The Relation of Mollusks to Fish in Oneida Lake 209 
Insecta. Chironomus lave s-. - atis select te l= os 2462 
CRAMGNOMIAS HOU eitenns Sat xe Ae eS eth cas) oh 444 
WOnCERMUM Arve see ara fs 6 2 ake heel ere a a a's 64 
CorethTas Pups. a-t-kaiescrl ioe ier ee oe ee et 92 
rnichopters lary ceo elie: a cls at uss oe l= 10 
Ibera@ Oe WOES Gos how ao ob Oldie cope adne 4 
LEICHOPTCIMEASGS ate se tae ve cote cee 2 kale 77 
VE SCNMAD CONS ULUCU ate tea adie ele ee ds tee 2 
Galibgztish myn ery et baat eas hes ay) yk ey 7 
Miscellaneous material ................... 9 
GEnsuaced. Map nmi. ares co lelensilete ars exe a' wine oo me yep 250 
Acarina. JNU CRUST YUGS cco to dbice Sha. cmogeconionenee 8 
Mollusca. “bresh water mussels. ¥22)es-2-2--5.. >= - 1 
The value of the chironomids forming 82 per cent. of 
the food of this trout, is at once manifest. The mollusk, 
as well as some of the miscellaneous material, was doubtless 
picked up eee with the Chironomus larvee. 
Bean (1912, p. 203) speaking of fish food, says ‘* the best 
of all the foods for trout are insects, their larvie, small shells, 
erawfish, ete., which are found in eood trout streams. Cer- 
tain waters contain small crustaceans, including the so-called 
fresh-water shrimp, and many smaller forms which are excel- 
lent for trout. Important trout foods are snails, dragon-flies, 
May-flies and caddice flies. * * * The snails, of which 
the Planorbis is now most abundant in some lakes, are excel- 
lent food for trout. Mr. L. M. Deming, of Edmeston, N. Y., 
sent to the Commission, on May 25, 1911, a snail which 
forms an important part of the food of brook trout in a pond 
belonging to him. He writes that he caught trout from 914 
to 11 inches long on May 25. Their stomachs all contained 
bugs, insect lprvcand trom sto 1¢ coal =) = One 
of “the trout examined by him on May 25 had eaten 16 
snails, 1 June bug, 2 insect larvee — each about 1 inch long, 
with a hard shell (probably a eaddice fly larva), 1 hard shell 
and a lot of small flies and bugs.” The molluscan food ratio 
of this fish must have been as high as 10 per cent. The snail 
was identified as belonging to the genus Planorbts. In the 
N. Y. Conservation Report for 1912 (p. 269) the statement 
is also made, in speaking of the Brook Trout, that “a large 
part of its food consists of insects and their larvee, worms, 
