PestDecoderDecode a clue

Evidence guide

Wings and swarmers

Equal wing length, body shape, season and the point of emergence help separate termites, ants and seasonal flies.

Record the clue before interpreting it

Collect only detached wings if safe. Photograph both wing pairs, body waist and the exact window, wall or opening where they appeared.

A useful record includes scale, shape, texture, placement and whether the material returns after a clean baseline is established. Avoid changing the scene merely to make identification easier.

What to note

  • Equal or unequal wing pairs
  • Pinched or broad waist
  • Straight or elbowed antennae
  • Indoor emergence versus outdoor entry
Handling boundary

A large indoor termite swarm or repeated emergence from structural wood warrants prompt professional inspection.

Read the full safety guide

Common candidates

These candidates are not ranked until location, scale, pattern, context and timing are added. Open a profile to see confirming and contradicting evidence.

high concern

Subterranean termite

Rhinotermitidae

Mud shelter tubes, soft or hollow wood and equal-length swarmer wings near soil-connected routes.

Wings and swarmersHoles and openingsDamage and gnawing
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high concern

Drywood termite

Kalotermitidae

Uniform hard pellets in small piles directly below tiny wood openings, often recurring after cleanup.

Frass and pelletsWings and swarmersHoles and openings
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medium concern

Carpenter ant

Camponotus spp.

Coarse mixed wood shavings below a slit or crack, often with large ants and moisture-damaged wood nearby.

Frass and pelletsWings and swarmersHoles and openings
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low concern

Cluster fly

Pollenia spp.

Slow dark flies clustering at upper windows or attics seasonally, without an indoor food or drain breeding source.

Wings and swarmersOdors
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Comparisons that resolve common confusion

Side-by-side decision

Termite frass vs. carpenter-ant debris

Drywood termite pellets are uniform and hard; carpenter-ant debris is mixed and fibrous, often with insect fragments.

Wood pestWood pest

Open comparison

Side-by-side decision

Drywood vs. subterranean termite signs

Drywood termites push pellets from wood; subterranean termites preserve humidity with soil-connected shelter tubes.

Wood pestWood pest

Open comparison

Side-by-side decision

Termite pellets vs. powderpost beetle dust

Termite frass remains distinct pellets; powderpost frass behaves like fine flour around tiny round exits.

Wood pestWood pest

Open comparison

Side-by-side decision

Cluster flies vs. drain flies

Cluster flies are large, slow and seasonal at upper windows; drain flies are tiny, fuzzy and tied to wet film.

Seasonal flyMoisture fly

Open comparison

Source basis