How about the Giant Tick 3.5 from the upcoming REVISED Tome of Horrors:
Tick, Giant
Small Vermin
Hit Dice: 2d8 (9 hp)
Initiative: +0
Speed: 10 ft. (2 squares)
Armor Class: 17 (+1 size, +6 natural), touch 11, flat-footed 17
Base Attack/Grapple:+1/-3 (+1 when attached)
Attack: Bite +2 melee (1d4)
Full Attack: Bite +2 melee (1d4)
Space/Reach: 5 ft./5 ft.
Special Attacks: Attach, blood drain, disease
Special Qualities: Darkvision 60 ft, scent, vermin traits
Saves: Fort +3, Ref +0, Will +0
Abilities: Str 11, Dex 10, Con 11, Int —, Wis 10, Cha 2
Skills: Climb +4
Feats: —
Environment: Temperate forests
Organization: Cluster (3-6) or nest (7-12)
Challenge Rating: 1
Treasure: None
Alignment: Always neutral
Advancement: 3-6 HD (Small)
Level Adjustment: —
Giant ticks appear as 3-foot long ticks. They are otherwise similar to normal ticks.
Combat
Giant ticks attack by dropping on their prey from above and stabbing with a hollow mouth tube. If subjected to fire or immersed in water, a giant tick detaches from its victim.
Attach (Ex): If a giant tick hits with a bite attack, it uses it latches onto the opponent’s body. An attached giant tick is effectively grappling its prey. The giant tick has an AC of 17, and holds on with great tenacity. Giant ticks have a +4 racial bonus on grapple checks (already figured into the Base Attack/Grapple entry above).
An attached giant tick can be struck with a weapon or grappled itself. To remove an attached giant tick through grappling, the opponent must achieve a pin against the giant tick.
Blood Drain (Ex): A giant tick drains blood, dealing 1d4 points of Constitution damage in any round when it begins its turn attached to a victim. Once it has dealt 8 points of Constitution damage, it detaches crawls off to digest the meal. If its victim dies before the giant tick’s appetite has been sated, the giant tick detaches and seeks a new target.
Disease (Ex): Fifty percent of all giant ticks carry and deliver red ache with a bite attack. Roll individually for each giant tick in the cluster or nest.
Red ache: Fortitude DC 11, incubation period 1d3 days, 1d6 Strength damage. The save DC is Constitution-based.
Skills: Giant ticks have a +4 racial bonus on Climb checks.
Credit
The Giant Tick originally appeared in the First Edition Monster Manual (© TSR/Wizards of the Coast, 1977) and is used by permission.
15. Copyright Notice
Author Scott Greene, based on original material by Gary Gygax.