Abstract
In a previous paper (’14), the writer reported the results of some observations on Hydromyza confluens , an aquatic dipterous insect which occurs abundantly about Douglas Lake, Northern Michigan. Parts of two seasons have since been spent in the same region and additional data, as well as confirmation of previously recorded observations, have been secured. The new material incorporated in this paper not only aids in completing our knowledge of the life history of this form but also throws new light on the interesting adaptations already described.
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