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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Little Yellow Stoneflies
Like most common names,"Little Yellow Stonefly" can refer to more than one taxon. They're previewed below, along with 5 specimens. For more detail click through to the scientific names.
Stonefly Species Isoperla quinquepunctata
These are pretty much always called Little Yellow Stoneflies.
This species is often the most common Perlodidae or Little Yellow Stone In Northern California, especially in mid-elevation rivers and streams.
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Stonefly Genus Isoperla
These are often called Little Yellow Stoneflies.
This is a very common trout stream stonefly genus. It is also huge, with sixty species scattered over the entire continent. Though anglers usually call them Little Yellow Stones or Yellow Sallies, the scientific common name for this genus is Stripetail. The latter is probably better to use as not all of them are necessarily little or yellow.
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Stonefly Species Alloperla caudata
These are often called Little Yellow Stoneflies.
Stonefly Species Sweltsa coloradensis
These are often called Little Yellow Stoneflies.
Stonefly Species Suwallia pallidula
These are often called Little Yellow Stoneflies.
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.
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