Abstract
In an earlier paper (Berg, 1949) 32 species of insects intimately associated with plants of the genus Potamogeton in Michigan were listed. Species of plants and areas in which they were collected were recorded. The insects, including Diptera of 17 species, were dismissed with a few general remarks concerning aquatic adaptations, modes of hibernation, and injuries inflicted upon host plants. Biology and morphology of immature stages of nine species of Chironomidae reared from Potamogeton are discussed in another paper (Berg, 1950). Similar data regarding eight acalyptrate species will be presented here. Parasitic Hymenoptera reared from puparia of Hydrellia in this investigation represent nine species, seven of which appear to be new. Publication of data on the biology of these interesting insects will be deferred until they are described and specific names become available.
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