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This volume provides keys to the families, genera, and species of both aquatic and terrestrial Neuroptera, adopting the recent practice of including Megaloptera as a suborder of Neuroptera. The richly illustrated keys encompass adults of all genera and some larvae and pupae.§§This series is designed to provide books permitting entomologists in all special fields of biology to identify the specimens of aquatic insects they acquire in South America, and, if the species has not yet been described, to determine its family and usually also its genus, and to facilitate its description as a species new to science.§