NOVELTY - Aryloazol-2-yl-cyanoethylamine compounds (I) and their salts are new.    USE - In pesticidal composition; and for treating endoparasiticidal infection and ectoparasiticidal infection in mammal. The endoparasiticidal infection is helminth selected from Anaplocephala, Ancylostoma, Anecator, Ascans, Brugia, Bunostomum, Capillaria, Chabertia, Cooperia, Cyathostomum, Cylicocyclus, Cylicodontophorus, Cylicostephanus, Craterostomum, Dictyocaulus, Dipetalonema, Dipylidium, Dirofilaria, Dracunculus, Echinococcus, Enterobius, Fasciola, Filaroides, Habronema, Haemonchus, Metastrongylus, Moniezia, Necator, Nematodirus, Nippostrongylus, Oesophagostumum, Onchocerca, Ostertagia, Oxyuns, Paracaris, Schistosoma, Strongylus, Taenia, Toxocara, Strongyloses, Toxascaris, Trichinella, Trichuris, Trichostrongylus, Triodontophorous, Uncinaria and Wuchereria (preferably Haemonchus contortus, Ostertagia circumcincta, Trichostrongylus axei, Trichostrongylus colubriformis, Cooperia curticei and Nematodirus battus). The ectoparasiticidal infection is selected from fleas, ticks, mites, mosquitoes, flies, lice and blowfly (claimed).    ADVANTAGE - The compounds (I) exhibit high activity and improved safety to the user and environment, which are obtained by optimization of chemical, physical and biological properties, e.g solubility, melting point, stability, electronic and steric parameters.    DETAILED DESCRIPTION - An aryloazol-2-yl-cyanoethylamine compounds of formula (I) and their salts are new.    P'=CR1 or N;    Q=CR2 or N;    V'=CR8 or N;    W'=CR9 or N;    X=CR10 or N;    Y'=CR11 or N;    R1, R2 R8, R9, R10 and R11=H, amino, amido, cyano, nitro, halo, alkenyl, alkynyl, cycloalkyl, hydroxyalkyl, (halo)alkyl, (halo)alkylthio, arylthio, phenoxy, alkoxyalkoxy, cycloalkyloxy, (halo)alkoxy, (halo)alkylcarbonyl, (halo)alkylsulfinyl, alkylsulfonyl, alkylamino, di(alkyl)amino, alkylcarbonylamino, alkylaminoalkoxy, dialkylaminoalkoxy, alkylaminoalkyl, dialkylaminoalkyl, aminoalkyl, formyl, HO2C-, alkyl-O2C-, or aryl or phenoxy (both optionally substituted with cyano, nitro, halo, (halo)alkyl, (halo)alkylthio, arylthio, (halo)alkoxy, (halo)alkylcarbonyl, (halo)alkylsulfinyl or (halo)alkylsulfonyl);    R3, R4 and R5=cycloalkyl (optionally substituted with halo or alkyl), phenyl (optionally substituted with cyano, nitro, halo, (halo)alkyl, (halo)alkylthio, arylthio, (halo)alkoxy, (halo)alkylcarbonyl, (halo)alkylsulfinyl, (halo)alkylsulfonyl, alkylamino, di(alkyl)amino), H, halo, hydroxyalkyl, alkylthioalkyl, (halo)alkyl, alkyloxyalkyl, alkylsulfinylalkyl, alkylsulfonylalkyl or alkylsulfonyloxyalkyl;or    R4+R5=cycloalkyl;    R6=benzyl (optionally substituted with cyano, nitro, halo, (halo)alkyl, (halo)alkylthio, arylthio, (halo)alkoxy, (halo)alkylcarbonyl, (halo)alkylsulfinyl, (halo)alkylsulfonyl, alkylamino or di(alkyl)amino), H, alkyl, alkoxyalkyl or alkyl(thio)carbonyl;    R7=phenyl (optionally substituted with cyano, nitro, halo, (halo)alkyl, phenyl, phenoxy, (halo)alkylthio, arylthio, (halo)alkoxy, (halo)alkylcarbonyl, (halo)alkylsulfinyl, (halo)alkylsulfonyl, alkylamino or di(alkyl)amino), hetaryl (optionally substituted with cyano, nitro, halo, (halo)alkyl, (halo)alkylthio, arylthio, (halo)alkoxy, (halo)alkylcarbonyl, (halo)alkylsulfinyl, alkylsulfonyl, alkylamino or di(alkyl)amino), naphthyl or quinolyl (both optionally substituted with cyano, nitro, halo, (halo)alkyl, (halo)alkylthio, arylthio, (halo)alkoxy, (halo)alkylcarbonyl, (halo)alkylsulfinyl, alkylsulfonyl, alkylamino or di(alkyl)amino), H, alkyl, alkoxyalkyl or alkyl(thio)carbonyl;    Z'=direct bond, C(O), C(S) or S(O)p;    a=1-3;    p=0-2.    INDEPENDENT CLAIMS are included for the following:    (1) pesticidal composition comprising the aryloazol-2-yl-cyanoethylamine compounds (I) and carrier; and    (2) preparation of the aryloazol-2-yl-cyanoethylamine compounds (I).