Giant Ant, Soldier (CR 2)

Medium Vermin
Alignment: Always Neutral
Initiative: +0; Senses: scent

AC: 17 (+7 natural), touch 10, flat-footed 17
Hit Dice: 2d8+2 (11 hp)
Fort +4, Ref +0, Will +1
Speed: 50 ft., climb 20 ft.
Space: 5 ft./5 ft.
Base Attack +1; Grapple +3
Attack: Bite +3 melee
Full Attack: Bite +3 melee
Damage: Bite 2d4+3
Special Attacks/Actions: Improved grab, acid sting
Abilities: Str 14, Dex 10, Con 13, Int -, Wis 13, Cha 11
Special Qualities: vermin
Feats: Track
Skills: Climb +10
Advancement: 3-4 HD (Medium-size); 5-6 HD (Large)
Climate/Terrain: Temperate plains
Organization: Solitary or gang (2-4)
Treasure/Possessions: None

Source: Monster Manual

Improved Grab (Ex): To use this ability, the giant ant must hit with its bite attack. A giant ant soldier that gets a hold can sting.

Acid Sting (Ex): The giant ant soldier has a stinger and an acid producing gland in its abdomen. If it successfully grabs an opponent, it can attempt to sting each round using its full attack bonus. A hit with the sting attack deals 1d4+1 points of piercing damage and 1d4 points of acid damage.

Giant ants fight with their powerful mandibles.

Giant ants are among the hardiest and most adaptable vermin. Soldiers and workers are about 6 feet long.