The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 183 records from GBIF, adults of this genus have mostly been collected during June (30%), July (25%), August (20%), May (14%), and September (7%).
In 12 records from GBIF, this genus has been collected at elevations ranging from 3 to 5968 ft, with an average (median) of 1761 ft.
Time of day: Afternoon or evening
Current speed: Fast
Environmental tolerance: Found in warm water or thermally marginal trout streams