The Currant Fruit Fly. . -207 



berry garden, and the last specimens issued on June 11, 1914, 

 and June 18, 1915. During twc seasons, the last trypetids were 

 captured on July 10, in this commercial garden, and if these 

 insects emerged on June 11 and 18, the longevity of the adults 

 would have been 29 days in 1914, and 22 days in 1915. In anoth- 

 er currant and gooseberry patch at a distance of about a mile 

 from the commercial garden a male currant fruit fly was cap- 

 tured as late as August 12, 1915. The last date of emergence 

 was June 18, making the longevity of this imago apparently 55 

 days. Under laboratory conditions, however, a few specimens 

 of Epochra were kept alive in jars for a period of 9 weeks. 



An experiment was performed to determine the longevity 

 of marked male and female currant fruit flies under natural con- 

 ditions. Trypetids were removed from cages in the field, marked 

 with different colored waterproof inks, and were set free in a 

 currant and gooseberry garden on the same day that they issued. 

 One hundred thirteen male and 74 female flies were released in 

 two differently marked lots. No attempt was made to capture 

 any flies during the first two weeks. During the third week 15 

 males and 14 females were caught in shady localities in the cur- 

 rant and gooseberry garden and during the fourth week three 

 males and two females were taken. The last male was captured 



29 days after liberation, and two females were collected after 



30 and 31 days of freedom. 



One Brood Only. 



According to Paine (1912, p. 142) "the only evidence that 

 suggests a second brood, is the report of a single specimen of 

 Epochra canadensis collected at Redwood City late in summer." 

 A male currant fruit fly was captured by the writer as late as 

 August 12, 1915, at Orono. This specimen was caught in the 

 shade on a limb of an apple tree which was growing among cur- 

 rant and gooseberry bushes. 



During the season of 1914, 121 quarts of infested goose- 

 berries were taken into an insectary of the enclosed type to deter- 

 mme whether a second brood of flies would emerge. This build- 

 ing was provided wnth a glass roof sprayed with whitewash, a 

 number of windows in the two sidewalls and two screen doors, 

 one in each endwall. The fruit was allowed to remain within 

 the insect-house until the larvae completed their development. 



