Monstrous Scorpion, Tiny (CR 1/4)

Tiny Vermin
Alignment: Always Neutral
Initiative: +0; Senses: darkvision 60 ft., tremorsense 60 ft., and Spot +4

AC: 14 (+2 size, +2 natural), touch 12, flat-footed 14
Hit Dice: 1/2d8+2 (4 hp)
Fort +4, Ref +0, Will +0
Speed: 20 ft.
Space: 2 1/2 ft./0 ft.
Base Attack +0; Grapple -8
Attack: Claw +2 melee
Full Attack: 2 claws +2 melee and sting -3 melee
Damage: Claw 1d2-4, sting 1d2-4 and poison
Special Attacks/Actions: Improved grab, constrict 1d2-4, poison
Abilities: Str 3, Dex 10, Con 14, Int -, Wis 10, Cha 2
Special Qualities: Vermin
Feats: Weapon Finesse (claw, sting)
Skills: Climb +0, Hide +12, and Spot +4
Advancement: -
Climate/Terrain: Warm desert
Organization: Colony (8-16)
Treasure: None

Source: Monster Manual

Monstrous scorpions are vicious predators that make unnerving scuttling noises as they speed across dungeon floors. A monstrous scorpion has a low, flat body: 2 feet long, 1 foot wide* and 1-1/2 inches high**.
*The number includes the scorpion's body and its legs; the actual body width is about a third of the total.
**The number indicates the height of the creature's body; the creature's stinger usually is held about as high off the ground as the creature is wide.