The debilis species hatch during the summer and fall of the year and the hatches usually
increase in size later in the year. They are usually slightly larger on the Western streams,
than they are in the East and Midwest, which are normally a hook size 18.
The mollis and guttata species are found on streams in the east and midwest and the
memorialis species is found on a few streams in the West. Neither of the species are
considered important, that is, unless you are there when they hatch and that is why we
have specific imitations of them. We found the mollis species plentiful in several eastern
The bicornula species is found on a few western streams in fair quantities at times.
There is also the gregalis, memorialis and temporalis species found in the western states.
The heteronea species is found on several western streams on both fast flowing
freestone rivers and streams as well as those with slow to moderate current. They are
slightly larger Mahogany Duns.
Copyright 2013 James Marsh
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