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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This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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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 1 | Option 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 
| Dark pigment of tergum 10 interrupted mesally 
|
2 Example Specimens | 1 Example Specimen
I took a few closeup pictures of this stonely with my old camera and a microscope.
|
| 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 (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
Start a Discussion of this Couplet
References
- Stark, B.P. 1986. The Nearctic Species of Agnetina (Plecoptera: Perlidae). Journal of the Kansas Entomological Society 59(3): 437-445.