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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.

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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Tricos

This common name refers to only one family. Click its scientific name to learn more.

Mayfly Family Leptohyphidae

These are often called Tricos.
Read about the Tricorythodes genus for details. It is very important to trout anglers and it's the only significant trout stream genus in this family.

Most of the other genera are found only in warm waters in Mexico and the Southwest.
Dorsal view of a Male Tricorythodes (Leptohyphidae) (Trico) Mayfly Dun from Mystery Creek #304 in Idaho
Lateral view of a Female Tricorythodes (Leptohyphidae) (Trico) Mayfly Spinner from the Bitterroot River in Montana
This female Trico was collected with an associated male and many others.
Tricorythodes (Leptohyphidae) (Trico) Mayfly Nymph from Willow Creek in Oregon

Tricos

Scientific Name
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