Magnify the ant. Determine if the ant is a one, or two-node ant. At the petiole of the abdomen, which is forward of the abdomen or end portion of the ant's body, are the nodes. The ant's nodes look like small bumps at the skinny end of the abdomen, and are clearly visible under a magnifying glass.
Note the color of the ant; many ants have different color patterns and characteristics. Although many ants may seem to be the same color, viewing them under a magnifying glass proves otherwise. Also note the approximate length of the ant.
Consult an ant identification chart, similar to the ones found on the University of Nebraska - Lincoln and University of California pages. The Nebraska charts are in full color, divided into one- and two-node ant types and identify the body specifics of the ant. The chart found on the University of California page identifies the ant's length, color and food preferences.