The Green Drake (Ephemera guttulatais) one of the largest mayflies available to trout. They hatch mid-day, and will cause trout to completely abandon any other type of food. The nymph emerges to the surface of the water quickly, and after drying its wings, flies off. This leaves little time for trout to grab a bite, so they become very opportunistic when they see the Dry Ice Green Drake fly pattern.