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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.

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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Stonefly Genus Hesperoperla (Golden Stones)

The important western genus Hesperoperla currently has only two species. See the species hatch pages for details.

Where & when

In 44 records from GBIF, adults of this genus have mostly been collected during July (34%), June (25%), May (20%), and April (9%).

In 16 records from GBIF, this genus has been collected at elevations ranging from 1969 to 8632 ft, with an average (median) of 6339 ft.

Genus Range


To determine whether a specimen of Perlidae belongs to Hesperoperla, use the Key to Genera of Perlidae Nymphs.

Specimens of the Stonefly Genus Hesperoperla

1 Male Adult
4 Female Adults
4 Nymphs

Start a Discussion of Hesperoperla


Stonefly Genus Hesperoperla (Golden Stones)

Species in Hesperoperla
Hesperoperla pacificaWillowflies
Species in Hesperoperla: Hesperoperla pacifica
1 species (Hesperoperla hoquei) isn't included.
Genus Range
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