Abstract
The seasonal distribution of certain limnologically important species of midge larvae, which seems to vary from one lake to another, is incompletely understood. During the course of an ecological study on the food-cycle dynamics of Cedar Bog Lake, Minnesota, the author has been able to assemble quantitative seasonal data over a four-year period on seven important species of lacustrine larvae. It has been found that neither quantitative observations on larval populations nor the periodic collection of adults alone is adequate to determine the seasonal distribution of these species. Recognizing this, the author in 1939 and 1940 attempted to combine the above methods, and also to rear under controlled conditions the larvae of certain species captured at various intervals.
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