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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.

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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Perlidae stonefly nymph. A large predator of clean freshwater streams

Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Fall Creek in New York
GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Oct 10, 2006October 10th, 2006, 2:08 pm EDT
I've been staring at this one for quite some time. My first impression was lycorias (Boreal Stone, Giant Brown Stonefly). I'm pretty familiar with this species, but I don't know of a good key to Acroneuria at the species level.

The lack of a row of spinules along the occiput of the head and presence of postocular and pronotal fringes all say Acroneuria for sure.
GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Oct 28, 2008October 28th, 2008, 6:34 am EDT
Jason, I now think that this is probably abnormis rather than lycorias.

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