dun

Also, duns are dull and generally sober colored, whilst spinners are more brightly colored and shining and their wings are clear and transparent.

We have besides for this Month a little Dun call'd a whirling Dun (though it is not the whirling Dun indeed, which is one of the best Flies we have) and for this the dubbing must be of the bottom fur of a Squirrels tail and the wing of the grey feather of a Drake.