This rule extends time-limited tolerances for residues of the insecticide tebufenozide and its metabolites in or on undelinted cotton seed at 0.2 part per million (ppm), cottonseed meal 0.5 ppm, cottonseed oil 1.3 ppm, cottonseed hulls 0.8 ppm, cotton gin byproducts 4.0 ppm, for an additional 18 months, to December 31, 1999. This action is in response to EPA's granting of an emergency exemption under section 18 of the Federal Insecticide, Fungicide, and Rodenticide Act authorizing use of the pesticide on cotton. Section 408(l)(6) of the Federal Food, Drug, and Cosmetic Act (FFDCA) requires EPA to establish a time-limited tolerance or exemption from the requirement for a tolerance for pesticide chemical residues in food that will result from the use of a pesticide under an emergency exemption granted by EPA under section 18 of FIFRA.