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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.

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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 Capnia (Little Snowflies)

This is one of the most common genera of Capniidae.

Where & when

In 47 records from GBIF, adults of this genus have mostly been collected during April (34%), March (21%), May (15%), February (13%), and June (11%).

In 8 records from GBIF, this genus has been collected at elevations ranging from 220 to 8648 ft, with an average (median) of 5338 ft.

Genus Range

Specimens of the Stonefly Genus Capnia

1 Adult

Start a Discussion of Capnia


Stonefly Genus Capnia (Little Snowflies)

33 species (Capnia californica, Capnia cheama, Capnia coloradensis, Capnia confusa, Capnia elongata, Capnia erecta, Capnia excavata, Capnia fialai, Capnia giulianii, Capnia glabra, Capnia hitchcocki, Capnia jewetti, Capnia lacustra, Capnia licina, Capnia lineata, Capnia mariposa, Capnia melia, Capnia nearctica, Capnia ophiona, Capnia oregona, Capnia petila, Capnia promota, Capnia quadrituberosa, Capnia regilla, Capnia saratoga, Capnia scobina, Capnia sextuberculata, Capnia spinulosa, Capnia uintahi, Capnia valhalla, Capnia vernalis, Capnia willametta, and Capnia zukeli) aren't included.
Genus Range
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