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.
Notice the leg markings on this specimen vs. your specimen of the female distinctus and the male specimen of verticus on the other thread. I'm not aware of any description pointing out the significance of this but it's interesting.
Foreleg pale with ferruginous tip to femur; joint between tibia and tarsus piceous or purplish and also the joints between tarsal segments.