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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.

Female Acentrella (Tiny Blue-Winged Olives) Mayfly Dun Pictures

I've lost the date information for this specimen and taken a guess.

This mayfly was collected from unknown in Wisconsin on August 1st, 2004 and added to Troutnut.com by Troutnut on January 25th, 2006.

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