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The wings of the insect, which are of an iron gray, are covered with a down of fine hairs. The posterior ones soon disappear. Perhaps the subimago in this genus of Ephemerids, as in certain others, is the permanent aerial state of the female. La Nature. Connecticut is rapidly advancing in the cultivation of oysters.
One character, which is unique among insects, is peculiar to Ephemerids; the adults issuing from the pupal envelope undergo still another moult in divesting themselves of a thin pellicle that covers the body, wings, and other appendages. This is what is called the subimago, and precedes the imago or perfect state of the insect.
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