Abstract
Five new species of the genus Chydaeus Chaudoir, 1854 are described from China: Chydaeus fugongensis sp. n. (Shibali, Fugong County, Yunnan Province), Chydaeus gutangensis sp. n. (Gutang, Medog County, Xizang Autonomous Region [Tibet]), Chydaeus hanmiensis sp. n. (Hanmi, Medog County, Xizang Autonomous Region [Tibet]), Chydaeus asetosus sp. n. (NE of Fugong, Yunnan Province), and Chydaeus baoshanensis sp. n. (N of Baoshan, Yunnan Province). Taxonomic and faunistic notes on eleven other species occurring in Xizang and Yunnan are also provided. Chydaeus shunichii Ito, 2006 is re-described, based on specimens from Lushui County, Yunnan. Chydaeus kumei Ito, 1992 is treated as a subspecies of Chydaeus andrewesi Schauberger, 1932 [NEW STATUS]. The taxonomic status of Chydaeus guangxiensis Ito, 2006 is discussed. The following taxa are recorded from China for the first time: Chydaeus obtusicollis Schauberger, 1932 (Xizang and Yunnan), Chydaeus malaisei Kataev & Schmidt, 2006 (Yunnan), Chydaeus semenowi (Tschitschérine, 1899) (Xizang and Yunnan), Chydaeus andrewesi andrewesi Schauberger, 1932 (Xizang and Yunnan), Chydaeus andrewesi kumei Ito (Yunnan), Chydaeus bedeli interjectus Kataev & Schmidt, 2002 (Xizang), and Chydaeus bedeli vietnamensis Kataev & Schmidt, 2002 (Yunnan).
Highlights
Genus Chydaeus Chaudoir, 1854 is a moderately diverse group of anisodactyline species, members of which are distinctly recognizable in having the dentate mentum completely fused with the submentum
The genus includes more than 40 species distributed mainly over mountainous regions of southeastern Asia, from the Himalayas and China to the Sunda Isles; three species are known from New Guinea (Baehr 2007) and one from Australia (Baehr 2004)
Chydaeus species occurring in the Himalayan region were studied by Kataev and Schmidt (2002, 2006), who assigned these species to several species groups based mainly on the male genitalic structure and metacoxal and elytral chaetotaxy
Summary
Genus Chydaeus Chaudoir, 1854 is a moderately diverse group of anisodactyline species, members of which are distinctly recognizable in having the dentate mentum completely fused with the submentum. The single known C. fugongensis male is most similar to those of C. shunichii, differing from them in the following characters: body, the elytra, more elongate, pronotal sides slightly sinuate in basal half, pronotal microsculpture comprised of fine isodiametric meshes basally and laterally and of slightly transverse and nearly effaced meshes on the remaining surface, sternum VII (anal) slightly truncate at apex, median lobe of the aedeagus narrower, less markedly curved ventrad and with a longer terminal lamella, and the internal sac with characteristic armature.
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