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White Flies

Like most common names, "White Fly" can refer to more than one taxon. For more detail click through to the scientific names.

Mayfly Family Polymitarcyidae

These are pretty much always called White Flies.
This is the only family of burrowing mayflies, besides Ephemeridae, which is abundant in the United States. All the trout fly fishing action comes from the genus Ephoron, because the other two genera reside in warm waters in the South.

Read about Ephoron for more details.

Mayfly Species Ephoron album

These are pretty much always called White Flies.

Mayfly Species Ephoron leukon

These are pretty much always called White Flies.
See the main Ephoron page for details about this species, which is not known to differ in any important ways (besides location) from the other species.

On page 243 of Hatches II there is a passage from an 1802 speech before the American Philosophical Society in which this mayfly was introduced to science. It was the first mayfly species described in the United States, so it is ironic that it went unnoticed through so many of the early decades of our sport.
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