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.

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From the Selawik River in Alaska

Stream photos

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Doroneuria baumanni (Golden Stone) Stonefly Nymph Doroneuria baumanni (Golden Stone) Stonefly Nymph

Dorsal view of a Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Nymph from Sears Creek in Washington

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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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Identification: Key to Species of Agnetina Adults, Couplet 2

Couplet 2
Full Key at a Glance

Adapted from Stark et al (1986)

Option 1	Option 2
Ventral margin of femora dark forming mesal yellow window Anterior view of femur of Agnetina capitata. Figure source: Stark et al (1986)	Ventral margin of femora light Anterior view of femur of Agnetina flavescens. Figure source: Stark et al (1986)
Apical portion of male hemitergal process long and sinuate, toe bluntly rounded Lateral view of hemitergal process of male Agnetina capitata. Figure source: Stark et al (1986)	Swollen area of male hemitergal process adjacent to foot obscuring ankle area Lateral view of hemitergal process of male Agnetina flavescens. Figure source: Stark et al (1986)
Dark pirgment areas on female sterna 8 and 9 large quadrangular Sterna 8 and 9 of female Agnetina capitata. Figure source: Stark et al (1986)	Dark pigment areas of female sterna 8 and 9 not quadrangular Sterna 8 and 9 of female Agnetina flavescens. Figure source: Stark et al (1986)

source	source
2 Example Specimens Male Agnetina capitata (Golden Stone) Stonefly Adult Male Agnetina capitata (Golden Stone) Stonefly Adult 11 Pictures Male Agnetina capitata (Golden Stone) Stonefly Adult Male Agnetina capitata (Golden Stone) Stonefly Adult This stonefly emerged in my aquarium, and unfortunately I severely damaged its wings just trying to catch it. It's still an interesting specimen, especially since I was able to also photograph the nymphal shuck it emerged from. I was surprised by just how light it was shortly after emerging. I photographed it a couple days later when it had darkened considerably; it was a pale, almost pastel yellow at first. 9 Pictures
Agnetina capitata	Agnetina flavescens

Adapted from Stark et al (1986)

The current couplet is highlighted with darker colors and a icon, and couplets leading to this point have a icon.

Couplet 1

Leads to Agnetina annulipes:

Femora transversely banded
Male hemitergal process foot-shaped with long slender ankle and toe
Female subgenital plate truncate, dark pigment covers sternum 8 in continuous mesal band

Agnetina annulipes

Leads to Couplet 2: