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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.

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.
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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Little Snowflies

Like most common names,"Little Snowfly" can refer to more than one taxon. They're previewed below, along with 5 specimens. For more detail click through to the scientific names.

Stonefly Family Capniidae

These are often called Little Snowflies.
These are the first stoneflies of the year to appear in most parts of the country, and often the first aquatic insects noticed by the angler. Their dark brown or black bodies are easy to spot against the snowbanks where they crawl around.

Capnia in the West and Allocapnia in the East are probably the most common genera of this prolific family.
Capnia nana (Capniidae) (Little Snowfly) Stonefly Adult from the N. Fork Touchet River in Washington
Dorsal view of a Capniidae (Snowfly) Stonefly Nymph from Cascadilla Creek in New York

Stonefly Genus Allocapnia

These are often called Little Snowflies.
Allocapnia granulata is the most abundant Capniidae species in the East.

Stonefly Genus Capnia

These are often called Little Snowflies.
This is one of the most common genera of Capniidae.
Capnia nana (Capniidae) (Little Snowfly) Stonefly Adult from the N. Fork Touchet River in Washington

Stonefly Genus Isocapnia

These are often called Little Snowflies.
Female Isocapnia hyalita (Capniidae) (Little Snowfly) Stonefly Adult from the  Touchet River in Washington
Isocapnia integra (Capniidae) (Little Snowfly) Stonefly Nymph from the Flathead River-upper in Montana

Stonefly Genus Utacapnia

These are often called Little Snowflies.

Stonefly Species Utacapnia distincta

These are often called Little Snowflies.

Stonefly Species Capnia gracilaria

These are often called Little Snowflies.

Stonefly Species Allocapnia granulata

These are often called Little Snowflies.

Stonefly Species Isocapnia integra

These are often called Little Snowflies.
Isocapnia integra (Capniidae) (Little Snowfly) Stonefly Nymph from the Flathead River-upper in Montana
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