570 EEPORT OF THE COMMISSIONER OF FISHERIES. 



ous larva, small; alga*; line shell fragments with fine sand or mud, 

 forming a "grit." 



3. Specimen from St. Clair Flats, July 13, 1901. Large mass of 

 remains of Ephemerida, consisting for the most part of wings and of 

 more or less broken up cercopods. (Fore wings 18 mm. long; one 

 of the larger of the cercopods had 25 or 26 joints.) Very few other 

 parts of the insects in evidence, except small opaque bodies with ellip- 

 tical outlines, which were probablj^ the eyes. The fact that the insects 

 were adults would indicate that they were taken from the surface of 

 the water either at the time of metamorphosing or when blown into the 

 water later. '^ This one carp must have contained hundreds of these 

 insects. Prof. 11. H. Pettit, entomologist at the Michigan Agricul- 

 tural College, kindly examined the remains of these May flies (or 

 "June bugs") for me, but was unable to determine the species from 

 the material in hand. 



1. Specimen Jj.5 cm.^ long from North Bass Island, Lake Erie, July 

 19, 1901. Chara^ considerable; copepods and ostracods, numerous; 

 Chironomus larvffi or related forms; fragments of shells (mostly quite 

 small), considerable; plant libers. 



5. Specimen '27 cm. long from North Bass Island, Lake Erie, July 

 19, 190L Mass of food quite well digested. Much filamentous algae 

 {Sj)irogyra recognized) and diatoms. 



6. , Specimen 55. S cm. long from Put-in Baj^, July 27, 1901. C7iara, 

 bulk of material, packing intestine full in places, mostly in small 

 pieces less than 1 cm. long; Maj^-flj" larvas, 1 to li cm. long, large 

 numbers; shells, broken pieces, and small bivalves 2 to 4 mm. long, 

 entire; Ckara and considerable other vegetable matter, some of it 

 probably Pldlotria; mud, fine debris, evidentl}" bottom sediment. 



7. Specimen 33 cm. long from Put-in Bay, July 27, 1901. Chara.^ 

 mass of the material as in No. 6 ; amphipods, a number of small 

 IIy(dlela-\\k& individuals; broken shells, a very little; vegetable matter, 

 a little besides Chara. 



8. Specimen SS.5 cm. long from Portage River, about 3 miles above 

 Port Clinton, August 6, 1901. About 90 to 100 c.c. of rather fine, 

 dark material, composed almost entirel}^ of finely divided vegetable 

 matter. A few filamentous algae. 



9. Specimen 50.5 cm. long from Portage River, as above, August 

 6, 1901. A considerable quantity of blackish "mud", vegetable 

 fragments, pieces of stem, etc., the principal constituent; one pulpy 

 mass, apparently an unopened bud of some kind, possibly "lotus" 

 {ISFeJumho) or water-lily; insect larvje, occasional, head only recog- 

 nizable. 



« On Lake Erie I have seen windrows of the cast pupa cases of ephemerids being drifted about by 

 the wind, and extending as far as the eye could follow them. If carp could have got among these at 

 the time the insects were leaving they would have had abundance of food for a time. 



6 Length of fish if in italics means total length— i. e., tip of snout to end of caudal fin; if in Roman 

 type it is the length from tip of snout to base of caudal fin at middle. 



