The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
Here's a rather different tiny Baetid nymph. The tails are all unbanded, and the tergites all have a dark-colored anterior 2/3 and light-colored posterior 1/3. The gill veinlets are indistinct. It's probably a very early instar of some Baetis species.
This mayfly was collected from unknown in Wisconsin on January 31st, 2004 and added to Troutnut.com by Troutnut on January 25th, 2006.