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The Southeast Asian scarab beetle genus Peltonotus Burmeister (Scarabaeidae: Dynastinae) is associated with aroid flowers and possesses a unique, articulated maxillary tooth. We describe five new species of Peltonotus: P. animus and P. cybele from Sumatra, P. favonius from Vietnam, P. mushiyaus from Borneo, and P. tigerus from Thailand. The circumscription of P. karubei Muramoto is broadened to include new color variation, and the body size range for the genus is increased with Peltonotus mushiyaus, n. sp., now being the smallest member of the genus. We provide an amended key to species, distribution maps, diagnoses and accompanying comparative images, and discuss classification of the genus within the Scarabaeidae.