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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 Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
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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Stonefly Genus Isoperla (Stripetails and Yellow Stones)

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.

Where & when

In 510 records from GBIF, adults of this genus have mostly been collected during May (33%), June (30%), April (17%), and July (14%).

In 335 records from GBIF, this genus has been collected at elevations ranging from 26 to 11430 ft, with an average (median) of 1909 ft.

Genus Range

Specimens of the Stonefly Genus Isoperla

5 Adults
3 Male Adults
1 Female Adult
8 Nymphs

Start a Discussion of Isoperla

References

Stonefly Genus Isoperla (Stripetails and Yellow Stones)

Taxonomy
34 species (Isoperla bellona, Isoperla conspicua, Isoperla cotta, Isoperla coushatta, Isoperla davisi, Isoperla decepta, Isoperla decolorata, Isoperla distincta, Isoperla emarginata, Isoperla extensa, Isoperla francesca, Isoperla frisoni, Isoperla grammatica, Isoperla gravitans, Isoperla irregularis, Isoperla jewetti, Isoperla katmaiensis, Isoperla lata, Isoperla longiseta, Isoperla major, Isoperla maxana, Isoperla mohri, Isoperla namata, Isoperla nana, Isoperla orata, Isoperla ouachita, Isoperla petersoni, Isoperla phalerata, Isoperla punctata, Isoperla richardsoni, Isoperla sagittata, Isoperla slossonae, Isoperla szczytkoi, and Isoperla transmarina) aren't included.
Genus Range
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