325 
Reference  has  already  been  made  to  the  observation  that 
Gl.  morsitans,  even  in  its  natural  haunts,  will  quickly  retreat  from  a 
pel  son  coming  to  a  halt,  although  they  may  have  been  pestilent 
immediately  prior  to  this.  Our  notes  would  indicate  that  they  may 
recede  from  game  in  the  same  way,  for  upon  the  four  occasions  on 
which  we  came  up  to  resting  rhinoceri  we  could  not  detect  any 
increase  in  the  number  of  flies  surrounding  them— indeed,  twice  they 
appeared  absent  though  we  had  captured  them  at  the’  same  spot 
on  the  previous  day.  The  following  case  is  of  interest  in  this 
connection  :  — 
One  of  us  approached  a  herd  of  hartebeest  against  the  wind,  being  badly 
annoyed  by  morsitans  m  so  doing,  and  lay  down  on  an  ant-hill  within  thirty  yards 
of  the  nearest  animals.  Four  were  lying  down  and  four  standing  up,  all  apparently 
asleep,  and  judging  from  the  ‘spoor’  they  had  been  there  some  time  We 
remained  on  the  ant-hill  from  12.35  to  i.io  watching  them  carefully  through  prism 
glasses  without  being  able  to  ascertain  the  occurrence  of  tsetse.  Whether  from 
habit  or  not  we  cannot  say,  but  it  is  rare  to  see  any  of  the  tailed  antelope  keep 
that  organ  still  for  more  than  a  few  minutes,  and  in  the  present  case  the  standino- 
animals  made  periodic  switches.  For  the  last  fifteen  minutes  of  our  watch  we 
never  saw  or  felt  any  tsetse  on  ourselves,  though  at  least  six  were  present  when 
the  ant-lnll  was  reached,  and  we  did  not  feel  any  biles.  Two  of  these  animals 
were  then  shot,  but  no  fly  were  seen,  though  the  rest  of  the  herd  did  not  at  first 
move  off  more  than  100  yards.  On  walking  away  we  commenced  to  collect  tsetse 
again  within  200  yards. 
Sir  Alfred  Sharpe  and  Mr.  Harger  have  referred  to  districts 
in  Nyasaland  where  game  is  plentiful  and  morsitans  absent,  and 
conversely,  where  morsitans  abound  and  game  excessively  scanty. 
In  North-Eastern  Rhodesia  the  same  disassociation  is  met  with  on 
localised  areas.  Speaking  broadly,  however,  the  best  game  country 
is  m  the  Mpika,  Chinsah  and  Kasama  divisions,  which  for  the  most 
part  are  alternating  bush  and  dambo  affording  ideal  haunts  for  all 
varieties ;  and  the  concurrent  existence  of  tsetse  appears  to  us  to  be 
due  to  a  preference  for  the  same  bush  country.  Certain  of  the 
Officials,  all  keen  hunting  men  and  observers,  have  substantiated 
this  observation,  and  in  reports  have  quoted  instances  in  their 
particular  districts  which  go  to  disprove  any  intimate  connection. 
It  is  well  known  that  Mr.  Selous  has  asserted  that  a  peculiar 
affinity  exists  between  the  buffalo  south  of  the  Zambesi  and  the 
tsetse  which  occur  there.  In  Northern  Rhodesia  there  do  not 
appear  to  be  any  grounds  for  this  view,  and  men  well  versed  in  the 
country  have  denied  it.  Our  own  observations  were  made  on  the 
west  side  of  Lake  Bangueolo  where  tsetse  are  known  to  be  found 
