One of the very few ants to show activity throughout the winter, in the region of the writer's home at Greenville, Tennessee, is Prenolepis imparis Say. During the mild days in winter these ants can be seen at the opening of their formicaries and they even do some excavating if the weather is very mild. Their small craters show that the excavations extend rather deep into the subsoil (red clay in this area) which is unusual for an ant so small. I decided to dig out some nests in order to study the make up of the nest and to determine how deep the nest extended.