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Mayfly Species Siphlonurus alternatus (Gray Drake)

Pictures Below
This species occasionally produces important spinner falls. Its spinners may join the swarms of Siphlonurus quebecensis or Siphlonurus rapidus, amplifying the importance of all three species.  

Where & When


Regions: East, Midwest

Time Of Year (?): Early May through early September; peaking from late June through July


Spinner Behavior


Time Of Day: Evening

Habitat: Riffles

Pictures of 1 Mayfly Specimen in the Species Siphlonurus alternatus:


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