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Siphlonurus occidentalis (Gray Drake) Mayfly Adult Pictures

 This species emerges very late in the fall often along with Siphlonurus autumnalis just before ice forms on edges of streams.

This mayfly was collected from Crazy Beaver Spring on November 30th, 2006 and added to Troutnut.com on June 28th, 2011.

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Siphlonurus occidentalis (Gray Drake) Mayfly Adult from Crazy Beaver Spring in Montana
AuthorBnewell
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Siphlonurus occidentalis (Gray Drake) Mayfly Adult from Crazy Beaver Spring in Montana
AuthorBnewell

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