266 BULLETIN OF THE BUREAU OF FISHERIES. 



found insect larvas, midges, and crayfish; after the middle of May, crayfishes, grasshoppers, crickets, 

 beetles, and entomostracans. Reighard (1913) found the bluegill only in shallow water among vegeta- 

 tion. Its food was plants, bryozoans, insects, mites, and ostracods. 



Micropterus dolomieu Lac6p6de. Smallmouth black bass. 



Data for igi4 (Pearse, 1915). — Stations 19 and 24; number examined, 2. Lengths: 78, 59. Food: 

 Dipterous larvae, 10; adult Diptera, 5; Corixa, 85. 



Station 28; August 19, 1915; number examined, I. Length: 181. Food: Minnow, 40; Chironomus 

 lobiferus larviE, 5; Corixa adults, 15; plant remains, 5; algae, 10; silt and debris, 25. 



Station 24; August 19; number examined, 3. Lengths: 175, 148, 132. Food: Fish remains, 29.9; 

 Lepomis incisor, 30; May-fly nymphs, 5; Corixa adults, 32.6; plant remains, 1.3; filamentous algse, i. 



Station 12; August 20; number examined, 8. Length: Maximum, 48.5; minimum, 29; average, 36. 

 Food: Chironomus digitatus larvae, 20; Bsetisca nymphs, 22.5; Caenis diminuta nymphs, 0.3; Ecdyurus 

 maculipennis nymphs, 9; Chironomus lobiferus pupae, 2: C. digitatus pupae, 7; C. flavescens adults, 

 5.6; Limnephilus adult, 2; Corethra adult, 17; Daphnia longispina hyalina, 4; Eurycercus lamellatus, 

 0.2; Ceriodaphnia, 1.8; Bosmina, +; oligochaetes, 8.6. 



Summary. — Food: Insect larvae, 51.8; pupae, 9; adult insects, 25.2; cladocerans, 6; oligochaetes, 8.6. 



Station 14; August 31; numlaer examined, I. Length: 33.5. Food: Protenthes culiciformis larvae. 

 40; Chironomus viridis pupae, 18; C. lobiferus pupae, 19; Tanytarsus monilis pupae, 18; Eurycercus, 5. 



Summary. — Food: Insect larvae, 40; pupae, 55; cladocerans, 5. 



Grand summary for igi4and igiS- — Number examined, 15. Length: Maximum, 181; minimum, 29; 

 average, 72.5. Food: Fish, 14.7; insect larvae, 33.1; pupae, 7.6; adult insects, 32.1; cladocerans, 3.4; 

 oligochaetes, 4.6; plants, 0.6; algae, 0.8; silt and debris, 1.5. 



The food of the young smallmouth black bass apparently consists largely of insects and their larvae. 

 Adults eat fish, crayfish, frogs, and plants as well. Forbes and Richardson (1908) examined only three 

 specimens and found one-third fishes and two-thirds crayfishes. Tracy (1910) reports small fish, insects 

 and their larvae, and crustaceans. Reighard (1915) examined eight and found crayfish, a frog, and fishes. 



Micropterus salmoides Lac^p^de. Largemouth black bass. 



Data for IQ14 (Pearse, 1915). — Number examined, 25. Length: 64.4. Food: Fish, 17.8; insect 

 larvae, 31.6; adult insects, 40.6; Hyalella, 3.8; copepods, +; cladocerans, 2.5; plants, 1.6. 



Station 71; April 17, 1915; number examined, I. Length: 225. Food: Fish 95; leech, 5. 



Station 17; April 25; number examined, i. Length: 470. Food: Ostracods, o.i; diatoms, 0.4; 

 Aphanothece, 20; filamentous algae, 24.5; plant remains, 50; debris, $■ 



Summary. — Food: Ostracods, o.i; algae, 44.9; plant remains, 50; debris, 5. 



Station 3; June 24; number examined, i. Length: 81. Food: Ecdyiu^s maculipennis nymphs, 

 lo; Enallagma antennatum nymphs, 20; dipterous adult, 5; Corixa adult, 30; crayfish, 20; Hyalella, 15. 



Station 23; July 9; number examined, 3. Lengths: 32, 30.3, 29.5. Food: Chironomid larvae, 

 10; Chironomus fulviventris larvae, 6.3; C. tenellus larvae, 17; C. tentans larvae, 0.6; May-fly nymphs, i; 

 Dytiscushybridus larvae, 5; Chironomus tenellus pupae, 16; adultmidges, 6.6; Simulium vitattum adults, 

 8.3; Cyclops, 20; Chydorus sphaericus, 2; ephippial eggs, 0.2; oligochaetes, 6.6; Oscillaria, 0.3. 



Summary. — Food: Insect larvae, 39.9; pupae, 16; adult insects, 8.3; copepods, 20; cladocerans, 2.2; 

 oligochaetes, 6.6; algae, 0.3. 



Station 23; July 12; number examined, i. Length: 33. Food: Chironomus fulviventris larvae, 

 35; Anax Junius nymphs, 8; C. fulviventris pupae, 20; Corixa adult, 7; oligochaetes, 30. 



Station 5; August 9; number examined, I. Length:4i.6. Food: May-fly nymphs, 65; Hyalella, 35. 



Station 17; August 23; number examined, I. Length: 147. Food: Adult dragon fly, 100. 



Station 23, in pool in Tenney Park; August 11; number examined, I. Length: 62. Food: Cyclops, 

 65; Simocephalus, 10; Eurycercus lamellatus, 25. 



Station 3; August 18; number examined, 12. Length: Maximum, 62; minimum, 38.3; average, 

 50.8. Food: Chironomus fulviventris larvae, 0.3; Baetisca nymphs, 23.2; Caenis diminuta nymphs, 3.6; 

 Corixa nymphs, i.i; C. lobiferus pupae, 0.8; Corixa adults, 30; Micronecta adult, 0.4; Hyalella, 25; 

 ostracods, 0.3; Eurycercus lamellatus, 12.4; ephippial eggs, 1.2; seeds, 0.2. 



Summary. — Food: Insect larvae, 29.4; pupae, 0.8; adult insects, 30.4; Hyalella, 25; ostracods, 0.3; 

 cladocerans, 13.6; plants, 0.2. 



