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.
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This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
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Yellow Sallflies
This common name refers to only one species. Click its scientific name to learn more.
Stonefly Species Suwallia pallidula
These are sometimes called Yellow Sallflies.
This species keeps turning up when I collect little yellow stoneflies throughout midsummer in Washington and Montana. I suspect it is one of the most ubiquitous of the Chloroperlidae "yellow sallies."
This specimen keys out to Suwallia, for which I did not find any nymph species keys. However, I'm placing it in Suwallia pallidula because I caught a few adults in the same spot that closely resembled the abundant nymphs and keyed them out to species. Features I noted under the microscope when keying this specimen to genus included apical hairs of cercal segments that were directed at posterior angles, and the longest apical hairs of distal segments were shorter than their following segment.
See 3 more specimens...