Where & WhenRegion: West
In Mayflies: An Angler's Study of Trout Water Ephemeroptera , Knopp and Cormier report "occasional" fishable hatches of this species from southern Alberta, and its known range extends down the east slope of the Rockies into the United States.Hatching BehaviorTime Of Day (?): Late July through early September
Nymph BiologyEnvironmental Tolerance: Prefers cool water
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