Tetramorium bicarinatum

One of the species commonly found in homes, and also easily found nesting under bark or in building cracks at low elevations. It is called "two-ridged" because of the two bumps on the petiole, and "wrinkled" because of the wrinkle-like sculpture on its body. An omnivore with monomorphic workers and no soldiers, it has a fairly hard exoskeleton, sometimes catches small insects, and moves slowly.