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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.

Lone tree on a rock in the middle of Big Lake. Fittingly, Big Lake is the largest of several short wide spots in the upper Brule River. From the Bois Brule River in Wisconsin

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Sweltsa (Sallfly) Stonefly NymphSweltsa (Sallfly) Stonefly Nymph
Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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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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  3. Site updates from December 19, 2009

Closeup insects by Bnewell from 6 Mile Creek and the Flathead River in Montana

Drunella spinifera (Western Slate Olive Dun) Mayfly Nymph
3 Pictures
Drunella spinifera (Ephemerellidae) (Western Slate Olive Dun) Mayfly Nymph from 6 mile Creek in Montana
This species resembles Drunella grandis but the spines tell the story.
Added by Bnewell on June 26, 2011
Collected December 18, 2009 from 6 mile Creek in Montana and added by Bnewell on June 26, 2011
Isocapnia integra (Little Snowfly) Stonefly Nymph
1 Picture
Isocapnia integra (Capniidae) (Little Snowfly) Stonefly Nymph from the Flathead River-upper in Montana
Added by Bnewell on June 26, 2011
Collected December 18, 2009 from the Flathead River-upper in Montana and added by Bnewell on June 26, 2011

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