30 MAINE AGRICULTURAL EXPERIMENT STATION. 



EXPLANATION OF PLATE— THE CURRANT FLY. 



Epochra Canadensis, Loew. 



All except Figure i were drawn by the writer. 



Figure i. The female fly enlarged about seven and a half 

 times. Drawn by Mr. J. H. Emerton from slides of the wing 

 and ovipositor prepared by the writer arid from pinned flies. 

 The two basal joints of the abdomen are drawn as one. The 

 real number, including the long terminal segment is seven 

 instead of six. 



Figure 2. Egg showing form, sculpture and pedicel, enlarged 

 fifty times. 



Figure 3. The larva enlarged about five times. 



Figure 4. The pupa enlarged eight times. 



Figure 5. The caudal spiracle of the larva much enlarged. 



Figure 6. First two segments of the head showing the 

 tubercles on the head, the rugose mouth and the rasping organs. 

 Enlarged twenty-five times. 



Figure 7. Seed of currant with gelatinous envelope show- 

 ing larva protuding from it. Enlarged. 



Figure 8. External genitalia of male. Enlarged twenty 

 times. 



Figure 9. Side view of abdomen of female with ovipositor 

 protruding and bent backward in the position it takes as the egg 

 is deposited under the skin to one side of the puncture. 

 Enlarged. 



Figure 10. Abdomen of male with genitalia and showing 

 six segments. Enlarged. 



REMEDIES. 



We have had no experience with this insect as it is new to 

 Maine as an injurious species. From a study of its life history 

 we discover only one vulnerable point. The insect spends 

 nearly eleven months of the year in the ground. In the winged 

 stage it cannot be destroyed so far as we know. The eggs 

 are deposited under the skin of the fruit and spraying would do 

 no good. Part of the infested fruits drop prematurely and the 

 worms remain in them for some time before they emerge and 

 go into the ground. Based upon this last habit we would 



