Of the two species, the larger yellow ant (L. interjectus) is the most commonly encountered in Pennsylvania homes (Fig. 1). The workers are 4 to 4.5 mm long and have 12-segmented antennae, with the scape (first antennal segment) just reaching the top of the head. They have a single node to the pedicel connecting the thorax and abdomen, with sparse, erect hairs on the head, thorax, and abdomen.
The swarmers are approximately twice the size of the workers and have dark, smoke-colored wings. Like the workers, they can also vary in color from a light yellow to light reddish-brown.
Other than its size (workers are 3 to 4 mm), the smaller yellow ant looks similar to the larger yellow ant.
Pesticides are poisonous. Read and follow directions and safety precautions on labels. Handle carefully and store in original labeled containers out of the reach of children, pets, and livestock. Dispose of empty containers right away, in a safe manner and place. Do not contaminate forage, streams, or ponds.