Abstract: Compounds with arthropodicidal activity having the general formula (I); ##STR1## wherein R.sup.1 is a halo group; or a lower alkyl, lower alkoxy or lower alkylthio group, in each of which the alkyl group may be substituted with one or more halo groups; R.sup.2 is hydrogen or a halo or methyl group; or R.sup.1 and R.sup.2 together form a methylenedioxy, or a difluoro-methylenedioxy group or, R.sup.1 and R.sup.2 together with the carbon atoms to which they are attached, form an aromatic ring; R.sup.3 is hydrogen, CN, or C.ident.CH; Y is --CH-- or --N--; Z is H or F; and X.sup.1, X.sup.2, X.sup.3, and X.sup.4 are the same or different and each is hydrogen or a fluoro, bromo or chloro group; with the proviso that Y is --N-- when Z is H.