Arria muscoamicta Unnahachote & Shcherbakov, sp. nov. is described based on a male from central Thailand. This is the first record of Arria Stål, 1877 from the country. The new species is closely allied to A. leigongshanensis (Ge & Shen, 2008) from China, differing by the absence of prozonal tubercles, the elongated pronotum, nine tibial anteroventral spines, and the truncated hindwings. The new species is a moss-camouflaging mantis living at high altitude. The taxonomic problems of the genus are briefly discussed.
A new species, Euchomenella kasetsart sp. n., is described based on the male and female collected from Nakhon Pathom Province, central Thailand. The new species can be easily distinguished from other Oriental congeners by the smaller pronotal proportion.
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