Description and Identification of Some Chironomid Egg Masses.

The identification of Chironomid egg masses is a definite problem for the biologists who are investigating the means for lessening stream pollution, particularly that caused by dairy wastes. In 1920-22 investigators were making a study of aquatic insects relative to stream pollution and for this study experimental pools were established at the Fish Hatchery of Cornell University. In these pools appeared egg masses differing from the species with which the pools were originally stocked.