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Mayfly Species Siphlonurus autumnalis (Gray Drake)

Taxonomic Navigation -?-
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 by Troutnut on November 10, 2020

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