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.
This specimen was 22 mm.
This caddisfly was collected from Mystery Creek #178 in Idaho on September 15th, 2013 and added to Troutnut.com by Entoman on September 23rd, 2013.