The Sunriver Anglers Fly Tying Corner this month features a Callibaetis Biot Nymph pattern. This is an excellent pattern for imitating Callibaetis during mid-summer hatches of this prolific mayfly. Phil Fischer is a member of the Whiting Farms Pro Team and has tied flies since he was a young boy learning to fly fish. This video teaches a lot of subtle techniques that will really help improve your fly tying.
https://www.youtube.com/watch?v=0ztZVuYO1-E