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.

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Perlodidae (Springflies and Yellow Stones) Stonefly Nymph Perlodidae (Springflies and Yellow Stones) Stonefly Nymph

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.

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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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Hexagenia bilineata?

149113 has attached these 7 pictures to aid in identification. The message is below.

149113
Pennsy

Posts: 3

149113 on Jul 21, 2016July 21st, 2016, 9:45 am EDT

Found these two around Middletown, PA last evening. Both spinners with one spent and one upright. Looking at the previous posts it would seem these are female? These measured 27mm. Previous post seem to indicate Hexagenia bilineata

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Jul 21, 2016July 21st, 2016, 9:42 pm EDT

Hi Bob-

Welcome aboard. Yes, I believe the first two photos to be Hexagenia bilineata female imagoes. I believe the others to be Hexagenia female subimagoes of undetermined species.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on Jul 22, 2016July 22nd, 2016, 7:48 am EDT

Yes sir. Like Roger said that's H bilineata. big girls! Thanks for posting.

Eric

149113
Pennsy

Posts: 3

149113 on Jul 22, 2016July 22nd, 2016, 8:44 am EDT

Thanks guys! I shot a few pics of one last evening and added those to the original post... couldn't figure out how to add them to a separate post. Looking at other ID's these seem like Hexagenia limbata but just wanted to confirm. This specimen measured 24.5mm and was a subimago. It was just hanging out near a light fixture with a lot of smaller mayflies

Jmd123

Oscoda, MI

Posts: 2474

Jmd123 on Jul 22, 2016July 22nd, 2016, 10:58 am EDT

I love anything Hexagenia. The guys who flyfish the Huron River for smallies downstate love this hatch, and this is when they show up, into August too. Didn't get enough of Hex mania in June? Well here's another chance...

Jonathon

No matter how big the one you just caught is, there's always a bigger one out there somewhere...

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on Jul 23, 2016July 23rd, 2016, 2:52 am EDT

Looking at other ID's these seem like Hexagenia limbata but just wanted to confirm. This specimen measured 24.5mm and was a subimago. It was just hanging out near a light fixture with a lot of smaller mayflies

I'd call that H. limbata. And I have collected them together with H. bilineata from the Susquehanna River.

149113
Pennsy

Posts: 3

149113 on Jul 23, 2016July 23rd, 2016, 9:09 am EDT

Looking at other ID's these seem like Hexagenia limbata but just wanted to confirm. This specimen measured 24.5mm and was a subimago. It was just hanging out near a light fixture with a lot of smaller mayflies

I'd call that H. limbata. And I have collected them together with H. bilineata from the Susquehanna River.

Thanks! I saw some of the white flies last evening down by the park on the river. Considerably smaller than these hex mayflies but there were a lot of them