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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.

Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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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Btbo32 has attached this picture to aid in identification. The message is below.
Btbo32
Posts: 13
Btbo32 on Jun 9, 2019June 9th, 2019, 1:21 pm EDT
Hi All- found this bug on my car today after a very productive day out on the Big Flatbrook River in Northwestern NJ. Picture not as focused as I’d like but I’m hoping someone can help me Identify this Mayfly??
Thanks
Jersey Boy
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Jun 9, 2019June 9th, 2019, 4:19 pm EDT
Hi Jersey Boy-

Focus of photo notwithstanding, I believe this male imago to likely be Maccaffertium ithaca.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Btbo32
Posts: 13
Btbo32 on Jun 10, 2019June 10th, 2019, 1:54 am EDT
Thank you Roger!
Jersey Boy

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