White Miller Caddisfly (nectopsyche species)

The White Miller is one of the long-horned caddisflies. They are easy to
distinguish from other caddisflies. The antennae are about one and one-half
times as long as their bodies are. That much identifies them as a long-horned
caddisfly and the other thing that ties them down as a White Miller is the light
cream, almost white color of their wings. Most species of White Millers prefer
weedy, slower moving water. They are also found in moderately flowing streams,
especially if they have heavy weed or other aquatic vegetation.

White Millers are species of the
nectopsyche genus of the Leptoceridae family of
caddisflies. These are called the tube case makers. I'm sure most of you eastern
anglers have seen this caddisfly, although they exist in trout streams in both the
East, Mid-west and West. The are very plentiful in many eastern trout streams.
The Firehole and Madison Rivers and some other streams in Yellowstone
National Park have plenty of them.

In some streams, like the two I just mentioned, these caddisflies hatch two times a
year. I am not sure if they are bi-brooded or if they are different species of the
nectopsyche genus just hatch twice a year. There is a hatch in the spring and
another in the late summer and early fall. I tend to think they are bi-brooded.
Most hatches last over a long time span during each of its two hatches and the
hatches are usually very prolific.

In Yellowstone streams we have been able to see these caddisflies emerging
during daylight hours but it is always very late in the day. We have been able to
catch trout lot of trout on the adult imitation during the late afternoons and early

In most eastern trout streams the hatches are very prolific but both the hatch and
the egg laying activity occurs during the night. We have found the banks, bushes
and tree fully covered with these caddisflies.  I have caught trout on our Perfect
Fly pupa and adult imitations in Eastern stream. If a hatch is underway, we
usually fish the pupa in the early morning and the adults late in the afternoons
after sunset with success.
Copyright 2013 James Marsh
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