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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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Caddisfly Genus Oligophlebodes (Little Western Dark Sedges)

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Where & when

Time of year : August and September

All Oligophlebodes species of significance to fly fishermen occur in the West.

They also occur, but not in significant numbers, in the Midwest.

In 39 records from GBIF, adults of this genus have been collected during August (44%), July (28%), June (13%), September (8%), and May (8%).

In 13 records from GBIF, this genus has been collected at elevations ranging from 2733 to 11191 ft, with an average (median) of 6250 ft.

Genus Range

Hatching behavior

Time of day : Midday

Egg-Laying behavior

Time of day: Late afternoon

Females of this genus fall to the surface to lay their eggs.

Larva & pupa biology

Shelter type: Stone

The cased larvae exhibit heavy behavioral drift near midday for a couple months before emerging.

Start a Discussion of Oligophlebodes

References

Caddisfly Genus Oligophlebodes (Little Western Dark Sedges)

Taxonomy
4 species (Oligophlebodes ardis, Oligophlebodes mostbento, Oligophlebodes ruthae, and Oligophlebodes zelti) aren't included.
Genus Range
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