How about the following?
Stink Spray (Ex): 3/day, a giant stink beetle can spray a 10 ft cone of odoriferous chemicals. Any creature caught in the cone must make a DC X Fort save or be sickened for 1d6+4 rounds. If the victim possesses the Scent special quality, it is instead nauseated for 1d6 rounds and then sickened for 2d6 minutes. The save DC is Constitution-based.
Death Throes (Ex): When a giant stink beetle dies, it releases a stink spray attack instantly, regardless of how many times it has used that special attack that day.