Check out this link to see a great comparison between drywood termite frass and carpenter ant frass which closely resembles sawdust.

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We explain and illustrate how to identify carpenter ants - what carpenter ants look like, why and where they attack buildings, and how to cure a carpenter ant infestation using pesticides or other methods. Black ants and carpenter ants are both quite common, widely found in North America. They may also be found in living areas, especially if the ants have been gorging on the flooring, different wooden structures, and other building/home materials. Flea dirt collects on pet bedding and other areas where the pet rests, and on the pet itself, particularly near the skin of the lower abdomen. However, termites eat wood.
The size of the two is the most obvious difference, with the carpenter species more than three times bigger than that of the black ant. It can be tricky to tell the difference between the two. Homeowners can identify drywood termites using their droppings that are usually originate in the form of pellets. Bed bug frass is visible on bed linens. When it comes to the color, termite frass differs greatly depending on the kind of wood and cellulose food source, ranging from dark brown to beige. Carpenter ant droppings. Carpenter ant infestation photo guide: This article describes carpenter ants and how to inspect a building for carpenter ant damage. The waste they kick out of their galleries consists solely of oval-shaped fecal pellets that fall below the nest. Think you may have found termite droppings in your home? Carpenter ant droppings; Termite and carpenter ant frass both have the same color as the affected lumber. Often, these pellets look like coffee grounds, however, they can imitate the appearance of sand and sawdust as well. Carpenter ant and termite frass often accumulates in basements, crawlspaces and attics near exposed wooden framing members. Carpenter ant frass typically collects in attics, basements, and crawlspaces near open or bare wooden frames or woodworks.

The black ant, however, is more widespread, covering areas such as Europe, Asia and parts of North America.