﻿OBSERVATIONS 
  ON 
  THE 
  OVIPOSITION 
  OF 
  THE 
  HOUSE-FLY 
  IN 
  PANAMA. 
  

  

  305 
  

  

  The 
  Monthly 
  Meteorological 
  Report 
  of 
  the 
  Panama 
  Canal 
  gives 
  the 
  temperature 
  

   and 
  humidity 
  at 
  Balboa 
  Heights, 
  near 
  Ancon, 
  for 
  the 
  three 
  months 
  during 
  which 
  these 
  

   observations 
  were 
  being 
  carried 
  out 
  as 
  follows 
  : 
  — 
  

  

  1918. 
  

  

  Average 
  

  

  Maximum 
  

  

  Temperature 
  

  

  (deg. 
  Fahr.) 
  

  

  Average 
  

  

  Minimum 
  

  

  Temperature 
  

  

  (deg. 
  Fahr.) 
  

  

  Average 
  

  

  Mean 
  

  

  Temperature 
  

  

  (deg. 
  Fahr.) 
  

  

  Mean 
  

  

  Relative 
  

  

  Humidity 
  

  

  (per 
  cent.) 
  

  

  January 
  

  

  February 
  

  

  March 
  

  

  86-0 
  

   87-9 
  

   88-3 
  

  

  70-8 
  

   71-4 
  

   70-4 
  

  

  78-5 
  

   79-7 
  

   79-4 
  

  

  81-4 
  

   76-0 
  

   79-0 
  

  

  These 
  observations 
  on 
  the 
  house-fly 
  in 
  Panama 
  may 
  be 
  briefly 
  summarised 
  as 
  

   follows 
  : 
  — 
  

  

  Copulation 
  may 
  occur 
  within 
  24 
  hours 
  after 
  emergence. 
  

  

  One 
  successful 
  copulation 
  seems 
  to 
  be 
  sufficient 
  to 
  fertilise 
  the 
  female 
  for 
  her 
  

   life-period. 
  , 
  

  

  Oviposition 
  may 
  take 
  place 
  as 
  early 
  as 
  two 
  and 
  a 
  quarter 
  days 
  after 
  emergence. 
  

  

  As 
  many 
  as 
  159 
  eggs 
  may 
  be 
  deposited 
  in 
  one 
  batch. 
  

  

  Large 
  batches 
  are 
  sometimes 
  deposited 
  at 
  intervals 
  of 
  but 
  36 
  hours. 
  

  

  One 
  female 
  may 
  deposit 
  as 
  many 
  as 
  21 
  batches, 
  or 
  a 
  total 
  of 
  2,387 
  eggs, 
  in 
  31 
  days 
  

   after 
  emergence. 
  

  

  (8053) 
  

  

  x'2 
  

  

  