White Miller
.............................Fly Fishing Yellowstone National Park

A few years ago, Angie and I were fishing the Firehole River around the first of
September when I noticed a different kind of caddisfly than I had previously seen on
the stream. I told her that it looked exactly like a White Miller. When we returned to our
room, I looked up the White Miller in a book and noticed that it was listed as an Eastern
species. According to the book, which I won't mention, it did not exist in the Western
United States.
The following day I captured some of the adults and photographed them in detail.
Returning home in late October, I developed the film to discover they were as far as I
could determine, White Millers, or at least a species of the
Nectopsyche genus.
I'm sure most of you eastern anglers have seen this caddisfly but I doubt you have
ever seen it in the quantities in the East to match that of the Firehole River. The White
Miller is also present in other streams in Yellowstone National Park. The Firehole.
Gibbon and Madison Rivers have this insect in large quantities. It has two emergences,
one in the spring and another in the late summer and early fall. I assume it is
bi-brooded. The hatch last a long time during each of its two hatches and is usually
very prolific. The trout eat both the hook size 16 emergers and the egg layers. This is a
caddisfly you do need to be familiar with if you fish the streams of Yellowstone National

Coming Up Next:
White Miller..(Nectopsyche sp) - Larvae, pupae and adults

Copyright 2008 James Marsh