The Relation of Mollusks to Fish in Oneida Lake 167 
J. E. Reighard (1915, p. 223-224) examined 5 young 
suckers from Douglas Lake, Mich., (43-50 mill. long) in 
September and found their food to consist almost wholly of 
a Cladoceran, apparently Chydorus, only two or three Cope- 
pods being present. The adults examined all had empty 
stomachs. In this case the food of the young agrees with 
those from Oneida Lake, both feeding upon Crustacea. 
Forbes (1888, a, p. 513) did not have sufficient material 
from which to judge of the food of this species. Unio is 
recorded as being found in June and Spherium in October 
in the stomach contents. From the data presented above it 
is evident that the food of the Common Sucker varies with 
the locality. When the water is shallow and there is a good 
bottom fauna, this appears to be its natural feeding ground. 
It is probable that the detritus layer of the bottom also plays 
an important part in the food economy of this species. 
Catostomus nigricans (LeSueur). Hogsucker; Stone 
Roller. 
The food of this sucker consists almost entirely of aquatic 
insect larvee (92 per cent.) only an insignificant ratio of mol- 
lusks being eaten. This sucker, says Forbes (1909, pp. 
87-88) “is, in short, a molluscan feeder which has become 
especially adapted to search for insect larvee occurring in 
rapid water under stones.” May-flies, principally Canis, 
form the chief food. Bean (1903, p. 104) says “‘ the food 
consists of insect larvee and small shells.” 
Moxostoma aureolum (LeSueur). Common Red Horse. 
Forbes (1888, a, p. 443) examined 17 specimens of this 
species and remarks “the salient features of the food of 
Moxostoma macrolepidotum (== aureolum) as exhibited by 
12 specimens examined, are the abundance of univalve Mol- 
lusca and the bivalve Sphewrium, the insignificance of the 
vegetable element, and the absence of Crustacea and the 
larger and more active insect larvee. The insect food con- 
sisted almost wholly of larvee of Chironomus and other small 
