Hex Mayflies
Hexagenia limbata
The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
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With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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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.
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.
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.
References
- Caucci, Al and Nastasi, Bob. 2004. Hatches II. The Lyons Press.