FOOD OK THE SHORE FISHES OF CERTAIN WISCONSIN LAKES. 255 



Station 22; July 8; number examined, i. Length: 420. Food: Fish remains, 100. 



Station 22; July 15; number examined, i. Length, 412. Food: Fish remains, 100. 



Summary for jgis and JQ16. — Number examined, 16. Length: Maximum, 465; minimum, 383; 

 average, 467.4. Food: Fish remains, 90.1; crayfish remains, 9.4. 



It will be observed that no young dogfish were examined. Forbes and Richardson (1908) examined 

 20 fish and found the food to be entirely animal — one-third fishes, one-fourth small molluscs, and about 

 40 per cent crayfishes. A few amphipods, isopods, and entomostiacans were also noted (Forbes, 1883). 



Boleosoma nigrum (Rafinesque). Johnny darter. 



Station 14; July 9, 1915; number examined, i. Length, 15. Food: Cricotopus trifasciatus larvae, 

 10; oligochaetes, 55; Cyclops, 20; Chydorus, 15. 



Station 5; August 18; number examined, i. Length, 30. Food: Helea larvae, 15; Tanypus car- 

 neus larvae, 25; May-fly nymphs, 10; oligochsetes, 15; ostracods, 15; Chydorus, 20. 



Station 19; August 18; number examined, 10. Length: Maximum, 34.5; minimum, 23; average, 

 28.7. Food: Tanypus monilis larvae, 2.4; Chironomus digitatus larvae, 53.3; C. viridis larvae, 2.4; 

 C. lobiferus larvae, 2.5; C. tentans larvae, 1.5; Ecdyurus maculipennis nymphs, 6.5; C. digitatus pupae, 

 1.5; oligochaetes, 15; Hyalella, 2.8; Cyclops, 4.7; Chydorus, 1.3; Pleuroxus, + ; Ceriodaphnia, 1.6; 

 sand, 4.7. 



Summary. — Food: Chironomid larvae, 63.1; May-fly nymphs, 6.5; chironomid pupae, 1.5; oligo- 

 chaetes, 15; amphipods, 2.8; copepods, 4.7; cladocerans, 2.9; sand, 4,7. 



Station 19; August 20; number examined, 20. Length: Maximum, 32; minimum, 21.5; average, 

 27.5. Food: Probezzia pallida lar\'ae, 0.7; Tanypus monilis larvae, 1.2; Chironomus digitatus larvae, 

 46; C. viridis larvae, 3.5; C. lobiferus larvae, 8.1; Leptocerus dilutus larvae, 0.2; C. digitatus pupae, 2; 

 adult midge, 0.2; oligochaetes, 22.4; mite, -f; Hyalella, 0.2; ostracods, 0.2; Cyclops, 8.1; Chydorus, 

 o.i; Pleuroxus, +; Ceriodaphnia, 1.5; Eurycercus, 0.7; Daphnia, i; sand, 1.9. 



Summary. — Food: Chironomid larvae, 59.5; caddis-fly larvae, 0.2; chironomid pupae, 0.2; adult 

 midge, 0.2; oligochaetes, 22.4; mites, +; amphipods, 0.2; ostracods, 0.2; copepods, 8.1; cladocerans, 

 0.4; sand, 1.9. 



Station 10; August 20; number examined, i. Length: 30. Food: Chironomus digitatus larvae, 20; 

 oligochaetes, 42; Hyalella, 10; Cyclops, 15; Chydorus, 3; Ceriodaphnia, 10. 



Station 12; August 20; number examined, i. Length: 32.5. Food: Chironomus digitatus larvae, 

 60; Hyalella, 30; Eurycercus, 10. 



Station 5; August 25; number examined, i. Length, 38.2. Food: Chironomus digitatus larvae, 

 47; C. lobiferus larvae, 40; oligochaetes, 5; ostracods, 3; Cyclops, 5. 



Station 5; August 30; number examined, i. Length: 41.5. Food: Chironomus lobiferus larvae, 

 10; Protenthes culiciformis larvae, 10; oligochaetes, 47; Cyclops, 30; diatoms, 3. 



Station 14; August 31; number examined, 3. Lengths: 41, 36.5, 29; average, 35.6. Food: Chiron- 

 omid larva, 5; Cricotopus trifasciatus larva, 2.3; Chironomus digitatus larvae, 35; C. viridis larvae, 2.3; 

 Protenthes culiciformis larvae, 2.3; mites, 0.3; Hyalella, 15; Cyclops, 8; Chydorus, 18; sand, 10. 



Summary. — Food: Chironomid larvae, 46.9; mites, 0.3; amphipods, 15; copepods, 8; cladocerans, 

 18; sand, 10. 



Station i; September i; number examined, 10. Length: Maximum, 48.5; minimum, 27.5; average, 

 34.9. Food: Cricotopus trifasciatus larvae, 1.4; Chironomus digitatus larvae, 41.5; C. viridis larvae, i.i; 

 C. lobiferus larvae, 7.4; C. tentans larvae, 3.5; Corethra larvae, 0.2; Ctenis diminuta nymphs, 0.5; C. 

 digitatus pupae, 1.5; oligochaetes, 13.7; Hyalella, 13.9; Cyclops, 5; Chydorus, o.i; Pleuroxus, 0.2; 

 Eurycercus, 6.3; cladoceran, 0.1; sand, 3.5. 



Summary. — Food: Chironomid larvae, 55.1; May-fly nymphs, 0.5; chironomid pupae, 1.5; oligo- 

 chaetes, 13.7; amphipods, 13.9; copepods, 5; cladocerans, 6.7; sand, 3.5. 



Station 5; September 2; number examined, 2. Lengths: 41, 31. Food: Insect eggs, 2.5; Probezzia 

 pallida larvae, 11; Chironomus digitatus larvae, 5; C. lobiferus larvae, 45.5; C. tentans larvae, 21.5; adult 

 midge, 0.5; oligochaetes, 5; Cyclops, 5; cladoceran, i; sand, 3. 



Summary. — Food: Chironomid larvae, 85.5; midge, 0.5; oligochaetes, 5; copepods, 5; cladocerans, 

 i; sand, 3. 



Grand summary. — ^Number examined, 50. Length: Maximum, 48.3; minimum, 21.5; average, 

 30.9. Food: Insect larvae, 59.2; insect pupae, 1.4; adult insects, 0.1; oligochaetes, 18.4; amphipods, 

 5.1: ostracods, 0.5; copepods, 7.4; cladocerans, 5.6; diatoms, -\-; sand, 3.1. 



