sometime in the recent past Wilson posted this:
Don't know if this is the right place to ask, but this time of year in
New England we get what look like minute balls of white to whitish-blue
fuzz flying about. If you catch one, they look like little black flies
with bits of fuzz around the abdomen. Any ideas what they're called? The
air can get quite busy with them.
I think I've found it. Woolly Alder Aphid picture at http://tr.im/AtYz and
description at http://tr.im/AtWZ

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Wilson 44.69, -67.3