中国厚腹牙甲属(PachysternumMotschulsky)昆虫

The Genus-Pachysternum-Motschulsky of China (Coleoptera: Hydrophilidae: Sphaeridiinae)

报导了我国厚腹牙甲属１新种，即黑厚腹牙甲Ｐａｃｈｙｓｔｅｒｎｕｍｎｉｇｒｉｔｕｍｓｐ．ｎｏｖ．

A new species, Pachysternum nigritum spnovis described. It can be separable from Pnigrovittatus by following characters:① pronotum and elytra black or brownish black without any spot or stripe;② elytra with dense punctures which have short pubescence each one, therefore, the elytra appear coarse;③ anterior tibiae indistinctly waved outsides;④ different aedeagus. The new species resembles P.curvatum d'Orchymont, the differences are:① elytra very coarse and not shining;② anterior tibiae with waved outsides and the rows of marginal spines interrupted;③ the different aedeagus (according to d'Orchymont's description). Holotype: male, Allotype female, Fengkai of Guangdong province, Ⅶ61986. Paratype 39 males and 39 females collected from Guangdong and Guangxi. All types are deposited in Collection of Research Institute of Entomology, Zhongshan University.