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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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 Family Thremmatidae

This caddisfly family is important in the fall. Neophylax may be important nationwide, but Oligophlebodes is only known to provide fishable action in the West.

Where & when

In 189 records from GBIF, adults of this family have mostly been collected during October (34%), September (23%), August (15%), July (12%), and June (9%).

In 136 records from GBIF, this family has been collected at elevations ranging from 30 to 11191 ft, with an average (median) of 1880 ft.

Family Range

Specimens of the Caddisfly Family Thremmatidae

1 Female Adult
3 Larvae

2 Underwater Pictures of Thremmatidae Caddisflies:

Start a Discussion of Thremmatidae

Caddisfly Family Thremmatidae

Family Range
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