collection of regional taxonomic keys, it covers the aquatic and semiaquatic life stages of insects as well as freshwater crustaceans, mites, mollusks, oligochaetes, and leeches. Each chapter begins with a brief natural history of the taxon and a discussion of collection and preservation techniques. Following is a checklist of the families and genera, or in the noninsect chapters higher taxa, of the animals included in the key. Most of the chapter is devoted to the key: a series of concise couplets, well illustrated with many diagnostic drawings. Annotation copyright Book News, Inc. Portland, Or.

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