This species represents the earliest and often most important hatch of Large Stoneflies on many western rivers. During the late winter and early spring, its hatches are a welcome relief for the angler tired of squinting at baetids and equally tiny Dark Winter Stones. Trout must feel the same way about them as they often feed ravenously when they appear. See the Skwala genus hatch page for more information and likely photos of this species.
» Species americana (Large Springfly)
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