THE EASTERN NORTH AMERICAN SPECIES OF THE GENUS EPHEMERELLA AND THEIR NYMPHS (EPHEMEROPTERA)

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Abstract
This species, described from a single rather imperfect male specimen, was found very abundantly in certain sections of the Knowlton, Que. region in 1929 and 1930, the adults swarming at dusk and mating on warm evenings in the latter half of June. The very striking nymph was also secured in the small brooks of the Bolton Pass section, four or five miles south of Knowlton. The following notes on the species are offered to supplement the original description.

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