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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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Taju has attached this picture to aid in identification. The message is below.
Hartola, Finland

Posts: 11
Taju on Nov 15, 2008November 15th, 2008, 7:46 am EST
I guess that this is Ptilostomis, according to the web-pages. But what is the species name (ocellifera??)?

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"Bear Swamp," PA

Posts: 1681
GONZO on Nov 15, 2008November 15th, 2008, 7:54 am EST
Certainly looks like Ptilostomis, but I'm not sure I know how to distinguish the species. Wait for Dave on that score.
Grants Pass, OR

Posts: 302
Creno on Nov 15, 2008November 15th, 2008, 8:14 am EST
While the photo is not as good as the previous (the wing venation/coloration is not in focus) I don't believe it is ocellifera as as my specimens of ocellifera are generally paler and with less wing coloration than the other two likely species (postica and semifasciata). I would not feel comfortable using just size and color to separate these species. I think you need to take a good look at the private parts to be sure.

There is an excellent source for this family:

Wiggins, G.B. 1998. The caddisfly family Phryganeidae (Trichoptera. University of Toronto Press. 306pp.
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Nov 15, 2008November 15th, 2008, 10:18 am EST

Ethan Bright's website gives keys for Ptilostomis to the species level (based on the Wiggins reference that Creno mentions):


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