The Currant Fruit Fly. 



209 



SUMMARY OF DURATION OF STAGES IN LIFE 

 HISTORY. 



The duration of the different stages in the hfe history, the 

 mating, preoviposition, egg-laying periods and the longevity of 

 the adults as determined under laboratory and field conditions 

 are summarized in table 16. 



TABLE 16. 



Summary of Duration of Stages in Life History Under 

 Laboratory and Field Conditions. 



stages in life history 



1914 

 (days) 



1915 

 (days) 



Egg period _ _ 



* 4 — 7 fi — 8 



Larval period _ _ _ - . 



*10 — 18 



11—25 



Pupal period (months) 



10—11 



33 



* 7—16 



34 



?29 



10—11 



Mating period - _ _ 



38 



Preoviposition period 



6 

 36 



Longevity of adults 



29—31 







Laboratory conditions. 



HABITS AND BEHAVIOR OF ADULTS. 



Feeding Habits. 



The only observation on the feeding habits of Epochra 

 canadensis made in 1914, was that of a single female fly which 

 was seen feeding on a currant flower on May 25. During the 

 following season, the adults were frequently noticed lapping up 

 honey-dew from plant lice infesting currant leaves. 



Starvation Experiments. 



A series of experiments were performed to determine the 

 number of days that currant fruit flies would live in captivity 

 on water and without water. Shortly after emerging from pupae, 

 one lot of trypetids was confined in a glass jar with the top 

 enclosed by cheese cloth. On the same day another lot of speci- 

 mens collected in shady localities in the field was placed in cap- 

 tivity in a similar glass container. Four times daily either dis- 

 tilled or lake water was sprayed through the cheese cloth into 



