Western March Browns
Like most common names, "Western March Brown" can refer to more than one taxon. For more detail click through to the scientific names.
Mayfly Species Rhithrogena morrisoni
These are pretty much always called Western March Browns.
These are the first sizable, fishable mayflies of the season on many Western trout streams.
Mayfly Species Rhithrogena hageni
These are often called Western March Browns.
According to Fred Arbona in Mayflies, the Angler, and the Trout, this is an excellent hatch and one of the most common fast-water mayflies in the West.
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