July, 1914.] THE APPLE MAGGOT. 47 



cheese-cloth, and the front glass. In each cage was placed a lot 

 of flies that had emerged on a given date. Moisture was pro- 

 vided in each cage. One apple was supplied in each cage and 

 as a rule, was changed daily. The apple was cut in half so as ta 

 present freshly exposed surface on which flies might feed. The 

 fruit used was known not to be infested. It was secured from 

 North Carolina and from California. As they were removed, 

 the sections of apple were placed on soil to observe development 

 of larvae from any eggs that might have been laid in them. 



The flies in these cages lived longer than those in the tree 

 cages of the previous year. The record for each lot is given in 

 detail in Table 6. 



Some eggs were laid by the flies in these cages. The sections 

 of apple removed were placed on soil. This soil was kept intact, 

 but was not examined for pupae or empt}'^ pupal cases until 

 April, 1914. The results of the examination were as follows: 



In Lot 1, an egg was laid in a section of apple that was in the 

 cage for one day, twenty-six days after the flies emerged and were 

 placed in the cage. The larva developed to the pupal stage. 



In Lot 3, consisting of 8 females and 6 males emerged and 

 placed in the cage July 17, an egg was laid in a section of apple 

 that was in the cage July 21, the larva developing to the pupal 

 stage. Thus there is established in this instance a possible 

 minimum period after emergence before egg-laying of not to 

 exceed four days. Also 2 eggs were laid in a section that was 

 in the cage August 4, the larva developing to pupation. 



. In Lot 4, an egg was laid in an apple that was in the cage for 

 one day, nineteen days after the flies emerged and were placed in 

 the cage. The larva developed to the pupal stage. 



In Lot 5, an egg was laid in an apple that was in the cage for 

 one day, sixteen days after the flies emerged and were placed in 

 the cage. The larva pupated. 



All flies used in the 1913 experiments were from 1911 pupae, 

 representing the two-year phase in the life cycle of the species, 

 as discussed later in this bulletin. 



Comparison with Results of Dissection of Flies. Illingworth 

 (34, p. 143), in daily dissection of flies found that twenty 

 to twenty-four days were required after emergence before ripe 

 eggs were found in the egg-tube. The flies used were those that 



