XXVIII.-FOOD OF FRESH-WATER FISHES. 



By Sidney I. Smith. 



The following uotes were made almost wholly from the contents of 

 the stomachs of a few fresh- water fishes collected by Mr. J. W. Milner. 



[Xumbers iu brackets ([ ]) are the iinmbers unilor wliicli specimcus were received.] 



White-fish, {Goregonus aJbus.) 



[No. 202.] Specimens from Outer Island, Lake Superior, contained 

 great quantities of Mijsis relicta ; Fontoporcia Hoyi ; mid Pisidium abdi- 

 fam, var. ahyssorum ; and with these were a few specimens of dipterous 

 larvie of the genus Chironomus ; a small worm, {Lunibricus lacustris ;) 

 Daphnia galeata ; D. peUucida ; and a small species of Planorhis. 



[No. 115.] From Sand Island, Lake Superior, Pontoporeia Hoyi; 

 larvae and pupjc of Chironomus; Valvata sincera ; and Gyraulus parvus. 



(Xo number.) From Sault Salute Marie, one lot contained scarcely 

 anything but small shells. Among these, Valvata tricarinata ; V. sincera, 

 \ar.striateUa ; Amnicola generosa ; A.paVida (?); Gyraulus parvus ; and a 

 species of Limnwa^^vQ iu abundance ; while there were fewer specimens 

 of Goniobasis livescens ; Physa vinosa (!),young; Sphceriwn striatinum ; 

 and Pisidium compressum. 



[Xo. 107.] Other specimens contained nothing but the remains of 

 insects, among which were the imagos of two species of Diptera ; larvaj 

 and pupie of Chironomus ; larvte and pupjc of some specimens of Ephe- 

 merida' ; great numbers of the larvae, pui)a^, and subimagos of a species 

 of Hydropsyche ; and the larva? of a species of some other genus of Phry- 

 gaimda\ 



[Xo. 380.] From Ecorse, Mich., specimens contained a species of 

 Hydrachia, the leg and the scales from the wing of some lepidopterous 

 insect, and a species of Limna'a. 



White-fish which I examined at lie Eoyale, in August. 1871, con- 

 tained scarcely anything but Mysis relicta and Pontoporeia Hoyi. 



[No. Co.] Ecorse, Mich. Eemains of a small fish and several speci- 

 mens of a species of water-boatmen, {Corixa.) 



Specimens of Coregomis quadrilateral is from Madeline Island, Lake Su- 

 perior, contained a number of specimens of a leech {J^ephelis fervida) 

 and a neuropterous larva allied to Perla. 



These few observations are snfiicient to show that the white-fish, like 

 the different species of trout, feeds on a large number of species be- 

 longing to very different groups of animals. In this brief enumeration, 



