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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.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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 Genus Neoleptophlebia

This genus was created somewhat recently from species, including some important to anglers, that were formerly grouped in Paraleptophlebia.

Where & when

In 39 records from GBIF, adults of this genus have been collected during June (54%), July (15%), April (13%), May (13%), and August (5%).

In 18 records from GBIF, this genus has been collected at elevations ranging from 3 to 10387 ft, with an average (median) of 6565 ft.

Genus Range

Specimens of the Mayfly Genus Neoleptophlebia

3 Male Duns
2 Female Duns
8 Male Spinners
12 Nymphs

1 Streamside Picture of Neoleptophlebia Mayflies:

Start a Discussion of Neoleptophlebia


Mayfly Genus Neoleptophlebia

Genus Range
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