# Subterranean termite (swarmer)

*Reticulitermes spp.*

**Identification confidence:** Identifiable with care — The swarmer-versus-flying-ant distinction is reliable for a careful non-expert and is the highest-value identification on this site.


## How to recognise it

- The waist is broad and straight — the body reads as a single uniform tube with no pinch. A flying ant has a sharply pinched, narrow waist. This is the most reliable feature.
- All four wings are the same length and shape, and extend well past the tip of the abdomen. A flying ant's forewings are clearly longer than its hindwings.
- The antennae are straight and beaded like a tiny string of pearls, not elbowed. A flying ant's antennae bend sharply.
- Wings detach very easily, so piles of equal-length discarded wings on windowsills and in spider webs are often the first evidence found.
- Body is dark brown to black, 6 to 10 mm including wings.

## What it leaves behind

- Pencil-width mud tubes on foundation walls, piers, and crawl space surfaces — the definitive subterranean termite sign.
- Piles of shed wings of equal length on windowsills, in spider webs, or near light fixtures, typically in spring.
- Wood that sounds hollow when tapped, and blistered or darkened paint over damaged areas.
- Damaged wood packed with soil, which distinguishes subterranean damage from the clean galleries of drywood termites.

## Why an infestation persists

This is the mechanism that explains why treating visible damage does not solve the problem. Subterranean colonies live in the soil, not in the wood they eat, and reach the structure through shelter tubes that protect them from drying out. The colony may be substantial and some distance from the damage you can see, so removing or repairing damaged wood addresses the symptom and leaves the colony intact. Swarming is a reproductive event from a mature colony — typically several years old — which is why swarmers indoors are a serious finding rather than a nuisance. Foraging is driven by moisture, so anything that keeps soil damp against the structure increases pressure.


## Where it occurs

Every state except Alaska, with the greatest activity across the Southeast and the southern half of the country. Formosan subterranean termites are established along the Gulf Coast, in Hawaii, and in parts of California.

## What prevents it

- Eliminate wood-to-soil contact — deck posts, fence rails, siding, and trim that reach the ground are direct entry routes.
- Correct drainage so water moves away from the foundation, and repair leaking taps, gutters, and downspouts.
- Keep crawl spaces ventilated and dry, and remove cellulose debris such as form boards, stumps, and buried scrap wood.
- Maintain a visible inspection gap between soil or mulch and the bottom of siding, so tubes cannot be built out of sight.

## Commonly confused with

- **Carpenter ant** (*Camponotus spp.*) — The thorax seen from the side is evenly rounded in a single smooth arch, with no spines or dips. This is the most reliable carpenter ant feature and it separates the genus from nearly every other large ant.
- **Drywood termite** (*Incisitermes spp. / Cryptotermes spp.*) — Fecal pellets are the defining evidence — hard, elongated, roughly 1 mm, six-sided in cross-section with concave faces, and they range from pale cream to dark brown regardless of the wood colour.

**Verdict:** professional-recommended. A colony in the soil cannot be assessed or addressed from inside the building, the damage is structural, and in a real-estate transaction a documented inspection is usually required. This is one of the clearest cases on the site where professional involvement is genuinely warranted.


Source: https://againstpest.shop/identify/termites/subterranean-termite-swarmer/