I found a couple of these little slow-moving monotomid beetles under a loose patch of bark on a fairly fresh oak log. The position of the orange areas on the elytra make me think this is R. sayi. This one was missing an antenna but I made a vertical flipped copy of the image in PhotoShop, rotated, and lassoed and moved the good antenna from the copy over to the original, flattened the image, and clone-stamped to make the background blend in.