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 one hatched in my house after I brought some nymphs home to photograph.
This mayfly was collected from unknown in Wisconsin on May 18th, 2004 and added to Troutnut.com by Troutnut on January 25th, 2006.