65 
finding  a  few  small  Planorbis  and  also  mos¬ 
quito  larvae  and  nymphae.  We  were  not 
troubled  by  blood-sucking  flies  or  gnats. 
23  VIII.  The  morning  was  spent  at  the 
laboratory;  in  the  afternoon  we  visited  the 
old  water  reservoir  of  Beberibe.  We  caught 
adult  mosquitos  of  the  genera  Taeniorhyn- 
chus,  Mansonia  and  Haemagogus.  There  were 
some  larvae  of  Culex  and  Anopheles  but  no 
signs  of  Planorbis. 
24  VIII.  In  the  sugar-factory  of  S.  João 
near  Varzea  we  examined  two  ponds,  one 
of  them  in  communication  with  the  river 
Capiparibe,  but  though  they  looked  very 
promising,  they  contained  no  Planorbis.  We 
caught  some  frogs  and  enormous  tadpoles, 
the  gut  of  which  was  quite  free  from  parasi¬ 
tes,  not  containing  even  Opalinae.  We  also 
collected  larvae  of  Aedeoniyia  squamipennis 
and  of  Anophelmae. 
25  VIII.  We  made  all  the  preparations 
for  a  journey  to  Natal. 
26  VIII.  We  left  by  train  for  Natal  and 
travelled  all  day  through  country  which 
became  gradually  more  dry,  after  we 
left  the  coast.  In  many  places  we  saw  cot¬ 
ton  plantations.  We  passed  the  night  in  Gua- 
bira  or  Independencia,  where  there  are  two 
ponds.  In  one  of  them  we  found  some  very 
large  frogs,  knov/n  in  the  North  by  the  name 
of  gia,  some  Bufo  marinus  and  specimens 
of  a  large  Ampullaria\  none  of  them  con¬ 
tained  interesting  parasites.  The  inns,  where 
travellers  have  to  pass  the  night,  are  very 
primitive  and  abound  in  Stegomyia,  making 
the  place  rather  dangerous. 
27  VIII,  In  the  morning  we  saw 
the  damage  done  by  the  “lagarta  rosea” 
(larva  of  Gelechia  gossypiella)  to  the  cotton 
of  this  region.  During  the  whole  expedition 
we  never  saw  plantations  quite  free  from  it.  — 
We  continued  our  journey  and  arrived  at 
Natal,  in  time  to  visit  the  governor,  who 
introduced  us  to  the  authorities  of  the 
place. 
28  VIII.  We  visited  the  hospital  where 
we  found  a  patient  with  Schtânsomum,  arri¬ 
ved  from  Boa  Cica. 
29  VIII.  We  made  an  excursion  to  the 
lake  of  Estremoz,  but  failed  to  obtain  a 
canoe.  Still,  we  gathered  two  species  of  Pla¬ 
norbis.  The  first,  of  which  we  obtained  nume¬ 
rous  live  specimens,  was  guadaloupensis.  Of 
the  second,  centimetralis ,  we  only  obtained  a 
few  small  specimens  alive,  but  a  large 
number  of  empty  and  quite  bleached  shells. 
30  VIII.  In  the  morning  we  visited  the 
water  supply  and  a  pool  near  it,  without 
finding  any  Planorbis;  in  the  afternoon  we 
went  to  the  strand  of  Areia  Preta  and  re¬ 
turned  over  very  high  dunes  without  finding 
anything  of  great  interest. 
31  VIII.  Excursion  to  Ceará-Mirim.  We 
took  an  early  train  to  Estremoz,  from 
where  we  went  on  a  trolly,  driven  on  the 
rails  by  men  with  poles.  During  the  traject 
we  examined  a  large  number  of  poo's  and 
some  more  after  arriving,  but  only  in  one  of 
them  did  we  find  PI.  centimetralis ,  in  fair 
number. 
1  IX.  We  returned  by  train  and  found 
that  one  of  the  servants  had  collected  some 
PI.  centimetralis  and  many  mgrilabris  inside 
the  limits  of  the  city. 
2  IX.  Failing  to  find  enough  material 
for  study,  we  decided  to  proceed  to  Pa- 
rahyba.  The  train  stopped  in  Independencia 
for  the  night,  giving  us  the  chance  of  exami¬ 
ning  the  other  pond.  Here  we  found  many 
centimetralis ,  which  were  wanting  in  the  ponds 
first  examined.  It  is  not  at  all  uncommon  to 
find  such  differences  in  fresh  water  collections, 
situated  close  to  one  another. 
3  IX.  During  the  journey  we  saw  a  good 
deal  of  cotton  attacked  by  Gelechia  gos¬ 
sypiella.  We  arrived  early  in  Parahyba.  After 
visiting  the  governor  who  received  us  very 
kindly,  we  went  with  the  director  of  the  sa¬ 
nitary  service  to  the  general  Hospital.  We 
noticed  the  comparative  frequency  of  stones 
in  the  bladder  and  saw  a  good  deal  of  anky¬ 
lostomiasis,  malaria  and  many  ulcers  of 
the  leg.  We  visited  the  Lagoa  de  Baixo, 
which  is  rather  shallow  and  covered  with 
Pistia  stratiotes,  on  which  we  found  many 
Planorbis  cimex  and  another  small  species 
of  the  same  sub-genus  Spirulina.  There 
