12 
Bulletin Wisconsin Natural History Society [Vol. 13, No. 
The specific differences in food habits are well shown by com- 
paring the food of different species of fish taken at the same time 
and place. Thus on August 7 in Six-mile Creek (Station 1) : 
12 Micropterus salmoides, had eaten 49% Corixa; 5 Shilbeodes 
gyrinuSj 62% Cyclops; 16 Lepomis pallidus, 63.9% Chadocera; 
and 20 Labidesthes sicculus, 31.1% Cladocera. On August 17 
at Second Point (5) the following distribution of maxima was 
shown: 5 Micropterus salmoides, 66% fish; 5 Perea flavescens, 
33% dipterous larvae; Notropis heterodon, 98% mud; 10 Lepomis 
pallidus , 41.9% Cyclops. On August 3, in University Bay (8) 
the results were as follows: 2 Micropterus salmoides , 57.5% dipter- 
ous larvae; 4 Lepomis pallidus, 83.7% insect larvae; Labidesthes 
sicculus, 69.5% adult insects; Fundulus diaphanus menona, 63.8% 
Ostracoda. At Maple Bluff (4), August 25: 9 Cottus idalops, 
66% May-fly nymphs; 2 Boleosoma nigrum, 75% chironomid larvae; 
7 Notropis heterodon, 58.1% mud. These examples show that 
it was unusual to find the different species of fish caught at the 
same time and place preferring the same land of food. 
III. LIST OF SPECIES OF FISH, WITH SUMMARY OF FOODS 
All figures following foods are given in per cents, + means a 
trace. Lengths are given in millimeters. Insects means adults, 
which are listed separate from larvae. 
Boleosoma nigrum (Rafinesque). Johnny Darter. 
Station 3; September 4; No. collected, 2; length — max. 33.1, min. 32.6, 
ave. 32.9. 
Food — Cbironomus larvae, 75; midges, .5; Hyalella, 24.5; Campto- 
cercus, +. 
Boleichthys fusiformis (Girard). Darter. 
Station 10; October 3; No. collected, 7; length — max. 79.3, min. 58.4, 
ave. 72.4. 
Food — Chironomus larvae 82, Hemiptera nymphs .3, unidentifed in- 
sects 4.3, Midges .7, Diptera 1.3, Corixa .4, Hyalella 2.4, Ostracoda .1. 
Cyclops .3, Camptocercus + , unidentified debris 6. 
Summary — Insect larvae 84, insects 6.7, Hyalella 2.4, Ostracoda .1, 
Cyclops .3, Camptocercus +, unidentified debris 6. 
Lepomis pallidus (Mitchell). Bluegill. 
Station 1; August 7; No. collected, 16; length — max. 42.3, min. 21.3, 
ave. 27.7. 
