Sulphurs

Mayflies

Caddisflies

Stoneflies

Scientific Name

Match	Scientific Name
	Epeorus vitreus

This very common name can also be spelled "sulfur," as can the metal and color after which the mayflies are named. Fishermen use both spellings frequently, and according to the dictionary both are correct.

This common name refers to only one species.

Mayfly Species Epeorus vitreus

These are often called Sulphurs.

This is the second most common Epeorus species in the East and Midwest. Most anglers will encounter sporadic hatches of Epeorus vitreus once in a while, and sometimes a more concentrated emergence causes a good rise of fish.

Epeorus vitreus (Sulphur) Mayfly Nymph

View 6 Pictures

Collected February 7, 2004 from in
Added to Troutnut.com by on January 25, 2006

Male Epeorus vitreus (Sulphur) Mayfly Dun

View 4 PicturesThis is my favorite mayfly from 2004, and it appears on my popular Be the Trout: Eat Mayflies products. Check them out!

Its identification is really up in the air. It might be a late-season vitreus dun but it may very well be one of the more obscure species in that genus.

Collected September 2, 2004 from in
Added to Troutnut.com by on January 25, 2006

Female Epeorus vitreus (Sulphur) Mayfly Spinner

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Collected September 19, 2006 from in
Added to Troutnut.com by on October 4, 2006

See 12 more specimens...

Jargon Defined:

Dun: Mayflies have two adult stages. They first emerge from the water as duns (scientifically known as the subimago stage). They then molt into the spinner (imago) stage, in which they mate and die. Sometimes the word "dun" is confusingly used to refer to a brownish gray color in fly tying materials.

Emergence: The transformation of a nymph or pupa into the adult winged stage of an insect. The term may refer to the emergence of an individual, or the daily or yearly event in which all individuals of a species emerge.