1916 



ENTOMOLOGICAL SOCIETY 



13:5 



Hence it is probable that Table 1 closely approxiniatus the actual field 

 conditions. 



Adui-t Fly Moktai.itv. 



Having satisfied ourselves that many flies emerge from the soil in September, 

 several important considerations open up, viz., length of life of the fly, mortality, 

 whether copulation occurs in autunui and eggs are laid, whether these eggs are 

 fertile, and if so what happens to the young maggots, and lastly what proportion, 

 if any, of the adults winter as adults. 



The question of tlie length of life of the fly and the mortality is represented 

 by the following table 2. The flies as they emerged, as indicated in table 1, were 

 placed in 6-inch tubes and kept under observation in. a shaded box under outside 

 temperature conditions. Periodically they were examined for mortality and the 

 live ones fed a little syrup and water solution. This table 2, therefore, has direct 

 reference to the "sex" column on fly emergence as indicated in table 1. To in- 

 terpret this table read horizontally for fly emergence and perpendicularly for date 



of death. 



TABLE II. — Male Mortality. 



