Aeshnidae of Guangdong and Hong Kong (China), with the descriptions of three new Planaeschna species (Anisoptera)

Taxonomic information is provided on the Chinese aeshnid fauna from Guangdong and Hong Kong, based on surveys completed from 1998 to 2005. Planaeschna haui sp. n. (holotype: 6, Shimentai, Guangdong), P. nanlingensis sp. n. (holotype: S, Nanling, Guangdong) and P. skiaperipola sp. n. (holotype: 6, Shimentai, Guangdong) are described. Periaeschna rotunda Wilson is synonymised with Cephalaeschna klotsi Asahina. Petaliaeschna gerrhon Wilson is combined with the genus Periaeschna Martin and the first $ described. Boyeria karube Yokoi is newly recorded from China. Keys are provided for the determination of Oriental Brachytronini genera and identification of Chinese spp. of S Cephalaeschna Selys, Periaeschna Martin and Petaliaeschna Fraser. A total of 25 aeshnids are recorded from Guangdong, including 3 new spp., and 3 new provincial records. 12 aeshnids are recorded from Hong Kong, including Planaeschna skiaperipola sp. n. (paratype: 9, Wu Kau Tang, Hong Kong).