Taxonomic notes on the genus Orthobrachia Warren, with description of a new species from China and Thailand (Lepidoptera, Geometridae)

All seven members of the genus Orthobrachia Warren, 1895 are recorded, with description of a new species from Sichuan Province, China and N. Thailand, including Orthobrachia latifasciata (Moore, 1888) and Orthobrachia flavidior (Hampson, 1898) from northern India, Nepal and China, Orthobrachia tenebrosa Yazaki, 1992 from Nepal and India, Orthobrachia owadai Yazaki, 1992 from India, Orthobrachia simpliciata Yazaki, 2002 from China, and Orthobrachia maoershanensis Huang, Xin & Wang, 2003 from South China. A key to the Orthobrachia species is provided, along with a distributional map of all nominal species. The type specimens of the new species are deposited in Hunan Agricultural University (China), South China Agricultural University (China) and Zoological Research Museum Alexander Koenig (Germany).