DISCLOSED ARE COMPOUNDS OF FORMULA 1, WHEREIN X IS O OR S; Y IS O OR S; AND R1, R2, R3 AND R4 ARE AS DEFINED IN THE DISCLOSURE. ALSO DISCLOSED ARE COMPOSITIONS CONTAINING THE COMPOUNDS OF FORMULA 1 AND METHODS FOR CONTROLLING AN INVERTEBRATE PEST COMPRISING CONTACTING THE INVERTEBRATE PEST OR ITS ENVIRONMENT WITH A BIOLOGICALLY EFFECTIVE AMOUNT OF A COMPOUND OR A COMPOSITION OF THE INVENTION.