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Abstract
The genus Colasposoma Laporte is shown to be represented in Australia by a single species, C. sellatum Baly (= C. barbatum Harold, syn. conf.; = C. regulare Jacoby, syn. nov.). The adult and larva are described and lectotypes designated for C. sellatum and C. regulare. Colasposoma sellatum is recorded from the Northern Territory, northern Queensland and New Guinea. This species is a pest of Ipomoea batatas (sweet potato) in northern Queensland, where the adults damage stems and foliage and larvae may cause considerable damage to tubers. Its pest status is assessed and control measures discussed.