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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.

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 Nymphs, Couplet 2

Identification: Key to Species of Agnetina Nymphs, Couplet 2

Adapted from Stark et al (1986)
Option 1Option 2
Arms of light-colored M-shaped line on head directed essentially laterally Arms of light-colored M-shaped line on head directed posterolaterally
Dark pigment of tergum 10 continuous
Nymphal tergum 10 of Agnetina capitata.
Nymphal tergum 10 of Agnetina capitata. Figure source: Stark et al (1986)
Dark pigment of tergum 10 interrupted mesally
Nymphal tergum 10 of Agnetina flavescens.
Nymphal tergum 10 of Agnetina flavescens. Figure source: Stark et al (1986)
2 Example Specimens
1 Example Specimen
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.
Leads to Agnetina annulipes:
  • Apex of tergum 10 dark
Leads to Couplet 2:
  • Apex of tergum 10 light
Couplet 2
Couplet 2

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Couplet 2 (You are here)
Leads to Agnetina capitata:
  • Arms of light-colored M-shaped line on head directed essentially laterally
  • Dark pigment of tergum 10 continuous
Leads to Agnetina flavescens:
  • Arms of light-colored M-shaped line on head directed posterolaterally
  • Dark pigment of tergum 10 interrupted mesally

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References

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