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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this 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 Hydropsyche californica (Spotted Sedges)

Hydropsyche californica together with Hydropsyche occidentalis (both commonly referred to as Spotted Sedge or Spotted Caddis) are the most important Hydropsychidae in the West. It can also be stated that they are arguably the most important western hatches of any kind, at least to the trout if not anglers. On freestone rivers and streams their numbers can be truly astounding. This is especially so on tailwaters.

Where & when

Time of year : Highly variable; can be found on the water from early spring to early fall, depending on location

Distributed throughout the West, but their concentrations are highest in the West Coast states.

In 51 records from GBIF, adults of this species have mostly been collected during July (27%), August (22%), June (18%), September (10%), May (8%), and April (8%).

In 3 records from GBIF, this species has been collected at elevations of 4600, 6000, and 13671 ft.

Species Range

Specimens of the Caddisfly Species Hydropsyche californica

1 Larva

Start a Discussion of Hydropsyche californica


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

Caddisfly Species Hydropsyche californica (Spotted Sedges)

Species Range
Common Name
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