FOOD OF FRESH-WATER FISHES. 709 



tweaty-tive species are mentioned— nine of insects, fonr of Crustacea, one 

 worm, and eleven of moUusks ; and these are uudoubtedly oulj' a small 

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



Sucker, (Catostomiis aureolus.) 



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

 lopsis tenax, var. dilata ; and portions of a Corixa and of the larva of a 

 dragon-fly. 



Yellow Perch, {Ferca flavescens.) 



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

 dipterous larva. 



Sturgeon, {Acijyenser ruhicundus.) 



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

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

 following: Valvatatricarinata; Y. sincera ; Limncsa catascojyium ; Physa, 

 sp. ; Planorhis bicarinaUis ; and Sphcerium striaturum. 



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

 number of specimens of a crawfish, {Camharus inopinqiuis ;) a neuropte- 

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



