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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.

Paraleptophlebia bicornuta (Large Slate-Winged Mahogany Dun) Mayfly Nymph Pictures

This species is interesting because it is common in lakes as well as streams. It is one of the last species of the year to emerge in western Montana. Adults have been collected as late as October 15 weather permitting.

This mayfly was collected from Flathead Lake in Montana on July 31st, 2007 and added to Troutnut.com by Bnewell on June 26th, 2011.

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