House Centipede Identification Guide
The house centipede (Scutigera coleoptrata) is one of the most frequently submitted bugs to r/whatisthisbug. Fast-moving, with up to 30 long striped legs radiating from a 1-1.5 inch body, it's alarming to find — but actually beneficial. They prey on cockroaches, silverfish, spiders, and flies.
Low concern
| Quick ID Reference |
|---|
| Size | 1–1.5 inches body, legs extend 3+ inches |
| Color | Yellowish-gray with dark stripes on legs |
| Legs | 15 pairs (30 legs), very long |
| Speed | Extremely fast |
| Habitat | Damp basements, bathrooms, crawl spaces |
| Season | Year-round indoors |
Frequently Asked Questions
Are house centipedes dangerous?
House centipedes can technically bite but almost never do. Their venom is not medically significant for healthy adults — at worst, a mild bee-sting sensation. They are far more helpful than harmful, eating genuine pest insects.
Why do I have house centipedes in Philadelphia?
Centipedes follow their food. If you're seeing them, you likely have a secondary pest population (roaches, silverfish, spiders). They also need moisture — basements, bathrooms, and crawl spaces are prime habitat.
How do I get rid of house centipedes?
Reduce moisture with a dehumidifier, seal cracks in basement walls, and eliminate the prey insects they feed on. Sticky traps help monitor. Pesticide treatment is rarely needed unless the infestation is severe.
When should I call a pest control professional?
If you're seeing large numbers, finding entry points you can't seal, or if the infestation is affecting your quality of life, City Best Pest Control offers free inspections for Philadelphia, Montgomery County, Delaware County, and Bucks County residents. Contact us here.
