Needle Flies (Leuctridae Family of Stoneflies)
Species of this Leuctridae family of stoneflies are fairly easy to identify as adults
because their wings roll around their bodies. This gives them a “needle-like”
appearance. These stoneflies are usually called “Needle Flies” and sometimes
“Black Roll Wing Stoneflies”.They are very small, slim, dark stoneflies.
They are often confused with caddisflies. They resemble caddisflies in flight. In
fact it is very difficult to tell them from caddisflies without catching one. When
you do you will see the difference very quickly. It is just the way they fly,
especially when the females are depositing their eggs, that makes them look like
larger caddisflies depositing their eggs.
Emergence is somewhat variable. We show them on our hatch charts hatching
from mid August all the way through the first week of December depending on
the stream. There are a lot of species, all of which look very similar. They are
easy to distinguish from other stoneflies because of their long bodies.
Copyright 2013 James Marsh
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