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Photographs and a description of this predatory gall midge, its distribution, life cycle and use as a biological control of the twospotted spider mite.
Illustration and description of the Hessian Fly, its biology, distribution within the former USSR, ecology and economic significance as an insect pest of cereal crops.
Information from Wikipedia on this family of flies, commonly known as gall midges or gall gnats. Although tiny, many are economically significant pests of crops.