Prokofiev A.M. 2018. [On the systematic position of two poorly known south-east Asian genera Metaceraspis Frey, 1962 and Pseudisonychus Frey, 1971 (Coleoptera: Scarabaeidae: Melolonthinae)] // Euroasian Entomological Journal. Vol.17. No.2: 153–156 [in Russian, with English summary].
A.N. Severtsov Institute for Ecology and Evolution, Russian Academy of Sciences, Leninsky prospect 33, Moscow 119071 Russia.
ABSTRACT. Based on study of a part of the type series of the species from the monotypic genera Metaceraspis and Pseudisonychus it is found that first of them should be synonymized with the genus Diphycerus, and its type species M. fukiensis is conspecific with D. tonkinensis (syn.n.). It is also found that the original description of Pseudisonychus vietnamensis contains some errors, and the formerly proposed separation of the genera Pseudisonychus и Langbianella appears to be unjustified. Status of Langbianella is downgraded to subgenus. New combinations Pseudisonychus (Langbianella) auricomes, comb.n. и Pseudisonychus (Pseudisonychus) pterolepis, comb.n. are proposed. Identification keys for the members of Langbianellini and for the species of Diphycerus are given.
KEY WORDS: Diphycerini, Langbianellini, taxonomy, synonymy.