Taxonomic notes on Stemmops O. Pickard-Cambridge, 1894 (Araneae, Theridiidae) of China

The theridiid spider genus Stemmops O. Pickard-Cambridge, 1894 includes 27 extant species and is distributed in America (23 spp.) and Asia (4 spp.). Three species, S. forcipus Zhu, 1998 (♂♀), S. nigrabdomenus Zhu, 1998 (♂) and S. nipponicus Yaginuma, 1969 (♂♀), are currently known from China.Two new species of Stemmops are described from China: S. atratus sp. n. (♀, Jiangsu, Zhejiang) and S. lini sp. n. (♂♀, Fujian, Zhejiang). In addition, the previously unknown female of S. nigrabdomenus Zhu, 1998 is described. Photos and morphological descriptions are provided.