Little Brown Caddis:
.............................Fly Fishing Yellowstone National Park

Little Brown Caddis (Lepidostoma pluviale) - Larva, Pupa, and Adult

The Little Brown Caddis or Little Brown Sedge, whichever name you prefer, larva is a
cased larva that is circular in shape and usually made of sand. It is the most plentiful
species of the large
Lepidostoma genus in the Western United States.
Although I am fairly sure the trout eat the cased larvae, I have not tried an imitation of

The pupae emerge out in the stream as opposed to crawling out of the water. They are
reported to emerge in the surface skim.
We have taken trout using imitations of the pupae. The ones we have found in the
Yellowstone River where they are fairly plentiful, are a hook size 18. We have also
found the LIttle Brown Caddis in the Firehole and Madison Rivers. They are probably
found in several other similar type streams in the park.
We fished the pupa imitation down and across allowing the fly to swing to the surface.  
Most of our fishing has been done in the smoother flowing water. Our best results has
come just prior to dark.

The eggs laying females deposit their eggs on the surface of the water and actually
ride the surface for a few seconds. Dry fly imitations of them work very well. In the
smooth water where they are usually found, we prefer to use a down and across
presentation to individual rising fish. We fish the dry adult imitation late in the day up
until dark.
There are usually a lot of other caddisflies on the water at the same time the Little
Browns appear. If these caddisflies are plentiful, be sure to try an imitation of the pupa
and adults, even though the Spotted Sedges and other species may also be present.

Coming Up Next:
Little Brown Caddis (Lepidostoma pluviale)- Fly Pattern Colors

Copyright 2008 James Marsh