We provide a synopsis of the Sumatran species in the scarab beetle genus Peltonotus Burmeister (Scarabaeidae: Dynastinae: Cyclocephalini), describe a new species of Peltonotus from Sumatra, and describe the male of P. cybele Jameson & Wada from Sumatra (previously known only by the female holotype). To enable identifi cation, we include a key to the fi ve Sumatran species of Peltonotus, comparative images and diagnoses for all species, and temporal and geographical distributions.

Five species of Prioninae from the Indian state of Mizoram were studied: Megobaralipton kalimantanum (Komiya & Makihara, 2001); Nepiodes bowringi (Gahan, 1894); Anomophysis hainana (Gressitt, 1940); Eurypoda (Eurypoda) nigrita Thomson, 1865 and Eurypoda (Neoprion) batesi Gahan, 1894. New country records are provided to: Megobaralipton kalimantanum (Komiya & Makihara, 2001); Anomophysis hainana (Gressitt, 1940); Eurypoda (Eurypoda) nigrita Thomson, 1865; Eurypoda (Neoprion) batesi Gahan, 1894. Nepiodes bowringi (Gahan, 1894) is record for the first time from the Indian state of Mizoram. Detailed taxonomic position of all species, their host plant, and images of dorsal habitus are provided.

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Ceratophyus amdoensis Král & Jákl, new species from Gansu and Qinghai Provinces of China is described, illustrated and compared with its congeners so far known from China and adjacent countries. A key to identification of males of Chinese species of Ceratophyus Fischer von Waldheim, 1824 is provided. Ceratophyus polyceros (Pallas, 1771) is excluded from the fauna of China. First province records of C. dauricus (Jekel, 1866) from Hebei (China) and Hentiy (Mongolia) and first province records of C. sinicus Zunino, 1973 from Hebei, Ningxia and Shaanxi (China) are reported. Distribution of five species so far known from China is summarized and mapped.

A second species of Platygeniops Krikken, 1978 (Scarabaeidae: Cetoniinae: Trichiini: Osmodermatina) is described from the Myanmar-Thai-Malay isthmus and peninsula. The description of Platygeniops elongatus new species is based on two males and a female. The new species is compared with P. exspectans Krikken, 1978 from the Malay Peninsula and Borneo. The genus is re-diagnosed and its enigmatic status is briefly discussed.