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.

Stream photos

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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

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.

8 Recently Added Photos

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

source

Map of specific collection sites

Specimens of the Stonefly Genus Capnia

1 Adult

Capnia nana (Little Snowfly) Stonefly Adult

2 Pictures

Capnia nana (Capniidae) (Little Snowfly) Stonefly Adult from the N. Fork Touchet River in Washington

Collected March 6, 2012 from the N. Fork Touchet River in Washington

Added by Bnewell on March 20, 2012

Collected March 6, 2012 from the N. Fork Touchet River in Washington and added by Bnewell on March 20, 2012

Start a Discussion of Capnia

References

Schwiebert, Ernest G. 1955. Matching the Hatch. MacMillan Publishing Company.