FOOD SOURCES FOR SPRING CREEKS (part 4)
Midge (Diptera) undergo a complete metamorphosis like caddis. Hence the term emerger, which we often use for mayfly hatch stage, may not be appropriate in the scientific and taxonomical senses.
However, for spring-creek anglers the term is commonly used. We mean:

1. Pupae that are ascending to and reaching almost the water surface
2. Midge adults that are leaving (or struggling to leave) their pupal shucks.