Jireedmg-places  of  this  new  Anopheline  were  found  in  the  Gainrah 
and  Chubra  quarters  of  Cairo ;  also  at  Demadache,  and  at  I  leluan, 
abount  fifteen  miles  from  Cairo.  The  waters  in  which  the 
Pyrelophorus  larvae  live  is  brackish,  the  dissolved  sodium  chloride 
varying  from  0'366  per  cent,  to  2'6  per  cent.,  and  as  a  imle  few  or  no 
grasses  or  water-plants  have  been  present. 
In  the  same  jxiols  the  larx  ae  of  a  new  Culicid  (n.sp.  and  ?  nov.  gen.) 
have  also  always  been  found,  but  neither  of  the.se  species  has- -except 
on  one  doubtful  occasion — ever  been  found  associated  with  Cellia 
pharoensis,  nor  have  they  yet  been  found  on  the  west  bank  of  the 
river. 
Larvae,  of  C.  pharoensis,  both  young  and  well-grown,  placed  in 
water  containing  r/S  per  cent,  common  salt,  taken  from  a  breeding- 
place  of  the  Pyretophorus  larvae,  died  in  less  than  twenty-four  hours. 
In  water  containing  i  per  cent,  common  salt,  also  from  a  Pyretophorus 
breeding-place,  Cellia  larvae  lived  from  two  to  three  days,  but  during 
this  period  until  death  took  place  they  were  very  sluggish  m  their 
movements  and  appeared  to  feed  veiy  little  or  not  at  all,  though  m 
each  case  food  was  provided  for  them. 
rhe  more  distant  environs  of  Cairo  visited  were  Marg  and  Ezbet 
el  Nakhl  to  the  North,  and  Toura  and  Heluan  to  the  South.  In  both 
the  former  places  Cellia  pharoensis  was  common,  also  Ciilex,  spp.  and 
Grabhamia  tvillcocksii. 
At  Toura,  Cellia  pharoensis  breeds  in  borrow-pits  situated  in  the 
desert,  some  close  to  the  railway,  others  further  away.  Except  in  one 
case  neither  grass  nor  reeds  grew  in  these  pits,  but  the  surface  of  the 
water  was  overgrown  with  algae,  which  provided  protection  as  well  as 
food  for  the  larvae.  It  is  of  interest  to  note  that  a  few  years  ago,  there 
was  an  outbreak  of  malaria  amongst  the  con\ucts  at  Toura  prison. 
The  prison  buildings  are, within  a  short  distance  of  the  borrow-pits 
mentioned. 
At  Heluan,  m  pools  in  marshy  ground  lying  immediately  to  the 
South-west  of  the  town  the  larvae  of  the  new  Pyretophorus  were 
found  in  large  numbers.  The  water  in  these  pools  contained  from 
2'56  per  cent,  to  3'25  per  cent,  of  common  salt.  In  a  pool  to  the  North 
of  the  town  the  Pyretophorus  larvae  were  found  associated  with  the 
larvae  of  Grabhamia  uillcocksii,  Theobald,  and  Theobaldinella 
spathipal pis,  Rondani.  The  water  in  this  pool  contained  i’6  per 
