The Food of Fishes. 59 



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— the second to the stout, blunt pharyngeal teetli — a char- 

 acter used in defining the genus. In all the preceding 

 . species the pharyngeals are set with more slender, pointed 

 teeth. 



EUPOMOTIS PALLIDU8 Ag. PaLE SuNFISH. 



Having but few specimens of this rather uncommon 

 species, I have examined the food of but one, — enough to 

 indicate that it probably agrees closely with the preceding 

 species. 



This fish, taken in Clear Lake, Ky., had eaten largely of 

 small Mollusca, — young Unionida^, Planorbis, Amnicola, 

 etc. These amounted to seventy-five percent, of the food. 

 The remaining elements were Chironomus larvae, several 

 small water-beetles, {Hydroporus hyhridus^ Cnemklotus 

 12-pioictatus, and Haliplus^ sp.), an unknown aquatic pupa 

 and a little pond-weed. 



Centrarchus IRIDEU8, Lac. 



This little species is found in considerable numbers in 

 ponds and streams in the southern hill-country of Illinois. 

 My specimens, all taken in July, are from ponds and 

 streams in the Mississippi bottoms in Union and Jackson 

 counties, and from Cache R. and its tributaries in Johnson 

 county. 



Five of the young, from three-fourths of an inch to an 

 inch in length, had eaten seventy-one per cent, of Ento- 

 mostraca and twenty-one per cent, of larvae of Chironomus 

 and, for the rest, about equal quantities of Ephemerid 

 larva? and young AUorchestes, with a trace of water mites 

 (Hydrachnidae). 



Thirty-eight per cent, of the food was Cyclops; Cyprids 

 amounted to twenty-one per cent. ; and twelve per cent, 

 of Simocephalus completed the ratio of Entomostraca. 

 The smallest specimen, three-fourths of an inch long, had 

 eaten sixty per cent. Simocephalus and forty per cent. 

 Cyclops. 



About a fifth of the food of one specimen, an inch and 

 an eighth in length, consisted of minute young Corixas, 

 the remainder being about equally Cyclops and Cyprids. 



