A new species of Arbomia Sato & Wang (Lepidoptera, Geometridae, Ennominae) from Guangxi, Southern China.

The genus Arbomia was described as a monotypic genus by Sato & Wang, 2004, based on Arbomia kishidai Sato & Wang, 2004 from China (Guangdong) and Vietnam. Since then, no new species of Arbomia has been described. Recently we have examined all the specimens of Arbomia in IZCAS, including those collected during recent expeditions, and have found one new species. The purpose of this paper is to describe the new species A. trigonoprocessa sp. nov., to reported Arbomia kishidai for the first time from the provinces of Zhejiang, Hunan, Fujian, and Guangxi of China, and to provide diagnostic characters and illustrations of the external features and genitalia of the two Arbomia species. Specimens used in this study are deposited in the Institute of Zoology, Chinese Academy of Sciences, Beijing, China (IZCAS) and the South China Agricultural University, Guangzhou, China (SCAU). Terminology for the genitalia is based on Pierce (1914, reprint 1976), Klots (1970) and Nichols (1989). Photographs of the moths were taken with digital cameras. Composite images were generated using Auto-Montage software version 5.03.0061 (Synoptics Ltd). The plates were compiled using Adobe Photoshop software.