206 NEW YORK STATB MUSEUM 
In this table the food species have been arranged in what 
seemed to be the order of their importance as constituents of the 
food of the trout at the time and place taken. The totals, 
counting larvae and pupae of a species together, are 2906 
Chironomus, 156 Corethra, 14 trichopter larvae, 2 nymphs of 
Aeschna constricta, 7 nymphs of Callibaetis,8 Atax 
crassipes, 250 (approximately) Daphnidae, and a few wholly 
unimportant things listed as miscellanies. The numerical ratio 
of these is 116.24 Chironomus, 6.24 Corethra, 10 Daphnidae, .56 
trichopter larvae, .32 Atax, .28 Callibaetis, .08 Aeschna to each 
of the 25 trout. What may be the relative food value of these 
species is, of course, wholly undetermined. In arranging them 
in the foregoing table, I have taken into account only their 
relative size. I should be inclined to regard only the three 
first named in the table as of any considerable importance to 
the trout. 
To my mind the chief value of this table is that it clearly 
indicates one species of economic importance to trout culture— 
the Chironomid of whose larvae and pupae an average of 116 
Specimens had been eaten by each trout. The largest number 
eaten by a single trout was 351, while three trout had eaten 
none at all. It is possibly significant, possibly only accidental, 
that the May fly nymphs were eaten chiefly by those trout that 
had found no Chironomids. 
NOTES ON THE FOOD SPECIES OF THE TABLE 
1 Chironomus sp.? 
There can be no doubt that in Bone pond this is an exceed- 
ingly important species. Unfortunately, the day this fact be- 
came apparent, in the cursory examination of the food as taken 
from the stomachs, was the last day of study permitted us at 
the pond. What the species is, consequently remains unknown. 
Mr Johannsen has studied the larva and pupa systematically, 
and has treated them in part 3. His figures [pl]. 49] should 
make the recognition of the species possible when other larvae 
shall have been obtained and bred. 
