Hydraenidae is a family of very small aquatic beetles with a worldwide distribution. These beetles are generally 1-3 mm in length (although some species reach 7 mm) with clubbed antennae. They do not swim well and are generally found crawling in marginal vegetation. Most are phytophagous but a few saprophagous and predatory species are known. The ...
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http://en.wikipedia.org/wiki/Hydraenidae
Hydraenidae is a family of five genera of beetles ranging from one to seven millimetres in length, and living in or near water.
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http://www.probertencyclopaedia.com/browse/BH.HTM
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