Stonefly Species Hesperoperla pacifica (Golden Stone)

This species was better known under its former name, Acroneuria pacifica. It's the only stonefly in the angler's Golden Stone category which bears the scientifically accepted common name Golden Stone as well.

In 1955 in Matching the Hatch, Ernest Schwiebert wrote that this species is partially responsible for the "willow fly" hatches of the West, and he described some Colorado mating flightas as "really a spectacle to see." Modern anglers more often use "willowfly" to refer to the stonefly family Taeniopterygidae instead.  

Where & When

It is important in the West.

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