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.

Stream photos

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Ontario Sallfly

Sweltsa onkos Stonefly Adult

8 Pictures

Collected May 15, 2007 from Mystery Creek #62 in New York

Added by Troutnut on May 18, 2007

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Sep 9, 2008September 9th, 2008, 7:36 pm

I believe this is probably Sweltsa onkos. There are three Sweltsa species commonly listed for most of the Northeast (onkos, naica, and lateralis), and their individual pronotum/head markings seem rather distinctive.