188 College of Forestry 
Intestine packed with mollusks including a large amount 
of broken shells, this group making up over 95 per cent. of 
the total mass. 
No. 10 (309). 80 mill. long. Stomach empty. 
No. 11 (309). 80 mill. long. 
Mollusea. 11 Amnicola lustrica... 
4 Planorbis antrosus.. 70.00 per cent. 
1 Planorbis parvus.... 
Mass of broken shells. 
Insecta. 2 caddis-fly cases Rhepies 
COLLG)eceauear ae 3.00 per cent. 
Crustacea. Amphipod fragments. . 
1 Copepod. 21.50 per cent. 
Bryozoa. 3 Plumatella ‘statoblasts. .50 per cent. 
Plants. AEE onond CoO a OCS Ra OUON c 5.00 per cent. 
GROUP 3. INFANCY. 
No. 12 (309). 44 mill. long. 
Crustacea. 100 Alona. . 
90 per cent. 
8 Cyclops. sueiks 
Bryozoa. 6 Plumatella statoblasts. 5 per cent. 
Plants. ign. Saee- be ec eae 5 per cent. 
To summarize, the Pumpkinseed of Illinois waters, Doug- 
las Lake, Mich., Mendota Lake, Wisconsin, and Oneida Lake, 
New York, are largely mollusk eaters. Those of Walnut 
Lake, Mich, are insect eaters. There may be some, as yet 
unknown, factors which cause this variation in the food of 
a typical mollusk-eating fish. It cannot be lack of mollusks 
in this lake because eight or more available species are known 
to live in the lake (Hankinson, 1908, p. 235). As bottom 
inhabitating insect larvee are present and eaten there must be 
some selection by the fish. 
Micropterus dolomiew (Lacépéede). Small-mouthed Black 
Bass and 
Micropterus salmoides (Lacépéde). Large-mouthed Black 
Bass. 
In the Manual of Fish Culture of the U. S. Bureau of 
Fisheries, 1900, page 153, the food of the adult black basses 
is said to consist of: ‘“‘ Crayfish, minnows, frogs, tadpoles, 
