n medium animal 

Perception +17; darkvision, scent (imprecise) 60 feet

Skills Acrobatics +13, Stealth +13

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

AC  24; Fort +14, Ref +17, Will +12

HP 80

Speed 20 feet, fly 50 feet

Melee [>] proboscis +17 (finesse), Damage 2d10+7 piercing plus Grab and septic malaria

Blood Drain [>] Requirements The giant mosquito has a creature grabbed; Effect The giant mosquito uses its proboscis to drain blood from the grabbed creature. This deals 3d6 damage, and the giant mosquito gains temporary Hit Points equal to the damage dealt. A creature that has its blood drained by a giant mosquito is drained 1 until it receives healing of any kind or amount.

Septic Malaria (disease) The victim can't reduce its sickened condition while it's affected by septic malaria Saving Throw DC 24 Fortitude; Onset 1 day; Stage 1 sickened 1 (1 day); Stage 2 drained 1 and sickened 1 (1 day); Stage 3 as stage 2 (1 day); Stage 4 unconscious (1 day)

Bestiary 2, page 175.