Little Yellow Quills

I received some questions about the Little Yellow Quills that we have mentioned
in our "Hatches Made Easy" articles as well as we show on our hatch chart for
the Great Smoky Mountains National Park. Many of you may not be familiar with
this mayfly simply because it is usually confused with a Light Cahill.
The Little Yellow Quills usually show up about the middle of August but as we
mentioned recently, we have already seen some on the Walker's Camp Prong of
the Little Pigeon River. They are clingers which don't seem to mind the high
acidic water found in many of our streams.
These mayflies do look similar to a Light Cahill but they are usually much
smaller. They are a hook size 16 to 18 and the Light Cahills range from a hook
size 14 to 16. They are usually a full hook size smaller.
For you that are interested in the classification, these are a part of what the
entomologist call the
Heptagenia Group. The Heptagenia Group consist of
species of the
Leucrocuta and Heptagenia genera usually called Little Yellow
Quills and sometimes Pale Evening Duns but these are not true Pale Evening
Duns which are crawlers. These are
Leucrocuta species.
We have a specific "Perfect Fly" pattern for the nymph, emerger and the
emerger with the shuck still attached, the dun and the spinner.

The duns emerge in the mornings. The spinners start to fall during the hot
summer (like now) just before dark. Later when the weather cools down some,
they will start to fall two or three hours before dark.
These flies along with hundreds of other 'Perfect Flies" will soon be available
online for those that are interested. We will announce the details soon.

Copyright 2008 James Marsh
Click on Image for full size of
this "Perfect Fly" Little Yellow
Quill Clinger Nymph
Click on Image for full size of
this "Perfect Fly" Little Yellow
Quill Spinner
Click on Image for full size of
this "Perfect Fly" Little Yellow
Quill Dun.