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I forget the name of this pattern but you should drop into the fly shop in West Yellowstone and talk with them. These worked will on the Gibbon and Firehole Rivers. Have a blast! Take a camera, bulls will be everywhere!
thats a bitch creek nymph.good stonefly pattern.
you should have a lot of caddis patterns(small and green) and some pale morning dun dry flies.also some stimulators and hopper/cricket patterns. you might be better off fishing the bigger water of the madison towards ennis too. there you'd fish with giant streamers. if you go to the madison river fishing company shop in ennis, they will sell these huge streamers to fish the madison with. they catch fish...they're like 6" long or so.
Fish the Lamar for sure, just for its beauty, Another is Slough creek, awsome, You can hike up in the hills for the upper Slough ck also. Both will not let you down. Been there done this, I highly recomend these.