FOOD OF THE YELLOW PERCH 217 



Hyalella. There Avere also a few members of other groups of 

 the Crustacea. Hydrachiiids were found in two. From the 

 above w^e may conclude that in both volume and number, fish. 

 fish eggs, and Crustacea play an important part in the food of 

 the perch in Cayuga lake during the first half of the summer. 



I am greatly obliged to Dr. Needham, Dr. Johannsen and Mr. 

 Lloyd of the Department of Entomology. Cornell University, for 

 assistance in identifying material in which they are specialists. 

 and to Dr. Embody, under whose direction the work was under- 

 taken, I am especially indebted for kind assistance in the prepa- 

 ration of this paper. 



The contents are summarized in the following table : 



