The invention encompasses inter alia halogen-substituted compounds of the general formula (I) in which the radicals A1-A4, T, W, Q, R1 and Z1-Z3 have the meanings given in the description. Also described are processes for preparing the compounds of the formula (I). The compounds according to the invention are especially suitable for controlling insects, arachnids and nematodes in agriculture, and ectoparasites in veterinary medicine.本發明尤其是包括通式(I)之經鹵素取代的化合物,其中基團A1-A4、T、W、Q、R1和Z1-Z3具有說明中所給定之意義。亦描述者為用於製備式(I)化合物之方法。根據本發明之化合物尤其適合於控制農業中之昆蟲、蜘蛛和線蟲,及獸醫學中之外寄生蟲。