Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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Amphizoa Beetle Larva Amphizoa Beetle Larva

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington

This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).

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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