Salmonflies
Pteronarcys californica
The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
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Inchworms
This common name refers to only one family. Click its scientific name to learn more.
Moth Family Geometridae
These are pretty much always called Inchworms.
These terrestrial moths are sometimes taken by trout when their larvae, the well-known inchworms, dangle by their little silken threads in especially high numbers around June. They may be abundant enough throughout the forest that plenty dangle their way into the water.
I caught this inchworm lowering itself to the surface of a trout stream from its silk thread. I saw a couple others floating on the surface, so it's likely the trout were familiar with them.