FOOD OF THE SHORE FISHES OF CERTAIN WISCONSIN LAKES. 275 



Station 5; August 18; number examined, 10. Length: Maximum, 27.8; minimum, 18; average, 

 22.3. Food: Chironomus fulviventris larvae, 3; C. digitatus larvae, 1.5; Tanypus decoloratus larvae; 

 2.5; Orthocladius sordidellus larvae, 2.5; May-fly nymphs, 3.5; Baetisca nymphs, 1.5; Caenis diminuta 

 nymphs, 10.5; Enallagma antennatum adult, 3.5; Hyalella, 27.3; ostracods, 3; Cyclops, 2; Chydorus, 

 phaericus, 0.5; Simocephalus, 0.7; Camptocercus, 2.3; oligochaetes, 31.4; seeds, i; Myriophyllum, 3; 

 sand, 0.3. 



Summary. — Food: Immature insects, 25; adult insects, 3.5; amphipods, 27.3; ostracods, 3; cope- 

 pods, 2; cladocerans, 3.5; oligochaetes, 31.4; plants, 4; sand, 0.3. 



Station $; September 15; number examined, i. Length: 59. Food: Insect larvae, 7; Hyalella, 

 55; ostracods, 8; cladocerans, 15; fine debris, 15. 



Grand summary for igi4 and igis. — Number examined, 55. Length: Maximum, 76; minimum, 14,- 

 average, 34.3 Food: Insect larvae, 36; pupae, 4.4; adult insects, 3.6; mites, +, amphipods, 10.3; 

 ostracods, 4; copepods, 7.9; cladocerans, 6.1; snails, o.i; oligochaetes, 18.3; plants, 5.9; algae, o.i; silt 

 and debris, 3. 



The tadpole cat feeds chiefly on insects (44 per cent), oligochaetes (1S.3 per cent), and small crus- 

 taceans (28.3 per cent). The items in its diet show that it gets its food on the bottom and among aquatic 

 plants. The smaller individuals apparenly depend upon crustaceans and oligochaetes, larger fishes 

 turn more to insects. Forbes and Richardson (1908) found this species feeding on amphipods 

 isopods, entoraostracans, insect larvae, and small fish. Hankinson (1908) found insect fragments. 



Stizostedion vitreum (Mitchill). Wall-eyed pike, pike perch, jack-salmon. 



Station 28; September 15, 1915; number examined, 2. Lengths: 448, 425. Food: Fish, 100. 



Station 29; November 14; number examined, 9. Length: Maximum, 520; minimum, 375; average, 

 441. Food: Rana pipiens, n.i; fishes (one a sunfish), 88.9. 



Grand summary. — Number examined, 11. Average length: 440. Food: Frogs, 9.1; fishes, 90.9. 



Forbes and Richardson (1908) stated that this species feeds chiefly on fish, sometimes varying its 

 diet with crayfishes. 



Umbra limi (Kirtland). Mud minnow, mudfish. 



Dato/or /p74 (Pearse, 1915). — Number examined, 60. Average length: 33.5. Food: Insect larvae, 

 21; adult insects, 16.3; mites, 0.3; amphipods, -f; ostracods, 33.9; copepods, 0.5; cladocerans, 1.2: 

 snails, 0.7; Sphaeridae, 0.2; oligochaetes, i; nematodes, 0.7; protozoans, 0.1; plant remains, 1.9; 

 algs, 15. 1. 



Station 21; April 28, 1915; number examined, 9. Length: Maximum, 80; minimum, 31; average, 

 51.1. Food: Insect larvae, 3; Platyphylax designatus larvae, 4.5; Chironomus viridis larvae, i; Tanypus 

 decoloratus larvae, 3.3; Pelopia flavifrons larvae, 3.3; Odontomyia larvae, 4.5; Haliplus adult, 0.2; 

 Corixa adult, 4; mites, 2; Hyalella, 12; Dikerogammarus fasciatus, 26; Cyclops, 0.3; C. viridis, 5.8; 

 C. fimbriatus, 5; cladocerans, 0.3 ; Chydorus sphaericus, 0.5; leech, 5.5; oligochaetes, 12; plant remains, 

 1.5; Pleurococcus, 2.5; diatoms, 0.5; silt, i; fine debris, i. 



Summary. — Food: Insect larvae, 19.6; adult insects, 4.2; mites, 2; amphipods, 38; copepods, 11. i; 

 cladocerans, 0.8; leech, 5.5; oligochaetes, 12; plants, 1.5; algae, 3; silt and d6bris, 2. 



Station 16: May 15; number examined, i. Length: 68.7. Food: Adult midges, 10; earthworm, 

 79; diatoms, i; silt and debris, 10. 



Station s; June i; number examined, 4. Lengths: 58, 60, 54, 49. S- Food: Insect larvae, 11; 

 chironomid larvae, 0.5; Chironomus lobiferus larvae, 2.2; Orthocladius sordidellus larvae, 20.4; chiron- 

 omid pupae, 9.6; Probezzia pupae, 0.6; adult weevil, i; adult midges, 6.2; ostracods, 4; Dikero- 

 gammarus, 1.2; Cyclops, I ; Chydorus, 0.2; Eurycercuslamellatus, 1.2; Physa, 1.7; seeds, 14; WolflBa, 

 2.5; plants, 0.2; filamentous algae, 0.3; Pleurococcus, 20; silt and debris, 2.5. 



Summary. — Food: Insect larvs, 34.1; pupae, 10.2; adult insects, 7.2; ostracods, 4; amphipods, 1.2; 

 copepods, i; cladocerans, 1.4; snails, 1.7; plants, 16.7; algae, 20.3; silt and debris, 2.5. 



Station 21; June 12; number examined, 10. Length: Maximum, 179; minimum, 35; average, 

 63.9. Food: Insect larvae, 1.5; chironomid larvae, 0.7; Chironomus larvae, i ; Chironomus fulviventris 

 larvae, 25; Palpomyia longipennis larvae, 3; Cricotopus trifasciatus larvae, 2.5; C. t. pupae, 8.7; chiron- 

 omid pupae, 4.3; adult midges, 11; mites, 0.3; ostracods, 0.1; Dikerogammarus, 26.9; Cyclops, 2.7; 

 Physa 0.8; Pleurococcus, 3.5; silt and debris, 7. 



