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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 Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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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Mayfly Species Ameletus suffusus (Brown Duns)

Where & when

In 10 records from GBIF, adults of this species have been collected during June (50%), April (20%), July (10%), March (10%), and May (10%).

In 1 record from GBIF, this species has been collected at elevation of 3500 ft.

Species Range

Specimens of the Mayfly Species Ameletus suffusus

1 Nymph

Start a Discussion of Ameletus suffusus

Mayfly Species Ameletus suffusus (Brown Duns)

Taxonomy
Species Range
Common Name
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