[0] How to identify them? [Drywood Termites] Holes in the walls, floor or ceiling of your property will start to become visible however, this may only occur after several months. Sand-like dirt and droppings from a hole can often be found. [Subterranean Termites] 
Dirt trials or tubes will be going along the ground or up and down the sides of your house. You might be able to see termite mounds near your property.