FOOD OF THE YELLOW PERCH 215 



1 Trichopterous larva. 



1 stickleback {Eucalia mconstans), 1 1-lG inches long. 



12. 6% inches long. 



Contents very well digested. Parts of at least 3 small fish. 

 A few Crustacean appendages. 



9 small eggs. 



13. 6% inches long. 



A minnow wound doubled up which was almost as long as the 

 perch itself. 

 1 egg. 



14. 6 inches long. 



1 Cambarus propinqus. 



20 to 25 Leptocerid, (Trichoptera), larvge. These were fairly- 

 well digested so that no accurate count could be made. 

 Tneir cases of vegetable matter "were also present. 



15. o~/s inches long. 



1 Orthoclaclius larva, (Chironomidae). 



2 Chironomus larvae, (Chironomidae). 

 2 Chironomus pupae, (Chironomidae). 

 Part of an insect larva. 



10 Leptocerid larvae similar to those found in the preceding 

 stomach. 



2 young perch, each about 1 inch long, very well digested. 



2 Cypridid^ (Ostracoda). 



2 Minnow? eggs. 



Seed of an aquatic plant, (accidental). 



16. 6% inches long. 



2 Gamharus propinqus, one 11,4 inches long, the other slightly 

 less. 



At least 6 Hyalella knickerbockeri, (Crustacea allied to 



Gammarus) . 

 1 Chirono7nus larva, the head of another. 

 12 fish eggs. 



17. 6 inches long. 



10 Cyclops. 



3 Daphnia. 



1 Eiic-rangonyx, (Crustacea closely related to Gammarus) . 



28 fish eggs. 



12 Eucalia inconstans, (brook stickleback). 



4 Leptocerid larvae, (Similar to preceding ones). 

 Numerous Crustacean fragments and appendages. 



18. 6 inches long. 



1 Cambarus propinqus. 

 75 Gavimarus fasciatus. 



4 Hyalella knickerbockeri. 



2 Chironomus larvae. 

 1 Chironomid larva. 



. 1 Chironomid pupa. 



