Monstrous centipedes tend to attack anything that resembles food, biting with their jaws and injecting their poison.

Size	Fort DC	Damage	Size	Fort DC	Damage
Tiny	10	1 Dex	Huge	14	1d6 Dex
Small	10	1d2 Dex	Gargantuan	17	1d8 Dex
Medium	10	1d3 Dex	Colossal	23	2d6 Dex
Large	11	1d4 Dex

Poison (Ex): A monstrous centipede has a poisonous bite. The details vary by the centipede?s size, as shown on the table above. The save DCs are Consitution-based. The indicated damage is both initial and secondary damage.
Skills: Monstrous centipedes have a +4 racial bonus on Spot checks, and a +8 racial bonus on Climb and Hide checks. They can use either their Strength or Dexterity modifier for Climb checks, whichever is higher. Monstrous scorpions can take 10 on Climb checks, even if threatened or distracted.
SEE WIKIPEDIA ENTRY: Centipede

• Tiny
  
• Small
  
• Medium
  
• Large
  
• Huge
  
• Gargantuan
  
• Colossal
  

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System Reference Document -> List of Creatures (SRD)