134 



THE EEPOET OF THE 



Xo. 36 



Female Mortality. 



From these records it will be seen that the length of life varies from 7-25 days 

 in the autumn. This is of interest as the average life of an adult during the 

 summer is approximately only 4.5 days. 



It will be seen that all the flies in the above table 2, which emerged from 

 puparia up till September 20th, died. 



Those flies that emerged after September 20th (table 1 indicating that 

 emergence continued until September 27th), were treated in a different manner. 

 It was felt that 6-inch tubes hardly gave a fair test of longevity, hence a large 

 wire mesh cage was arranged to give the flies more liberty of flight. The records 

 follow on this experiment. 



