14 
Bulletin Wisconsin Natural History Society [Vol. 13, No. 1 
Station 8, inside bar; September 1; No. examined, 3; length — max. 68.4, 
min. 55, ave. 61.5. 
Food — Dipterous larvae 10, Corixa nymphs 3.3, May-fly larvae 58.3, 
midges 12.6, Hyalella 9.7, Cyclops .3, Alona .6, Chydorus .6. 
Station 5; August 17; No. examined, 4 (2 empty); length — max. 103, 
min. 55, ave. 81.7. 
Food — Fish 66, midges 23, chalcids 10. 
Station 6; September 5; No. examined, 5; length — max. 101, min. 53.2, 
ave. 83.1. 
Food — Fish 34, dipterous larvae 4.6, unidentified insects or insect larvae 
21.1, midges 23, Ceriodaphnia 10, plant tissue 7.4. 
Station 1; August 6; No. collected, 12; length — max. 95, min. 67.6, 
ave’. 79.1. 
Food — Fish 6.3; unidentified insect larvae .9, dipterous larvae 1.3, Corixa 
nymphs .4, dragon-fly larvae 5.9, may-fly larvae 28, Corixa 49, Hyalella 1. 
Summary — Fish 6.3, insect larvae 36.5, Corixa 49, Hyalella 1. 
Grand Summary — No. examined 27; length — max. 103, min. 54, ave. 
77.8. Food — Fish 14.2, insect larvae 31.2; Insecta 38.6, Hyalella 3.8, 
Cyclops +, Cladocera 2.5, plant tissue 1.6. 
Micropterus dolomieu Lacepede. Small-mouthed Black Bass. 
Two individuals, lengths 69 and 88 were collected at stations 5 and 10 
and on August 17 and October 3. The first had eaten — 20% dipterous 
larvae 10% diptera, and 70% Corixa; the second — 100% Corixa. Thus 
the food of the two individuals consisted of 90% insects and 10% dipterous 
larvae. 
Ambloplites rupestris (Rafinesque) . Rock Bass. 
Two individuals collected at station 7 on August 17 (lengths, 104 and 
82) had eaten 99.5% insects and .5% may-fly larvae. Two others taken at 
station 5, August 17 (lengths, 82.5 and 40) showed — 5% Chironomus larvae, 
20% insects, 30% wasp, 1% mite, 4% Hyalella, 2.8% Ostracoda, 37.5% 
Sida. One individual collected at station 9, October 3 (length 49.7) had 
eaten 40% Corixa, 20% Hyalella, 20% plant tissue, 1% filamentous algae, 
and 2% silt. 
Grand summary — No. examined, 5; length — max. 104, min. 40, ave. 
71.6. Food — Insect larvae 2.2, Insecta 68, mites 4, Hyalella 5.6, Ostracoda 
1, Cladocera 15, plants 4.2, silt .4. 
Roccus chrysops (Rafinesque). White Bass. 
Two specimens (lengths 303 and 320) caught with hook and line between 
stations 3 and 4, on August 28 had eaten nothing but midges. 
