Drywood termites build their nests inside the wood that they feed on and have contact with the soil. They also do not build mud tubes.
Another pivotal way in identifying drywood termites would be to examine the alates. Once drywood alates land, they shed their wings in a matter of minutes, and you would find them crawling around wingless.
A close inspection of soldier drywood termites would reveal them having teeth on their jaws and having round heads in most species. The worker termites on the other hand feed along and across the grain of wood.
The fecal pellets of drywood termites are rather hard and sand-like. Kick-holes will be present with small granules scattered on the ground below the infested wood.
When subterranean termites leave the ground, they build mud tubes or termite runways as passageways to new feeding grounds through breaches in cement and concrete. These tunnels serve as protection against ants and dehydration.
Most species of subterranean soldier termites possess rectangular heads and have no teeth. However, they can be easily identified by the white sticky latex that they discharge from their enlarged heads when aggravated.
Besides that, worker termites feed only along the grain of the wood. Their fecal are rather moist unlike drywood termites.