These tiny ants seem to be a bit smaller than pharoah ants. The easiest way to tell them apart around the house is that these are dark anteriorly and light posteriorly. If you let them crawl on your skin, you can't feel them unless they stop to bite. They don't sting but do bite, I'm guessing if they perceive that you may be a food source. They gather around water and eagerly finish up squashed bugs or food scraps.