Compounds of formula (I), wherein the variables and the index have the following meanings: R1 H, halogen, alkyl, haloalkyl, alkenyl, haloalkenyl, alkylthio, alkoxyalkyl, alkylthioalkyl, or optionally substituted phenyl; R2 H, halogen, alkyl, haloalkyl, alkenyl, haloalkenyl or optionally substituted phenyl; A H, OH, CN, NO¿2?, halogen, SCN, alkoxy, haloalkoxy, alkenyloxy, alkylthio, haloalkylthio, alkylsulfinyl, alkylsulfonyl, aminothiocarbonyl, hydroxycarbonyl, alkoxycarbonyl, or aminocarbonyl; B H, OH, NH2, CN, NO2, halogen, optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkenyl, alkenyloxy, alkylthio, haloalkylthio, alkoxythiocarbonylthio, alkoxycarbonylalkoxy, alkoxycarbonylalkylthio, alkylsulfinyl, alkylsulfonyl, aminothiocarbonyl, NR?3R4¿, N=CHOR5, or N=CHNR?5; R3, R4¿ H, alkyl, alkoxycarbonylalkyl, [(alkoxycarbonyl)(alkenyl)]alkyl, alkoxycarbonylalkenyl, alkylcarbonyl, cycloalkylcarbonyl, alkylaminocarbonyl, diaminocarbonyl, alkoxycarbonyl, alkoxyaminosulfonyl, or di(alkoxy)aminosulfonyl; R5 alkyl, haloalkyl, or phenylalkyl; Q H, NO¿2?, halogen, haloalkyl, alkylamino, dialkylamino, alkoxy, haloalkoxy, or alkenyloxy; X H, halogen, haloalkyl, alkoxy or haloalkoxy; Y H, halogen, haloalkyl, alkoxy or haloalkoxy; Z H, halogen, haloalkyl, alkoxy or haloalkoxy; M N or CR?6; R6¿ H, NO¿2?, halogen or haloalkyl; n 0, 1, 2, 3, or 4, with the proviso that, when R?1¿ is hydrogen, n is not zero, processes for the preparation of compounds of formula (I), compositions containing them and their use for the control of insect and acarid pests and for the protection of plants from those pests as well as their use for treating, controlling, preventing and protecting warm-blooded animals and humans against infestation and infection by arachnids and arthropod endo-and ectoparasites.