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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Common Names of Trout Stream Insects

Common Names of Trout Stream Insects

Common names are more confusing than Latin names, because there are usually many names for each bug and many bugs for each name. People like them anyway. Most of these names are better for talking about body colors (like Sulphur) or fly patterns (like Adams) than for discussing actual insect species. A common name might tell you roughly what an insect looks like. A few of them can tell you what species you're dealing with, especially if you're familiar with your area's hatches and what people call them. However, many common names aren't even common—they were just made up by authors trying to name a species for readers they imagine are deathly allergic to Latin, as if "pale white-winged watery dun" is really any more common in streamside conversations than Anafroptilum.

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