Yeah. like I said. each one of those little bastiages has a pre-programmed drawing in it's diseased little mind, and every one of them is the same in that it is a single hole, that opens up into a world of destruction for the tree, always just under the bark so it destroys the trees circulatory system, and it can no longer move food or water along it's length.
Each bugs pattern is totally unique though, think snowflakes, very alike, but always different. Most are rambling ropey looking wandering around looking, but some traverse back and forth just like this one, but it is most certainly emerald ash borer.