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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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Caddisfly Genus Helicopsyche (Speckled Peters)

See Helicopsyche borealis for details. It is the only important trout stream species in this genus.

Where & when

In 178 records from GBIF, adults of this genus have mostly been collected during June (23%), July (20%), August (15%), May (12%), September (9%), April (8%), and March (7%).

In 103 records from GBIF, this genus has been collected at elevations ranging from 195 to 10194 ft, with an average (median) of 3363 ft.

Genus Range

Specimens of the Caddisfly Genus Helicopsyche

1 Female Adult
1 Pupa

1 Underwater Picture of Helicopsyche Caddisflies:

Start a Discussion of Helicopsyche


  • LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.

Caddisfly Genus Helicopsyche (Speckled Peters)

Species in Helicopsyche
Helicopsyche borealis
Species in Helicopsyche: Helicopsyche borealis
8 species (Helicopsyche annulicornis, Helicopsyche arenifera, Helicopsyche limnella, Helicopsyche mexicana, Helicopsyche paralimnella, Helicopsyche piroa, Helicopsyche pupoidea, and Helicopsyche sinuata) aren't included.
Genus Range
Common Name
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