n large animal 

Perception +9; blood scent, scent (imprecise) 60 feet

Skills Athletics +8, Stealth +5 (+9 to Hide)

Str +5 Dex +3 Con +3 Int -5 Wis +1 Cha -5

Blood Scent The giant tsetse fly can detect blood within 30 feet. This is a precise sense against creatures within 30 feet that are bleeding.

AC  18; Fort +7, Ref +11, Will +5

HP 30

Speed 10 feet, fly 40 feet

Melee [>] proboscis +11, Damage 1d6+5 piercing plus sleeping sickness

Blood Draw [>] If the fly's last action was a successful proboscis Strike, it sucks its target's blood. The target takes 1d4 bleed damage (or 1d6 bleed damage if the target is an animal).

Sleeping Sickness (disease) Saving Throw DC 18 Fortitude; Stage 1 enfeebled 1 (1 day); Stage 2 enfeebled 1 and drained 1 (1 day); Stage 3 unconscious (1 day); Stage 4 as; Stage 3  (1 day)

Strength of Thousands #1: Kindled Magic, page 81.