What in the larval world is this?

No one at Duke seems to know what this is. Southern Fried Scientist has allowed me to copy verbatim his post in the hopes that maybe someone out there in TO95's world knows what this is!

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The following photo was taken near the Yadkin River in Davie, North Carolina. According to observers, there were millions of them attached to the sides of trees and undersides of leaves throughout the region. In some places they were hanging so thick they looked like tiny bats. Does anyone know what they are?

photo by Gregory Bonito (click to embiggen)

~Southern Fried Scientist