This invention provides compounds of Formula 1, their N-oxides and agriculturally suitable salts wherein R<;SUP>;1<;/SUP>;, R<;SUP>;2<;/SUP>;, R<;SUP>;3<;/SUP>;, R<;SUP>;4a<;/SUP>;, R<;SUP>;4b <;/SUP>;and R<;SUP>;5 <;/SUP>;are as defined in the disclosure. Also disclosed are methods for controlling invertebrate pests comprising contacting the invertebrate pests or their environment with a biologically effective amount of a compound of Formula 1 or a composition comprising a compound of Formula 1.