n medium animal 

Perception +7; darkvision, web sense

Skills Acrobatics +7, Athletics +5, Stealth +7

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

Web Sense The spider swarm has imprecise tremorsense to detect the vibrations of creatures touching its web.

AC  17; Fort +6, Ref +9, Will +5

HP 16

Spring Upon Prey [R] (attack) Trigger A creature touches the hunting spider's web while the spider is on it. Requirements Initiative has not yet been rolled. Effect The hunting spider automatically notices the creature and Strides, Climbs, or Descends on a Web before it rolls initiative.

Speed 25 feet, climb 25 feet

Melee [>] fangs +9 (finesse), Damage 1d6+2 piercing plus hunting spider venom

Ranged [>] web +7 (range increment 30 feet), Effect web trap

Descend on a Web (move) The hunting spider moves straight down up to 40 feet, suspended by a web line. It can hang from the web or drop off. The distance it Descends on a Web doesn't count for falling damage. A creature that successfully Strikes the web (AC 20, Hardness 3, 5 HP) severs it, causing the spider to fall.

Hunting Spider Venom (poison) Saving Throw DC 16 Fortitude; Maximum Duration 6 rounds; Stage 1 1d10 poison and flat-footed (1 round); Stage 2 1d12 poison, clumsy 1, and flat-footed (1 round); Stage 3 2d6 poison, clumsy 2, and flat-footed. (1 round)

Web Trap A creature hit by the hunting spider's web attack is immobilized and stuck to the nearest surface until it Escapes (DC 17).

Bestiary, page 306.