: 115 
The crustacea were limited to small crawfishes (two per cent.), a 
‘trace of Allorchestes, and a few Aselli (four per cent.). 
On comparing specimens from Northern Illinois with those taken 
from the Illinois River in the same month, I find that there are no 
common seasonal food characters, and that the differences of food 
are therefore due to difference of locality and not to difference of 
time represented by the groups. Concerning the entire number of 
adults, we can therefore say that their food ranges through the 
whole list of the smaller mollusks, terrestrial and aquatic insects, 
and smaller crustaceans (above Entomostraca) accessible in their 
localities, and that they feed largely on aquatic vegetation, A strik- 
ing negative feature is the almost total absence of fishes in the 
pacar fact which corresponds with the relatively small size of the 
mouth. 
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