The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
My hunch is we got us a whole lot o' intergradin' goin' on round heah! :)
Well, Foghorn Leghorn aside, that was the gist of A&E's paper regarding our state. Intergrades between the two species where their ranges overlap coupled with the curious phenomenon of specimens of both becoming more spiny as their ranges move westward toward the coast renders their keys unworkable for us. Sure like to know how the later M&M paper determined that coloradensis inhabits our coastal counties.