Bug Stomper

 is a challenge perk in Fallout: New Vegas. It is a Challenge Perk, thus is gained automatically after killing a certain number of 'insects'.

Despite being arachnids, not insects, Radscorpions count for this total.

''Pulling the legs off ants suits you well. You gain a damage bonus against insects.''

Effects
Bonus damage to mutated insects and arachnids (Radscorpions, Giant Ants, Radroaches, etc...). This perk stacks with other related perks such as Entomologist.