Small (Outsider (Extraplanar, Water)) CR 3
HP 19, hd3d8+6 AC 16 (+1 size, +5 natural), touch 11, flat-fooded 16 Fort +4, Ref +3, Will +3 Speed 30 ft. (6 squares), fly 40 ft. (average), swim 30 ft. Initiative +0 Spot , Listen
Standard attacks BAB +3, Grapple +1
Attacks
Full attack: 2 claws +6 melee (1d3+2)
Special Attacks/Qualities
Breath weapon, spell-like abilities, summon mephit
Damage reduction 5/magic, darkvision 60 ft., fast healing 2
Skills Bluff +8, Escape Artist +6, Hide +10, Listen +6, Diplomacy +4, Disguise +2 (+4 acting), Move Silently +6, Spot +6, Swim +10, Use Rope +0 (+2 with bindings)
Feats Power Attack, Toughness
Str 14 Con 13 Dex 10 Int 6 Wis 11 Cha 15
Alignment Usually neutral, Environment Elemental Plane of Water, Organisation Solitary (1), gang (2?4 mephits of mixed types), or mob (5?12 mephits of mixed types)

Ooze mephits come from the Elemental Plane of Water. An ooze mephit is about 4 feet tall and weighs about 30 pounds.
Ooze mephits speak Common and Aquan.

Breath Weapon (Su): 10-foot cone of caustic liquid, damage 1d4 acid, Reflex DC 13 half. Living creatures that fail their saves are tormented by itching skin and burning eyes unless they have immunity to acid or are otherwise protected. This effect imposes a ?4 penalty to AC and a ?2 penalty on attack rolls for 3 rounds. The save DC is Consitution-based and includes a +1 racial bonus.
Spell-Like Abilities: Once per hour an ooze mephit can hurl an acidic blob that functions like acid arrow (caster level 3rd). Once per day it can create a mass of smelly fog that duplicates the effect of stinking cloud (DC 15, caster level 6th). The save DC is Charisma-based.
Fast Healing (Ex): An ooze mephit heals only if in a wet or muddy environment.
Skills: An ooze mephit has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.

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System Reference Document -> List of Creatures (SRD)