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.

Stream photos

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Isoperla (Stripetails and Yellow Stones) Stonefly Adult Isoperla (Stripetails and Yellow Stones) Stonefly Adult

Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) Stonefly Adult from Mystery Creek #308 in Washington

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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 Species Cheumatopsyche pasella (Little Sister Sedges)

Where & when

Time of year : Early May

In 58 records from GBIF, adults of this species have mostly been collected during June (31%), May (19%), July (17%), August (16%), April (9%), and September (5%).

In 4 records from GBIF, this species has been collected at elevations of 112, 180, 730, and 3264 ft.

Species Range

source

Map of specific collection sites

Larva & pupa biology

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Start a Discussion of Cheumatopsyche pasella

References

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