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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 Family Lepidostomatidae (Little Brown Sedges)

See Lepidostoma for details. It's the only important genus in this family.

The other one, Theliopsyche, is an uncommon Eastern small stream genus.

Where & when

In 563 records from GBIF, adults of this family have mostly been collected during July (26%), August (23%), June (23%), May (11%), and September (9%).

In 214 records from GBIF, this family has been collected at elevations ranging from 7 to 19701 ft, with an average (median) of 4304 ft.

Family Range

Specimens of the Caddisfly Family Lepidostomatidae

3 Male Adults
2 Female Adults
5 Larvae

Start a Discussion of Lepidostomatidae


Caddisfly Family Lepidostomatidae (Little Brown Sedges)

Genus in Lepidostomatidae: Lepidostoma, Theliopsyche
Family Range
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