Mystery Insects Swarming Long Island Home: Thrips or Something Else?

A Long Island, NY resident reports a sudden infestation of tiny insects around the foundation, brick patios, and inside the home. Initially identified as thrips by a local entomologist, the homeowner describes them as larger than odorous house ants, varying in color (red, dark, brown), quick-moving, and hard to crush. No indoor plants, pets, or adjacent mulch/grass; recent plantings include Thuja Green Giants and two small trees. A landscaper sprayed twice for ticks/fleas with no effect. Concerned about bites on children.

Expert Response

The expert is skeptical of the thrips identification. Thrips are plant-feeders, rarely swarm foundations or invade homes, and are nearly microscopic. The description suggests another pest. The expert recommends submitting a sample to the Cornell Cooperative Extension in Suffolk County (ccesuffolk.org) for accurate identification, as they can forward specimens to Cornell if needed.

Follow-Up

The homeowner plans to submit a sample to the Riverhead Cornell office. The expert notes that if the insects are larger than odorous house ants, they are definitely not thrips. Springtails are a possibility—some species are larger, vary in color, have antennae, and can accumulate around homes after heavy rains or during droughts.