The Australian members of the pantropical coccinellid tribe Serangiini are revised and placed in a single genus Serangium Blackburn with 14 recognized species. Eight new species are described from Australia: S. bellum sp. nov., S. howdenorum sp. nov., S. glorious sp. nov., S. magnum sp. nov., S. monteithi sp. nov., S. nitidum sp. nov., S. sculptum sp. nov. and S. yam sp. nov. The following new synonyms are established: Serangium bicolor Blackburn, 1895 (= S. maculigerum Blackburn, 1892); S. hirtuosum Blackburn, 1892 (= S. mysticum Blackburn, 1889) S. nigrum Lea, 1902 (= S. mysticum Blackburn, 1889); S. maestum Lea, 1902 (= S. mysticum Blackburn, 1889); Serangium punctipenne Lea, 1902 is transferred to Cycloscymnus Blackburn (new combination). Nomenclatural history, diagnoses and distributional information are provided for each species. The world genera of Serangiini are discussed and three valid genera are recognized: Serangium Blackburn, Serangiella Chapin and Delphastus Casey. The remaining three genera are synonymized as follows: Catana Chapin, 1940 and Catanella Miyatake, 1961b with Serangium Blackburn, 1889 (new synonyms) and Microserangium Miyatake, 1961a with Serangiella Chapin, 1940 (new synonym). An updated checklist of the species of Serangium Blackburn and Serangiella Chapin is included.
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