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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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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Posts: 31
GoofusBug on May 15, 2009May 15th, 2009, 5:24 pm EDT
I am heading to west central Wisconsin in early June. What color scuds should I be tying up?
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Site Editor
Plano, TX

Posts: 1311
Taxon on May 16, 2009May 16th, 2009, 3:10 am EDT

That's a bit of a tricky question, as scuds are semi-transparent, and so appear the color of that on which they have been feeding, so it varies from one location to another. However, either olive or tan would likely be reasonable choices.
Best regards,
Roger Rohrbeck
St. Michael, Minnesota

Posts: 26
CharlieSawd on May 18, 2009May 18th, 2009, 7:52 am EDT
I fish the Kinni and Rush frequently.

I use three colors typically, orange, pink, and a "mint" or light green/gray pattern. There are olive and tan scuds present, but I have found the aforementioned colors to out-fish these.

See https://www.driftlessflybox.com/Scuds.html to see recipes for these patterns.

Skim through this site (www.driftlessflybox.com) to check out some other hatch and pattern info. Jason provided the photos of all the "naturals."

Let me know if you have anything else!

Charlie Sawdey
Wiflyfisher's profile picture

Posts: 622
Wiflyfisher on May 18, 2009May 18th, 2009, 12:31 pm EDT
I have a daughter who is going to attend UWRF this Fall. I have to take here to UWRF for placement tests in mid-June. I am hoping to get a chance to sneak out and spend a little time on the beautiful Kinni that I have heard a lot about while she is at school all day.
St. Michael, Minnesota

Posts: 26
CharlieSawd on May 18, 2009May 18th, 2009, 3:11 pm EDT
Way to take advantage of the situation. The best part is, you get credit with the wife for taking her!
Charlie Sawdey

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