THE MONTHLY BULLETIN. 



155 



the third and fourth are parallel towards their end, both very gently curved back- 

 wards ; the section of the fourth vein preceding the discal cell is gently, but rather 

 distinctly arcuated backward, so that the shape of the discal cell somewhat reminds 

 of that of the species of Rivcllia; the cross-veins are comparatively rather long, 

 moderately approximated, their distance being about equal to the length of the 

 Tjosterior cross-vein ; the latter is rather steep, however, perceptibly approximated 

 to the apex with its anterior end. more than with the posterior ; the posterior corner 

 of the anal cell is very much drawn out in a point. 



Fig. 55. — The male of the yellow currant and goose- 

 berry fruit fly, Epochra canadensis. Enlarged. (Orig- 

 inal.) 



DISTRIBUTION. 



In California this insect is apparently confined to the central and 

 northern parts of the State. It is also distributed throughout the 

 northern and eastern states and Canada. 



CONTROL. 



[The following is adapted from Bulletin 325, Cornell University Agricultural 

 Experiment Station, "Cherry Fruit Flies and How to Control Them."] 



* * * The block of Montmorency trees that was chosen for the 

 experiment was so badly infested the previous year that the fruit was 

 not picked at all. 



The spray was not applied until the flies appeared, since, according 

 to observations on apple flies, it was thought that the eggs would be 

 about two weeks or more in developing after the flies emerged. The 

 cherries were more than half grown and some of them were turning 

 red when the first flies appeared. June 8. * * * 



The orchard was four rows wide and sixteen long. The plan decided 

 on was to divide it, spraying eleven of the short rows and leaving the 

 last five rows for a check. Since so little of the sweetened arsenate is 



