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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This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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Editorials about Fly Fishing Issues
Editorials about Fly Fishing Issues
In Defense of "Latin" Names
There is a rising chorus of curmudgeons who decry the use of Latin names for bugs, ridiculing the vocabulary contests we hold around the fireplace of their imaginations. In reality we use scientific names because they're the less confusing way to swap practical advice about the details of each hatch.