N-arylamidine substituted trifluoroethyl sulfide derivatives of the formula (I) ** Formula ** in which n represents the numbers 0 or 1, X1, X2, X3, X4 independently of each other represent hydrogen, fluorine, chlorine, bromine, iodine, (C1-C4) alkyl, halo (C1-C4) alkyl, (C2-C4) alkenyl, (C2-C4) alkynyl, (C1-C4) alkoxy, (C1-C4) haloalkoxy, aminothiocarbonyl, or represent phenyl (C1-C4) alkyl, phenoxy, heteroaryl (C1-C4) alkyl, hetaryloxy, or cycloalkyl (C3-C6) -alkyl (C1-C4), cycloalkyloxy (C3-C6), cycloalkyl (C3-C6) -alkoxy (C1-C4) optionally saturated or unsaturated, optionally mono- or disubstituted with substituents the same or different from the group consisting of fluorine, chlorine, bromine, cyano, nitro, (C1-C4) alkyl, halo (C1-C4) alkyl, (C1-C4) alkoxy, haloalkoxy (C1-C4) or cycloalkyl (C3-C6) optionally saturated or unsaturated which is eventually interrupted by a heteroatom of the series consisting of O, S or N, or represent a cycloalkyl (C3- C6), f enyl, pyridyl, pyrimidyl, pyridazinyl, pyrazinyl, triazinyl, thiazolyl, thiadiazolyl, oxazolyl, oxadiazolyl, pyrazolyl, triazolyl or tetrazolyl which is optionally mono- or disubstituted with substituents equal to or different from the group consisting of fluorine, chlorine, bromine, cyano , (C1-C4) alkyl, halo (C1-C4) alkyl, (C1-C4) alkoxy, (C1-C4) haloalkoxy, (C3-C6) cycloalkyl, or X2 and X3 or X3 and X4 may form the following ring of 5 or 6 members which is optionally mono- to tetrasubstituted with fluorine or (C1-C4) alkyl, ** Formula ** or X2 and X3 or X3 and X4 may form the following condensed rings that are optionally mono- or disubstituted with equal substituents or different, where the substituents, independently of each other, can be selected from the group consisting of hydrogen, fluorine, chlorine, bromine, cyano, (C1-C4) alkyl, cycloalkyl ** Formula ** R3 represents (C1-C4) alkoxy -alkyl (C1-C4), cyanoalkyl (C1-C4), or represents a ring of 3 to 6 saturated or partially saturated members that may op
