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

Common Names

Match	Common Name
	Gray Drake
	Adams
	Dark Olive Dun
	Black Drake

This species may reinforce spinner flights of Siphlonurus quebecensis and Siphlonurus alternatus.

Where & When

Regions: East, Midwest

Time Of Year (?): May through June

Most accounts say this species hatches through June, but Knopp and Cormier in Mayflies: An Angler's Study of Trout Water Ephemeroptera say it may last through the end of September.

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Jargon Defined:

Spinner: There are two winged stages of adult mayflies. They emerge from the water as duns, molt on land (usually) into their fully mature stage, spinners. As spinners, they mate, lay eggs, and die.

Useful References:

Caucci, Al and Nastasi, Bob. 2004. Hatches II. The Lyons Press.

Knopp, Malcolm and Robert Cormier. 1997. Mayflies: An Angler's Study of Trout Water Ephemeroptera . The Lyons Press.

Leonard, Justin W. and Fannie A. Leonard. 1962. Mayflies of Michigan Trout Streams. Cranbrook Institute of Science.

Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.