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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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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 Genus Platycentropus (Chocolate and Cream Sedges)

See Platycentropus radiatus for details. It is the only species of this genus which is known to be important.

Where & when

In 132 records from GBIF, adults of this genus have mostly been collected during July (28%), June (26%), August (20%), October (8%), and September (6%).

In 36 records from GBIF, this genus has been collected at elevations ranging from 10 to 16404 ft, with an average (median) of 1125 ft.

Genus Range

Specimens of the Caddisfly Genus Platycentropus

1 Larva

Discussions of Platycentropus


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References

Caddisfly Genus Platycentropus (Chocolate and Cream Sedges)

Taxonomy
Species in Platycentropus: Platycentropus radiatus
4 species (Platycentropus amicus, Platycentropus fraternus, Platycentropus indistinctus, and Platycentropus vittatus) aren't included.
Genus Range
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