Scientific name search:

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. Read more...

There are 2 more specimens...