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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

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.

Lateral view of a Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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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Mayfly Genus Leucrocuta

The species of this genus are relatively unimportant, but Leucrocuta hebe and Leucrocuta aphrodite may produce fishable hatches. They have the same general biology as Heptagenia.

Where & when

In 246 records from GBIF, adults of this genus have mostly been collected during June (35%), July (32%), August (21%), and May (7%).

In 67 records from GBIF, this genus has been collected at elevations ranging from 3 to 6332 ft, with an average (median) of 2362 ft.

Genus Range

Specimens of the Mayfly Genus Leucrocuta

3 Female Duns
2 Male Spinners
2 Female Spinners
4 Nymphs

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Mayfly Genus Leucrocuta

Genus Range
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