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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.

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
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 Psilotreta labida (Dark Blue Sedges)

See the Psilotreta genus page for more details that this important species shares with others in its genus.

Where & when

Time of year : Late April through June

This species is found up and down the eastern mountains. The hatch starts in late April in Virginia and finishes in northern New England in late June. It peaks in June in the Catskills, where it is especially well-known.

In 7 records from GBIF, adults of this species have been collected during June (57%) and May (43%).

Species Range

Hatching behavior

Time of day : Evening

Egg-Laying behavior

Time of day: Evening

Specimens of the Caddisfly Species Psilotreta labida

1 Male Adult
1 Larva

Start a Discussion of Psilotreta labida


Caddisfly Species Psilotreta labida (Dark Blue Sedges)

Species Range
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