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

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