Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
The mayflys in the attached photos hatch in great numbers for days, maybe weeks on Grindstone Lake near Hayward, Wisconsin. I'd like to know what kind they are, and any patterns recommended to match. Photos were taken June 25, 2008. Thanks, .....Dave
Dave, they are Brown Drakes (Ephemera simulans). The ones in the photos are male spinners. I'll let others suggest patterns for the adults. My favorite is a wiggle nymph pattern designed to imitate the slender burrowing nymphs as they swim toward the surface.