  In  Nyasaland. 
Gl.  pal  falls  has  not  yet  been  found  on  the  lake  or  any  of  its 
tributaries.  The  only  portions  we  have  examined  are  the  northern 
end  of  the  lake,  and  parts  of  the  Songwe,  Luflra,  and  North  Rukuru 
rivers,  in  December,  1908. 
2.  Glossina  morsiians. 
A.  In  North-Eastern  Rhodesia. 
In  this  country  Gl.  morsiians  has  an  extremely  wide  distribution. 
The  only  parts  which  can  be  said,  with  any  degree  of  certainty, 
to  be  free,  are  the  Tanganyika-Nyasa  plateau,  the  plateau  in  the 
neighbourhood  of  Serenje,  and  a  small  district  around  Fort  Jameson. 
B.  In  Nyasaland. 
The  fly  is  reported*  as  being  absent  in  the  mountainous  northern 
districts  of  the  country.  Its  chief  distribution  is  along  the  low 
•Survey  made  bj'  the  late  Capt.  F.  H.  Hardy,  K.A.M.C.,  and  Dr.  Wykesmith. 
