36 



BULLETIN OF THE BUREAU OF FISHERIES. 



In half an hour after being drained, pond 2, series E, which furnished the material 

 for the present paper, was entirely freed from Hydrous larvae, and they did not 

 appear in it again during the summer. After the larvae have been removed the fry 

 may be returned to the pond wiih safety. 



The adults, being vegetable eaters, do not kill fish except rarely, and then 

 in such small numbers that the loss is never serious. While Hydrous larvae have 

 become a nuisance several times in the Fairport fishponds and have necessitated 

 the removal of fish fry to other ponds, there has never been an instance when the 

 adult beetles have been known to attack the young fish. 



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