"Adult midges emerge by pulling themselves out of their pupal shuck and breaking through the surface film.
As they emerge, the adult midge appears to be twice as long as the pupa because the trailing shuck is attached to the adult’s body.
Close observation of emergence leads me to believe that as the adult struggles to free themselves from the pupal sheath, trout key heavily on this phase of development. Pat’s Midge was designed to imitate these midges with trailing shucks.
Pat’s Midge is equally effective when it comes to mimicking midges that never complete the emerging process. These ill-fated midges are known as cripples or stuck in the shuck midges."
- Signature Tyer Pat Dorsey