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Mayfly Species Siphlonurus rapidus (Gray Drake)

This species may reinforce spinner flights of Siphlonurus quebecensis and Siphlonurus alternatus.  

Where & When

Regions: East, Midwest

Time Of Year (?): May through June

Most accounts say this species hatches through June, but Knopp and Cormier in Mayflies: An Angler's Study of Trout Water Ephemeroptera say it may last through the end of September.

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