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House Centipede

The house centipede is a common arthropod in Montreal basements. Although frightening in appearance, it is harmless and feeds on other harmful insects.

House Centipede

Identification sheet

Appearance
Elongated yellow-grey body with 15 pairs of long legs. Moves very quickly on walls and ceilings.
Size
25 to 35 mm
Color
Yellow-grey with dark bands
Habitat
Basements, bathrooms, damp dark places. Active at night, hides during the day in cracks.
Lifespan
3 to 7 years
Danger level
Very low

Health risks

House centipedes are virtually harmless to humans. Their bite is rare and comparable to a mosquito bite. Their large presence indicates a moisture or other insect problem.

Signs of infestation

  • Centipedes visible on walls or ceilings at night
  • Presence in bathroom or basement
  • Characteristic rapid movement
  • Increased presence of other insects (their prey)
  • Excessive moisture in certain rooms
  • Cracks in foundations

Prevention tips

  • Reduce humidity with a dehumidifier
  • Fix water leaks
  • Seal cracks in foundations
  • Improve basement ventilation
  • Eliminate other insects that attract them
  • Declutter dark and damp areas

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