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Fall Caddisflies

Scientific Name
MatchScientific Name
**Dicosmoecus

This common name refers to only one genus.

Caddisfly Genus Dicosmoecus

These are sometimes called Fall Caddisflies.
This is a superhatch in the West. Gary LaFontaine had a self-proclaimed obsession with Dicosmoecus, and he devotes several pages of Caddisflies to stressing the importance of its larvae, pupae, and adults. He wrote:

The question for fly fishermen seeking big trout is: "Which insects provide the best opportunity for catching such fish?" My list would be: Giant Orange Sedge (Dicosmoecus sp.), Salmon Fly (Pteronarcys californica, a stonefly), and the Michigan Mayfly (Hexagenia limbata). Dicosmoecus is the most important -- and the contest is not even close.

His reasons for this judgement are five traits of Dicosmoecus:

  • Very large size: Adults 30mm long, and thick.

  • Activity concentrated within 2-3 weeks.

  • Emerges in the low, clear water of fall.

  • Active during afternoon and evening.

  • Abundant in rivers with sea-run trout.


I have never fished the West to experience Dicosmoecus, but I have enough experience with Hexagenia limbata to know that a greater insect must be truly amazing.
Dicosmoecus gilvipes (October Caddis) Caddisfly NymphDicosmoecus gilvipes (October Caddis) Caddisfly Nymph View 3 Pictures
Collected October 5, 2010 from in
Added to Troutnut.com by on June 27, 2011
Female Dicosmoecus atripes (October Caddis) Caddisfly AdultFemale Dicosmoecus atripes (October Caddis) Caddisfly Adult View 6 PicturesThis specimen is 26 mm.
- Entoman
Collected September 27, 2013 from in
Added to Troutnut.com by on September 29, 2013
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