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Prociphilus tessellatus
Pictures I see online for P.tessellatus look closer to what I found than G.impricator. But I am not completely sure.
Spotted on Jun 15, 2011
Submitted on Mar 13, 2013
3 Comments
Thanks to both of you!
Cool critter! The closest thing I've seen to this is beech blight aphid, Grylloprociphilus imbricator (it's among those included in the link that Gordon Dietzman gave you). They are found in big groups on beech twigs, and wave their cottony parts around when they are startled.
Possibly a woolly alder aphid. See http://www.ipm.iastate.edu/ipm/iiin/node... for more information. Also see http://bugguide.net/node/view/347779/bgp... for other possibilities. Will be interested in what you come up with for an ID.