**Mayfly Species Siphlonurus autumnalis (Gray Drake)**

Mayflies

Caddisflies

Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Siphlonuridae (Gray Drakes)

» Genus Siphlonurus (Gray Drakes)

» Species autumnalis (Gray Drake)

Common Names

Match	Common 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 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

Female 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

Siphlonurus 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

Your Thoughts On Siphlonurus autumnalis:

You must log in at the top of the page to post. If you haven't registered yet, it's this easy:

Mayfly Species Siphlonurus autumnalis (Gray Drake)

Where & When

Spinner Behavior

Pictures of 3 Mayfly Specimens in the Species Siphlonurus autumnalis:

Your Thoughts On Siphlonurus autumnalis:

Jargon Defined:

**Mayfly Species Siphlonurus autumnalis (Gray Drake)**