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 with safety. 
The adults, being vegetable eaters, do not kill fish except rarely, and them 
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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