a bigger head. Second color they can be all black or black and red,Third look between thier abdomen and thorax ( basically the second and third section) of the ant on the skinny part or the pinched waist area for whats callled a single node.. This a raised area, carpenter ants have one other black ants have two. if it is carpenter ants you need to have a thorough inspection done to determine any other areas of infestation. They generally come in from trees and wood piles and prefer wet areas in wood. they do not eat the wood they destroy and can be as significant as termites. You also need to check for termites because termites and carpenter ants go hand in hand, the reason is termites are basically 90 % sugar water,Termites eat cellulose which make something similar to glucose. Ants love them and the same areas that are condusive to carpenter ants are good for termites You should have your home professionally treated with ac ombination of methods dust baits, liquid pesticides and borates. It may onle be odorous house or another type of ant which is where you would use Termidor outside only as a barrier.