n large animal swarm 

Perception +10; darkvision

Skills Acrobatics +12

Str -4 Dex +4 Con +2 Int -5 Wis +2 Cha -1

AC  18; Fort +10, Ref +12, Will +8

HP 45; Immunities precision, swarm mind; Weaknesses area damage 5, splash damage 5

Speed 20 feet, fly 40 feet

Swarming Stings [>] Each enemy in the swarm's space takes 2d8 piercing damage (DC 21 basic Reflex save) and is exposed to wasp venom. A successful save negates the poison exposure.

Wasp Venom (poison) Saving Throw DC 21 Fortitude; Maximum Duration 6 rounds; Stage 1 1d6 poison (1 round); Stage 2 2d6 poison and clumsy 2 (2 rounds)

Bestiary, page 324.