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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.

Dorsal view of a Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
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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Roseville, CA

Posts: 8
GaryO on Jun 30, 2015June 30th, 2015, 9:50 am EDT
Any of you folks use one of these? Thanks...
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Jun 30, 2015June 30th, 2015, 5:01 pm EDT
Use what? a lanyard? In Montana many of the guides use them instead of a vest. One little fly box, clippers, forceps, dry fly gunk, tippet spools, what else do you need?
Catskill fly fisher for fifty-five years.

Posts: 2
Bigskydrift on Nov 4, 2015November 4th, 2015, 9:11 pm EST
ya cool! I live in western Montana and don't have one, but it is on my hit list !
“I’m in love with Montana. For other states I have admiration, respect, recognition, even some affection. But with Montana it is love. And it’s difficult to analyze love when you’re in it.”

John Steinbeck,
Roguerat's profile picture
Posts: 456
Roguerat on Nov 5, 2015November 5th, 2015, 3:35 am EST
I've got a Dr Slick lanyard I wear when it's too hot to wear a vest...just make sure I've got what I really need on the lanyard or packed in a shirt pocket, saves time sloshing back to shore- then to the truck- to my vest to get what I forgot. They come in handy under the right conditions, IMHO.


'Less is more...'

Ludwig Mies Vande Rohe

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