FOOD OF FRESH-WATER FISHES. 709 



tweuty-live species are meutioned — nine of insects, four of Crustacea, one 

 worm, and eleven of mollusks ; and these are undoubtedly only a small 

 part of the species upon which the white-fish really feeds. 



Sucker, {Catostomus aureolus.) 



[No. 15.] Ecorse, Mich. Many specimens of partially-digested Asel- 

 lo2)sis tenax, var. dllata; and portions of a Corixa and of the larva of a 

 dragon-fly. 



Yellow Perch, {Perca fiavescens.) 



Buffalo. Bones of several small fishes ; spawn of some fish ; small 

 dijiterous larva. 



Sturgeon, {Acipenser ruMcundus.) 



[No. 118.] At Sand Island, Lake Superior, a specimen contained a 

 few bones of some fish and numerous shells, among which were the 

 following: Valvata tricar inata ; V.siiicera; Limmea catascojnum ; Physa, 

 sp. ; Planorhis bicarlnatus ; and Sj^licerium striaturum. 



Stomachs of Menobranclius lateralis, from Ecorse, Mich., contained a 

 number of specimens of a crawfish, [Cambarusproinmiuus ;) a neuropte- 

 rous larva allied to Perla; and the remains of a small fish. 



