American March Browns

In the East and Midwest this is one of the most important hatches of the Spring. They are large flies which emerge sporadically, making for long days of good fishing.

This species contains the two classic Eastern hatches formerly known as Stenonema vicarium and Stenonema fuscom, the "March Brown" and "Gray Fox." Entomologists have discovered that these mayflies belong to the same species, but they still display differences in appearance which the trout notice easily. Anglers should be prepared to imitate both types.

This is the largest species of mayfly in North America. Sometimes it appears together with the Hexagenia limbata hatch or the Ephemera guttulata hatch, but in other places it creates excellent action on its own.