Drywood termites are a group of termites that do not need ground contact or moisture. They can live their entire life cycle inside a piece of structural timber or a piece of furniture. Their numbers are less than that of Subterranean termites and they tend to be a bit larger in size. Drywood termites generally swarm after sunset or at night, from May until November. However, they can swarm at other times. Their swarmers are generally brownish in color.
Subterranean termites must have ground contact or a secondary moisture source to live. Most are small and black in the swarmer phase. Subterranean termites generally swarm during the Spring and Summer months during the daytime (especially after a heavy rain). However, they can swarm at other times.