Eastern Pale Evening Dun
As I stated in the previous article, the Eastern Pale Evening Dun, or Ephemerella
invaria, is one of the mayflies that are commonly called "Sulphurs" as well as a
"Eastern Pale Evening Duns". This is another good reason for using the scientific
names rather than common names. The dorothea (Sulphur) is quite similar to the
invaria (Eastern Pale Evening Dun) species but there are important differences in
color, hatch times, habitat and methods of imitating them. This mayfly is found in
the Eastern U. S. and in some Mid-western trout streams.
The body of the Sulphur is more of a true sulphur color than the Eastern Pale
Evening Dun. The Eastern Pale Evening Duns body is a tannish, yellow color.
The sulphur is also a hook size and sometimes two hook sizes smaller than the
Eastern Pale Evening Dun. These mayflies usually hatch late in the afternoon
from about 4:00 to 7:00 P. M. They hatch approximately two weeks earlier than
the Sulphur Duns.
Generally, you will find Eastern Pale Evening Duns in moderately flowing water.
These mayflies like faster moving water than the Sulphurs they are often
confused with. Most of the time you will find them at the ends of long runs. Large
pockets located within fast water areas may hold Sulphurs.
As I stated in the previous article, the Eastern Pale Evening Dun, or Ephemerella
invaria, is one of the mayflies that are commonly called "Sulphurs" as well as a
"Eastern Pale Evening Duns". This is another good reason for using the scientific
names rather than common names. The dorothea (Sulphur) is quite similar to the
invaria (Eastern Pale Evening Dun) species but there are important differences in
color, hatch times, habitat and methods of imitating them. This mayfly is found in
the Eastern U. S. and in some Mid-western trout streams.
The body of the Sulphur is more of a true sulphur color than the Eastern Pale
Evening Dun. The Eastern Pale Evening Duns body is a tannish, yellow color.
The sulphur is also a hook size and sometimes two hook sizes smaller than the
Eastern Pale Evening Dun. These mayflies usually hatch late in the afternoon
from about 4:00 to 7:00 P. M. They hatch approximately two weeks earlier than
the Sulphur Duns.
Generally, you will find Eastern Pale Evening Duns in moderately flowing water.
These mayflies like faster moving water than the Sulphurs they are often
confused with. Most of the time you will find them at the ends of long runs. Large
pockets located within fast water areas may hold Sulphurs.
Copyright 2009 James Marsh
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