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.

Looking across Island Lake toward the Titcomb Basin—one of the popular crown jewels of the Wind River Mountains

From Island Lake in Wyoming

Stream photos

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Male Baetidae (Blue-Winged Olive) Mayfly Dun Male Baetidae (Blue-Winged Olive) Mayfly Dun

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington

This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.

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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 Mesocapnia variabilis (Little Snowflies)

Species Range

source

Identification

Species ID from GBIFthe Global Biodiversity Information Facility

Source: The first records of Mesocapnia (Plecoptera: Capniidae) from China with description of a new species

Diagnosis and remarks. Mesocapnia variabilis males are macropterous (Fig. 3). The main epiproct sclerite has a distinct swollen bulb near mid-length, narrowing distally and slightly wider before gradually tapering to a point (Figs. 1 – 2, 14).

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