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So widely spread is this insect at present, that we have even detected it in August on the summit of Mount Washington. The Diptera, or two-winged flies, contain hosts of noxious insects, such as the various Cecidomyians, or two-winged Gall flies, which now sting the culms of the wheat and grasses, and various grains, and leaves of trees, producing gall-like excrescences of varying form.
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