1.  INTRODUCTION 
In  our  previous  report,**  published  in  June,  1908,  we  reviewed 
shortly  the  conditions  we  had  found  in  North-Eastern  Rhodesia 
mentioned  the  distribution  of  tsetse  Hies  so  far  as  we  had  ascertained 
it  at  the  time,  and  made  several  suggestions  as  to  measures 
designed  to  limit  the  further  extension  of  human  trypanosomiasis, 
Unfortunately,  a  second  report  desiiatched  in  October,  1908,  went 
astray,  so  that  some  of  the  observations  embodied  in  the  present  paper 
are  rather  belated.  It  has  been  deemed  advisable,  however,  tu 
incor])orate  them  for  the  sake  of  comjrleteness. 
On  leaving  Madona,  on  the  Luapula  river,  in  February,  1908,  wc 
proceeded  to  Lake  Bangwculu  and  after  spending  some  days  on  its 
western  shores  and  on  its  islands,  sc])aratcd  ;  one  of  us  now  covcriiijr 
the  country  drained  hy  tlic  Chambesi  river,  while  the  other  followed 
the  Kalungwi.si  and  Euangwa  rivers  to  f.ake  Mweru,  thence  along 
the  northern  Anglo-(.longolese  boundary  and  the  British  section  of 
Lake  Tanganyika.  This  work  was  completed  at  Abercorn  in  juiip, 
1908.  I'hc  next  few  months  were  spent,  partially  on  an  island  at 
the  south  end  of  Lake  Tanganyika,  and  partially  at  a  camp 
established  about  thirty  miles  from  this  lake,  on  the  bluff  overlooking 
the  Lovu  river.  Wc  left  for  England  on  the  15th  of  November,  1908. 
One  of  us  proceeded  straight  from  Abercorn  to  railhead — Broken 
Hill, — the  other  travelled  across  the  Tanganyika-Nyasa  plateau  to 
Karonga,  and  then  by  way  of  Eake  Nyasa  and  the  rivers  Shire  and 
Zambesi  to  Chinde.  The  expedition  reached  England  on  the  27th 
of  March,  1909,  after  an  absence  of  twenty-three  months,  some  twenty 
of  which  were  actually  spent  in  the  country.  'I'hc  routes  followed, 
together  with  tlie  distribution  of  tsetse  flics  in  North-Eastern 
Rhodesia,  Nyasaland,  and  portions  of  North-Western  Rhodesia  and 
the  Congo  Free  .State,  will  be  found  on  the  attached  map.  .Some 
seven  thousand  miles,  exclusive  of  small  trips,  have  been 
covered,  and  observations  have  been  made  over  a  large  portion  of 
these  countries,  but  it  should  be  noted  that  practically  all  the  places 
were  visited  only  once,  so  that  no  very  great  degree  of  finality  exists 
in  the  work.  In  a  few  instances  wc  were  able  to  institute  comparisons 
at  different  seasons  of  the  year. 
*  KinRhoni  and  Montgomery,  iqoS.  Annals  Trop.  Medicine  and  I’arasitoloSi'i 
Vol.  II,  No.  2, 
