There's a large Ephemerella subvaria nymph in the top left.  In this picture: Insect Order Trichoptera (Caddisflies), Mayfly Species Ephemerella invaria (Sulphur Dun), and Mayfly Species Ephemerella subvaria (Hendrickson). From the Namekagon River in Wisconsin.
See many more fly fishing, trout stream, and stream insect pictures on the Troutnut.com homepage and discussion forum.

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There's a large Ephemerella subvaria nymph in the top left.
In this picture: Insect Order Trichoptera (Caddisflies), Mayfly Species Ephemerella invaria (Sulphur Dun), and Mayfly Species Ephemerella subvaria (Hendrickson).

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Troutnut.com is a collection of pictures and information about fly fishing. Fly fishermen, fly tiers, and trout enthusiasts of all stripes can learn more about life beneath the surface of trout streams, as well as how to better imitate aquatic insects with artificial flies to catch trout. There are aquatic insect pictures, underwater pictures, landscape pictures, and a comprehensive reference to the common names of trout stream insects.