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.
Described by Newman, E.A. (1839) On the Synonymy of the Perlites, together with brief charaters of the old and of a few new species. Art. IV. Magazine of Natural History 3, 32–37, 84–90.