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

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

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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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Adirman
Adirman's profile picture
Monticello, NY

Posts: 479
Adirman on Jun 14, 2016June 14th, 2016, 5:00 am EDT
Hey Guys, I was fishing last evening on the Willow and noticed the usual stuff that been around lately, a mix of caddis, Slate Drake, Sulfurs, etc. but then i started seeing a few quite large Mayflys float past me. I picked one up to get a good look, it was around a size 10, VERY white, wings looked pretty white too, sorry I dont have a pic, maybe I can get one in a day or 2, any thoughts based on time of year and limited description I provided? Im thinking its a Light Cahill of the Species Macaffertium Ithaca

Thanks,

Adirman
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on Jun 14, 2016June 14th, 2016, 6:24 am EDT
Adirman,

Could be Maccaffertium ithaca, also could be Maccaffertium terminatum or Epheron leukon. Also probably others I missed.

Here are some links:

Maccaffertium terminatum - http://www.troutnut.com/hatch/600/Mayfly-Maccaffertium-terminatum

Epheron leukon - http://bugguide.net/node/view/316968/bgimage
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
Adirman
Adirman's profile picture
Monticello, NY

Posts: 479
Adirman on Jun 16, 2016June 16th, 2016, 7:37 pm EDT
Not Ephoron leukon, too different, either Terminatum or Ithaca I think, was definitely a good sized Mayfly, i thought a 10 when I observed it
PagansMind
PagansMind's profile picture
Pennsylvania

Posts: 2
PagansMind on Jun 22, 2016June 22nd, 2016, 9:22 pm EDT
Light cahills were hatching last week in PA, so it is likely that you are correct. A big one might be a 12.

http://www.djlflyfishers.org/hatches.htm

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