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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 Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen appears to be of the same species as this one collected in the same spot two months earlier. The identification of both is tentative. This one suffered some physical damage before being photographed, too, so the colors aren't totally natural. I was mostly photographing it to test out some new camera setting idea, which worked really well for a couple of closeups.
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 Species Strophopteryx fasciata (Mottled Willowflies)

Where & when

Time of year : Late March and early April

In 78 records from GBIF, adults of this species have mostly been collected during March (37%), February (28%), April (14%), and January (13%).

In 14 records from GBIF, this species has been collected at elevations ranging from 20 to 2723 ft, with an average (median) of 673 ft.

Species Range

Hatching behavior

Time of day : Midday

Specimens of the Stonefly Species Strophopteryx fasciata

2 Male Adults
2 Female Adults
1 Nymph

Start a Discussion of Strophopteryx fasciata


Stonefly Species Strophopteryx fasciata (Mottled Willowflies)

Species Range
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