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.
This prolific genus is most important in lakes, spring ponds, and beaver ponds, but some of its species do well enough in spring creeks and slow pools to be important to trout there.
Where & when
Time of year : Late spring through fall
Preferred waters: Mostly stillwater; some species inhabit slow streams
Most of these species emerge in late spring or early summer, but the adults are not mature (sort of like mayfly duns, except they don't need to molt again). They mature over the summer and mate in the fall.
According to Swisher and Richards in Selective Trout, some Limnephilus species are multibrooded, with one spring generation and one fall generation. This seems very strange for a large caddisfly, and I wonder if they mistook the spring emergence and fall egg-laying for different broods.
Egg-Laying behavior
LaFontaine writes in Caddisflies that they lay their eggs "near the water."
Larva & pupa biology
Shelter type: Thick tubes of stone, sand, bark, or wood
This caddis is one of the most abundant caddisflies in temporary ponds of Glacier Park. The larvae build a round case of detritus and dead plant material that can get quite large.
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References
LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.
Schwiebert, Ernest G. 1955. Matching the Hatch. MacMillan Publishing Company.
Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.