FOOD OF THE SHORE FISHES OF CERTAIN WISCONSIN LAKES. 257 



Station 19; August 30; number examined, 2. Lengths: 33.5, 41. Food: Hyalella, 96; oligochaetes, 4. 



Station 19; August 31; ntunber examined, 2. Lengths: 30.5, 30.5. Food: Chironomus digitatus 

 larvae, 10; C. viridis larvae, 10; Caenis diminuta nymphs, 8.5; Hyalella, 68.5; Cyclops, 1; oligochaetes, 

 0.5; sand, 1.5. 



Station 14; August 31; number examined, i. Length: 35.5. Food: Chironomus digitatus larvae, 

 10; Baetisca nymphs, 30; Hyalella, 60. 



Station i; September i; number examined,!. Length: 35. Food: Chironomus digitatus larvae, 

 5; Baetisca nymphs, 15; Hyalella, 80. 



Station 11; September 2; number examined, 5. Length: Maximum, 46; minimum, 31.5; average, 

 40. Food: Chironomus digitatus larvae, 0.4; Heptagenia interpunctata larvae, 0.6; Hyalella, 98; ostra- 

 cods, I. 



Station 11; September 11; number examined, 2. Lengths: 49, 39. Food: Hyalella, 95; ostracods, 

 i; Nostoc, 4. 



Station i; October 2; number examined, i. Length: 48. Food: Dikerogammarus fasciatus, 100. 



Grand summary for igi4 and igi 5. — Number examined, 30. Length: Maximum, 57.5; minimum, 

 20.5; average, 39.6. Food: Chironomid larvae, 7.5; caddis-fly larvae, o.i; May-fly nymphs, 24; adult 

 midges, i; amphipods, 59.1; ostracods, 0.6; copepods, 1.2; cladocerans, o.i; oligochaetes, 0.7; leeches, 

 3; plant remains, 0.1; algae, i; sand, 0.2. 



The miller 's thmnb subsists mostly on amphipods and insect larvae. It evidently lurks tmder stones 

 and rushes out to capture small things which swim by. Forbes and Richardson (1908) examined six 

 individuals, and 25 per cent of the food consisted of small fishes, 40 per cent of insect larvae, and the 

 remainder mostly Asellus. They also stated that this fish was said to be very destructive to the eggs and 

 fry of trout. 



Cyprinus carpio Linnaeus. German carp. 



Station 23, in a little inland pool connected with Yahara Canal by a ditch; July 12, 1915; nmnber 

 examined, 4. Length: Maximum, 21.7; minimum, 18; average, 20.1. Food: Unidentified chironomid 

 larvse, 5.2; Probezzia pallida larvae, 2.5; Tanytarsus agrayoloides larvae, 10; Gyrinus larvae, 2.5; Dytiscus 

 hybridus larvae, 2.5; Diamesi waltii larvae, 4.2; D. waltii pups, 2.7; Palpomyia longipeimis pupae, 

 0.7; Leptocella uwarowii adult, 17.5; Collembola, 2.5; ostracods, 28.7; Cyclops, 2.5; Chydorus 1.2; roti- 

 fers, 13.7; colonial algae, 0.7; desmids, 0.2; Wolffia, 2.3. 



Summary. — Food: Chironomid larvae, 21.9; beetle larvae, 5; chironomid pupae, 3.2; adult insects, 

 20; ostracods, 28.7; copepods, 2.5; cladocerans, 1.2; rotifers, 3.7; plants, 2.5; algae, 0.9. 



Station 5; August 9; number examined, 18. Length: Maximum, 64; minimum, 15; average, 31.8. 

 Food: Helea larvae, 0.8; Chironomus fulviventris larvae, 7; C. lobiferus larvs, 2; Cricotopus trifasciatus 

 larvae, 0.3; Probezzia pallida larvae, 0.8; May-fly nymphs, 0.8; Caenis diminuta nymphs, 3; Berosus 

 larvae, 0.3; Haliplus larvae, 0.1; Corixa nymph, 2.7; Palpomyia longipennis adults, 0.3; C. fulviventris 

 adults, 2.5; Corethra adults, 2.5; Dytiscus adults, 2.5; Hyalella, 16.3; ostracods, 9.4; Cyclops, 14; Can- 

 thocamptus, 0.5; mites, 1.7; Ceriodaphnia, 1.4; Chydorus, 3.7; Camptocercus, 0.8; Pleiu-oxus, 0.7; un- 

 identified cladocerans, 0.8; ephippial eggs, 0.5; unidentified snalis, 6.4; Physa, 1.6; Planorbis, 2; oli- 

 gochaetes, 6.3; Pleurococcus, 1.4; Wolffia, 4.7; plant remains, 1.6. 



Summary. — Food: Insect larvae, 17.7; adult insects, 7.8; mites, 1.7; Hyalella, 16.3; ostracods, 9.4; 

 copepods, 14.5; cladocerans, 7.9; snails, 9; oligochaetes, 6.3; algae, 1.4; plants, 6.3 



Station 23 , in a little inland pool connected with Yahara Canal by a ditch ; August 1 1 ; number ex- 

 amined, 18. Length: Maximum, 44.6; minimum, 21; average, 29.3. Food: Insect eggs, 0.6; Chironomus 

 fulviventris larvae, 53.1; C. lobiferus larvae, 5; C. tentans larvae, 2.5; Palpomyia longipennis larvae, 

 0.5; May -fly nymphs, i; Canis diminuta nymphs, 4. 9; Naucoris larva, 0.1; Chironomus fulviventris 

 pupae, 7.2; adult insects, i ; Haliplus maculatus adults, 1.5; Chironomus fulviventris adults, 0.3 ; Corethra 

 adults, 1.5; mites, 2.8; ostracods, 0.3; Cyclops, 8.9; Ceriodaphnia, 0.3; Chydorus, 0.5; Cladoceran, 0.1; 

 snails, 0.8; Physa, 0.8; Planorbis, 4.3; rotifers, -|-; Difflugia, -1-; filamentous algae, 0.3; plant remains, 

 0.2; silt, 0.3. 



Summary. — Food: Insect larvae, 67.6; insect pupae, 7.2; adults, 4.3; mites, 2.8; ostracods, 0.3; cope- 

 pods, 8.9; cladocerans, 0.9; snails, 5.9; rotifers, -\-; protozoans, -\-; algae, 0.3; plants, 0.2; silt, 0.3. 



Station 28; September 14; niunber examined, i. Length:46o. Food: Chironomid larvae, i;ostracods, 

 i; Cyclops, 2; plant remains, 61; duckweed, 7; blue grass, 8; fine silt and debris, 20. 



