good bug or bad bug?
I trimmed a branch off our our pin oak that was hanging over our woodpile so that I had to duck when bringing firewood to the house and noticed this honeycomb-looking possibly egg sac tucked in the branch of the tree. I have removed this one, but wondering if I should be looking for (and eliminating) more.. or if they are possibly beneficial? it was small, about the size of my thumb tip to first thumb knuckle.
This looks like assassin bug eggs in your photo. Assassin bugs are beneficial and a predatory insect. They feed on a wide variety of pests. Leave them be. See more on our website http://extension.umd.edu/hgic/insects/predators-assassin-bugs