Solenopsis molesta (Say)
common name: thief ant

This is called the "little yellow ant," and is frequently found in houses in great numbers. They sometimes eat vegetable food, and some of my garden seeds have severely suffered from their attacks. They also devour grease, olive oil, &c. Their sting is like the puncture of a very fine needle. I placed a piece of meat on a window board frequented by these little depredators; it was soon absolutely covered by them, and thus enabled me to destroy thousands, every few hours that I returned to examine the bait, for several days, during which time their apparent numbers scarcely diminished.