Analysis of information sources in references of the Wikipedia article "Mayfly" in English language version.
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It has been advanced as an argument against the use of the wet fly, that duns and the other small insects which drift down upon the surface of a stream are never seen by the fish under water, and that a wet fly is therefore an unnatural object, especially if winged. "Never" is a big word, and I venture to think the case is overstated. I have watched an eddy with little swirling whirlpools in it for an hour together, and again and again I have seen little groups of flies caught in one or other of the whirls, sucked under and thrown scatterwise through the water.
Regional colloquialisms include fishflies, shadflies, and a slew of other names that aren't fit to print.