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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 Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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 Neoperla (Golden Stones)

Where & when

In 44 records from GBIF, adults of this genus have mostly been collected during June (55%), July (20%), and August (20%).

In 4 records from GBIF, this genus has been collected at elevations of 2625, 4183, 5085, and 7349 ft.

Genus Range


To determine whether a specimen of Perlidae belongs to Neoperla, use the Key to Genera of Perlidae Nymphs.

Start a Discussion of Neoperla

Stonefly Genus Neoperla (Golden Stones)

Species in Neoperla: Neoperla coosa, Neoperla stewarti
13 species (Neoperla carlsoni, Neoperla catharae, Neoperla choctaw, Neoperla clymene, Neoperla coxi, Neoperla falayah, Neoperla gaufini, Neoperla harpi, Neoperla harrisi, Neoperla mainensis, Neoperla occipitalis, Neoperla osage, and Neoperla robisoni) aren't included.
Genus Range
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