ephemeridae

The trout will only heed an artificial fly that is dropped in front of them with upstanding wings, and in form of body and appendages, as in the manner of its progress on the surface of the stream, this counterfeit presentment must strictly imitate the small ephemeridae which are hatching in the bed and floating down the surface of the stream.

Lines in Pleasant Places Being the Aftermath of an Old Angler William Senior

But the vast clouds of winged _ephemeridae_ that dance over its waters when there is a rise of "May-fly" in early summer look to be not only the creatures of a day, but of our day.

The Naturalist on the Thames 1882

When catching the ephemeridae that play above the water, the tail is not expanded: it is reserved for times of courtship.

The Naturalist in Nicaragua Thomas Belt 1855

a little day (ephemeridae was the word she used) may live happy from the cradle to the grave.

Ayesha, the Return of She Henry Rider Haggard 1890