THE CURRANT FLY. 25 



the roasted Redonda as with the other phosphates. This result 

 confirms the work here reported. It will be seen by reference 

 to the diagram here given that the corn and barley (plants 

 closely related to rye) gave better results with the Redonda 

 phosphate than with the finely ground Florida rock. 



SUMMARY. 



1. Plants differ in their ability to feed upon crude phos- 

 phates. 



2. Turnips and ruta-bagas gave nearly as good returns with 

 the Florida rock as with the dissolved rock. 



3. In nearly every other case the best results were obtained 

 by the use of the dissolved rock. 



4. Barley and corn appear to require an acid phosphate. 



5. Except with the barley, corn, turnip roots and potato 

 tubers, the crude Florida rock yielded better returns than the 

 phosphate of iron and alumina. 



6. When early maturity is desired, the acid phosphate can 

 profitably be used. 



7. The solubility of a phosphate in ammonium citrate is not 

 always the correct measure of its actual value to the plant. 



Bulletin No. 35. 



THE CURRANT FLY. GOOSEBERRY FRUIT FLY. 



Epochra Canadensis, Loew/ 



(Order Diptera; Family Trypetidae.) 



By F. L. Harvey. 



HISTORY AND DISTRIBUTION. 



This species was first considered by Loew in 1873, from a 

 single faded female contributed by Osten Sacken. Osten 

 Sacken's material may have come from Maine, as he gives 

 Norway, Maine, as the locality, the specimens having been 

 collected by S. J. Smith. Loew gives Canada as a locality 

 upon the authority of Mr. Provancher. How long the species 

 had been known before it was described does not appear, but 





