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Mayfly Species Rhithrogena futilis (Western Gordon Quill)

This uncommon and slightly larger species hatches earlier than Rhithrogena hageni, but otherwise is virtually indistinguishable.  

Where & When

Region: West

Time Of Year (?): Late May through July

The best populations of futilis are in the upper Northwest, but they are found elsewhere in the Rockies.

Hatching Behavior

Time Of Day (?): Morning

Spinner Behavior

Swisher and Richards mention in Selective Trout that the duns of this species are not important but the spinners can be.

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