Where & When
Region:Fred Arbona calls this species "fairly common throughout the West," but I have found no other information about it.
WestTime Of Year (?):
Pictures of 2 Mayfly Specimens in the Species Rhithrogena robusta:
Male Rhithrogena robusta Mayfly Spinner
View 3 PicturesThese specimens were collected from a mating swarm from the east branch of the North Fork of the Touchet River, upstream from the Bluewood Ski Area turn.It was a sunny warm day, mating swarm as 4-8 ft. above this small stream. Four male spinners were collected.Stream photos were taken.
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