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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 Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington
This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
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 gilvipes (October Caddisflies)

Where & when

Time of year : September and October

Preferred waters: Medium to large streams

According to LaFontaine in Caddisflies, this is the main species of Dicosmoecus in Idaho, Oregon, Washington, and British Columbia.

In 24 records from GBIF, adults of this species have mostly been collected during October (50%), September (38%), and November (8%).

In 6 records from GBIF, this species has been collected at elevations ranging from 16 to 3465 ft, with an average (median) of 755 ft.

Species Range

Specimens of the Caddisfly Species Dicosmoecus gilvipes

1 Female Adult
2 Adults

1 Underwater Picture of Dicosmoecus gilvipes Caddisflies:

Start a Discussion of Dicosmoecus gilvipes


Caddisfly Species Dicosmoecus gilvipes (October Caddisflies)

Species Range
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