Citronella ants and termites are frequently confused because both produce winged swarmers that show up indoors, often emerging from cracks in basement floors or around foundations. The good news: citronella ants cause zero structural damage. Termites, on the other hand, feed on wood and can compromise your home. Telling them apart quickly matters, and a few simple physical features make it straightforward.
Why They Get Confused
Both citronella ants and subterranean termites live underground, and both send out winged reproductive insects (swarmers) that can enter your home through expansion cracks in concrete slabs, gaps around door frames, and foundation openings. If you’ve never seen either species before, a cloud of small, yellowish-brown winged insects crawling out of your basement floor looks alarming regardless of what they are. Citronella ants are yellow to yellowish-brown, which makes them look even more like termites than darker ant species would.
Three Fast Ways to Tell Them Apart
You only need to look at three body features to identify which insect you’re dealing with. Grab one (or find a dead one) and look closely.
- Waist: Citronella ants have a clearly pinched, narrow waist between the thorax and abdomen. Termites have a broad, thick waist with almost no narrowing, giving them a more uniform, tube-shaped body.
- Antennae: Citronella ants have bent (elbowed) antennae. Termite antennae are straight, like a string of tiny beads.
- Wings: On a citronella ant, the front wings are noticeably longer than the hind wings. On a termite, all four wings are the same length and roughly twice the length of the body.
If you’re still unsure, crush one between your fingers. Citronella ants release a strong lemon or citronella scent, which is how they got their common name. Termites produce no such odor. This smell test is reliable enough that entomologists recommend it as a field identification method.
Citronella Ant Basics
There are two common species of citronella ant: the larger yellow ant and the smaller yellow ant. Both are yellow to yellowish-brown, live underground, and produce that characteristic lemon smell. The larger species is distinguished mainly by subtle differences in body structure and overall size, but their biology and behavior are essentially the same.
Citronella ants feed exclusively on honeydew, a sugary liquid produced by aphids and other sap-feeding insects. They actually tend underground aphid colonies the way farmers tend livestock, protecting the aphids in exchange for food. They do not eat wood, they do not eat household food, and they do not sting. Their nests are typically in soil: under lawns, in gardens, beneath concrete slabs, next to foundations, under large rocks, or inside rotting logs. They go unnoticed most of the year because they spend nearly all their time underground.
The only time citronella ants become visible is during swarming events, when winged reproductives leave the colony to mate. Swarms near heated buildings can happen earlier or later in the season than normal, because the warmer soil temperatures around foundations trick the colony into thinking conditions are right. These swarmers find their way inside through cracks and gaps, and while a sudden appearance of hundreds of winged insects in your basement is startling, the event is temporary and harmless.
How Termites Differ in Behavior
Termites are a fundamentally different problem. Subterranean termites feed on cellulose, the structural material in wood, and they can cause serious damage to framing, joists, and other wooden components of a building over months and years. A termite swarm indoors signals that a colony is living close to or within the structure, and that colony has likely been feeding on wood for some time before producing swarmers.
Termite colonies also live underground and build mud tubes to travel between the soil and their food source. These pencil-width mud tubes running along foundation walls, piers, or floor joists are one of the clearest signs of an active infestation. Citronella ants build no such tubes.
What to Do After Identifying Swarmers
If the swarmers are citronella ants, you typically don’t need to do anything beyond vacuuming them up. They aren’t establishing a colony inside your home; the swarmers entered from an outdoor nest and will die without returning to soil. Sealing cracks in your slab and gaps around door frames can reduce the number that get inside during future swarms, but the ants themselves pose no threat to your home or belongings.
If the swarmers are termites, the situation is different. A termite swarm indoors means an established colony is nearby and likely already feeding on structural wood. Professional inspection is the standard next step, since the extent of damage and the colony’s location both need to be assessed before treatment makes sense. Termite damage is rarely an emergency in the sense that a building is about to collapse, but it does worsen over time, so acting within weeks rather than months matters.
Other Clues Around Your Home
Beyond the insects themselves, the context of where and how you find them offers additional information. Citronella ant swarmers tend to appear in bursts, often concentrated around a single crack or opening, and the event is over within a day or two. You may notice small mounds of soil pushed up through cracks in the slab, a byproduct of their underground excavation. There will be no damage to any wood in the area.
Termite evidence looks different. Look for mud tubes on foundation walls or support columns. Tap exposed wood with the handle of a screwdriver; termite-damaged wood sounds hollow and may feel soft. You might also find small piles of discarded wings near windowsills or light sources, since termite swarmers shed their wings after mating. Citronella ants shed wings too, but the wing size difference (unequal versus equal length) can help you identify which species left them behind even after the insects are gone.