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Mayfly Species Siphlonurus autumnalis (Gray Drake)

Taxonomic Navigation -?-
» Species autumnalis (Gray Drake)
Common Names
MatchCommon Name
****Gray Drake
*Black Drake
Pictures Below ↓
I have never seen Siphlonurus autumnalis mentioned in the angling literature, but these flies would be a good mouthful for a trout and could be important if they're ever found in abundance.  

Where & When


Region: West

Time Of Year (?): Fall

The name seems to suggest a fall emergence, which would explain why I caught one at the end of September in the Washington Cascades.

Spinner Behavior


My only encounter with this species was with ovipositing females late in the morning on a sunny day.


Pictures of 3 Mayfly Specimens in the Species Siphlonurus autumnalis:

Female Siphlonurus autumnalis (Gray Drake) Mayfly SpinnerFemale Siphlonurus autumnalis (Gray Drake) Mayfly Spinner View 8 PicturesI found this specimen and saw a few more of its kind during midday on a small, steep, rocky creek fairly high in the Cascades, different from the previously reported habitats of its species.
Collected September 29, 2020 from Mystery Creek #249 in Washington
Added to Troutnut.com by Troutnut on November 10, 2020
Siphlonurus autumnalis (Gray Drake) Mayfly NymphSiphlonurus autumnalis (Gray Drake) Mayfly Nymph View 1 Pictures
Collected August 31, 2007 from Crazy Beaver Spring in Montana
Added to Troutnut.com by Bnewell on June 28, 2011
Female Siphlonurus autumnalis (Gray Drake) Mayfly SpinnerFemale Siphlonurus autumnalis (Gray Drake) Mayfly Spinner View 1 Pictures
Collected November 30, 2006 from Crazy Beaver Spring in Montana
Added to Troutnut.com by Bnewell on June 28, 2011

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