Female Tricorythodes (Tricos) Mayfly Spinner Pictures

Catching some fish on duns one early morning I pulled a cripple from the drift and noticed that the shuck looked cream colored to me. Has anyone else noticed this?

These Tricos are found on most reservoirs in the Great Basin. They come off the water late in the afternoon and early evening. They pull out of their subimago shuck on any object, cars, shirt sleeves, eye glasses, or rocks. They appear as clouds on most reservoirs and stimulate an Alfred Hitchcock-like feeding frenzy with the fish. They are short lived but what an impact. This hatch lasts for several weeks here in the Great Basin.
A good spent wing example can be found at Just2ty4.com.