Diaphorus tridentatus Yang and Saigusa, 2000 Diaphorus tridentatus Yang and Saigusa, 2000, Bull. Inst. Royal Sci. Nat. Belg. Ent. 70: 235. Type locality: Sichuan. Material examined Two males, Taiwan: Kaohsung­hs, Hungshuichi (500m), Liukuei­hsiang, 22. XI. 1997, T. Saigusa. Distribution Sichuan, Taiwan. Trigonocera tongshiensis (Yang, 2002), comb. nov. Diaphorus tongshiensis Yang, 2002. In: Forestry Insects of Hainan: 746. Type locality: Hainan. Comments Male Trigonocera is similar to male Diaphorus, but can be separated from the latter by the elongated and large subtriangular (distinctly longer than wide) first flagellomere with apical or subapical arista. In Diaphorus, the first flagellomere is short and small somewhat round (about as long as wide or wider than long), bearing dorsal or middle dorsal arista. Distribution Hainan. Discussion on the biogeography China belongs faunistically to two zoogeographical realms: the Palaearctic Realm and the Oriental Realm. Seven zoogeographical regions of China are pointed out by Zhang (1998), which are North­East China, North China, Neimeng­Xinjiang, Qinghai­Xizang, South­ West China, Central China and South China Regions. The former 4 regions belong to the Palaearctic Realm, while the latter 3 regions belong to the Oriental Realm. The genus Diaphorus chiefly occurs in the Oriental Realm, with 29 species found there. Only 3 species: D. basiniger, D. hebeiensis, and D. elongatus have been found in the Palaearctic Realm to date. Yunnan Province, which belongs to the South China Region, possesses a number of quite pristine tropical rain forests which are considered to be the largest nature reserves of China. The genus is well represented in the area, to our knowledge, at least 15 species occur there. It indicates that the genus Diaphorus may prefer tropical climates, even though D. elongatus has only been founded in Xinjiang and D. xizangensis in Tibet (= Xizang) so far. The wide distribution pattern of Diaphorus shows its extensive adaptability to the environment. Undoubtedly, the South China Region is the distribution center of the Chinese species because of the abundant species diversity. Acknowledgements We are very grateful to Fasheng Li, Wenquan Zhen and Xingyue Liu (Beijing) for collecting the specimens. We are also grateful to Professor Dawei Huang (Beijing) for his help in many ways. This research is supported by the National Natural Science Foundation of China (No. 30225009)

Published as part of Wang, Mengqing, Yang, Ding & Grootaert, Patrick, 2006, Four new species of the genus Diaphorus (Diptera: Dolichopodidae) from China, pp. 1-20 in Zootaxa 1166 on pages 17-18, DOI: 10.5281/zenodo.2645453