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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 Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
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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Caddisfly Species Dicosmoecus atripes (October Caddisflies)

This species was originally very important on its own, but now another important former species, Dicosmoecus jucundus, is considered a synonym of atripes. This extends its range and amplifies its value.

Where & when

Time of year : September and October

This species known to be important in California, Utah, originally, and in Montana and Alaska with the new synonym.

In 41 records from GBIF, adults of this species have mostly been collected during August (44%), September (32%), October (12%), and July (7%).

In 37 records from GBIF, this species has been collected at elevations ranging from 1982 to 20669 ft, with an average (median) of 8668 ft.

Species Range

Specimens of the Caddisfly Species Dicosmoecus atripes

1 Female Adult

Start a Discussion of Dicosmoecus atripes

References

Caddisfly Species Dicosmoecus atripes (October Caddisflies)

Taxonomy
Species Range
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