FIELD: chemistry.SUBSTANCE: invention relates to a condensed heterocyclic compound represented by formula (1). In formula (1), Rmeans a hydrogen atom, a C1-C3 alkyl group which may be optionally substituted with one or more halogen atom(s), a halogen atom, a C1-C3 alkoxy group, a C2-C4 alkoxycarbonyl group, a S(O)R, NRR, a nitro group or a cyano group; Rmeans a C1-C3 alkyl group; Rand Rare the same or different from each other and each represents a hydrogen atom or a C1-C3-alkyl group; n is 0, 1 or 2; and m is 0, 1 or 2; or its N-oxide. Also, the invention relates to a method for arthropod pest control, to a process for preparing a fused heterocyclic compound represented by formula (1)..EFFECT: new condensed heterocyclic compounds of formula (1) have been obtained which can be used for arthropod pest control.10 cl, 6 tbl, 145 ex
