269 
In  all  cases  the  parasites  were  much  more  abundant  in  the 
posterior  part  of  the  midgut.  They  were  never  observed  outside  the 
intestinal  tract,  and  never  in  the  proctodaeum. 
S/a  ined  pefarat  io  ns. 
The  long  forms  measure  from  26 n  to  35//  in  length  and  from 
r8/«  to  2(1  in  width.  Both  ends  are  more  or  less  acute,  but  the 
anterior  is  the  more  attenuated  of  the  two.  The  nucleus  is  about  4/U  to 
4-5//  in  length,  is  oval,  and  usually  occupies  the  whole  width  of  the 
body.  The  blepharoplast  is  relatively  small,  and  in  contradistinction 
to  the  forms  seen  in  Glossina  falfalis,  is  usually  posterior  to  the 
nucleus,  and  is  separated  by  an  appreciable  interval  from  it.  The 
undulating  membrane  is  very  poorly  developed,  and  the  flagellum  does 
not,  as  a  rule,  attain  to  any  great  length.  The  general  protoplasm 
stains  a  rather  deep  blue,  and  is  homogeneous  in  structure. 
The  clubbed  variety  measures  20yu  to  25 /z  in  length  by  about  3/j 
in  width.  The  posterior  extremity  is  rounded,  and  the  body  attains 
its  maximum  width  a  short  distance  anterior  to  this  point.  From  the 
point  of  greatest  width  it  tapers  gently  to  the  anterior  end.  The 
nucleus  is  rounded  or  oval,  and  is  situated  more  towards  the  posterior 
part  of  the  body.  The  blepharoplast,  in  these  forms,  frequently  is 
placed  anteriorly  to  the  nucleus,  and  is  usually  small.  The  flagellum 
and  undulating  membrane  are  not  well  marked,  and  the  free  part  of 
the  flagellum  is  quite  short.  The  body  protoplasm  stains  rather 
lightly. 
The  ‘  beaked  ’  forms  are  of  comparatively  frequent  occurrence,  but 
do  not  present  any  other  peculiarity  of  structure  than  the  special 
shape  of  the  posterior  part  of  the  body.  This  has  a  rounded  end,  and 
is  very  narrow  until  it  approaches  the  nuclear  area  when  the  body 
expands  into  an  oval  portion,  beyond  which  it  becomes  gradually 
drawn  out  towards  the  anterior  end. 
1  he  oval,  flagellated  forms  when  stained  are  seen  to  be  composed 
of  a  large  globular  mass,  from  one  end  of  which  the  body  is  prolonged 
as  a  narrow  process  containing  the  flagellum.  The  enlarged  portion 
measures  from  y  fi  to  15/u  in  length  by  4'5/u  to  6/z  in  width,  and  the 
prolonged  portion  from  64  to  12/z.  The  nucleus  is  usually  oval,  and 
stains  uniformly.  The  blepharoplast  is  rounded,  and  is  usually  in 
