These little guys show up around December 15th. Many anglers confuse them with midges because they have have atrophied tails. They are 5cm long, They have a black abdomen 1cm thick. The thorax is 2cm thick, it’s black.
The light blue dun wing extends from the back of head to tip of abdomen, it lies flat on it’s Back.
The bug has 6 legs and two antennae.
These nymphs crawl out of the water to hatch. You see them as early as December 15th, but they emerge heavily around February 15th.
The trout find them to be a valuable winter food source.