Orientus amurensis Guglielmino, 2005

Orientus amurensis Guglielmino, 2005: 100 .

Orientus ulmeus Li, Song et Yan, 2009: 88 . syn. nov.

Orientus ishidae (Matsumura, 1902) Li, Dai & Xing, 2011: 153 (misidentification).

Material examined. CHINA: 1 Ƌ 5♀♀, Heilongjiang Prov., Nancha, 17 August 1996, coll. Zizhong Li (GUGC) ; 4 ƋƋ 7♀♀, Jilin Prov., Changbaishan, 13-15 August 1996, coll. Zizhong Li (GUGC) ; 1 Ƌ, Inner Mongolia Autonomous Region, Zhalantun, 26 August 1996, coll. Zizhong Li (GUGC); 1 Ƌ, Henan Prov., Hui County, 13 July 2002, coll. Xiangsheng Chen (GUGC); 2 ƋƋ 6♀♀, Shangdong Prov., Shanghe, 9 May 2006, coll. Jiahe Yan (GUGC) ; 2 ƋƋ 7♀♀, Shangdong Prov., Pingyin, 21 July 2007, coll. Shimin Ding (GUGC) ; 2 ƋƋ 2♀♀, Gansu Prov., Zhenyuan, 16 June 2008, coll. Wei Cao (GUGC) ; 1 Ƌ, Henan Prov., Wangwushan, 21 August 2008, coll. Jianda Li (GUGC) ; 2 ƋƋ 2♀♀, Heilongjiang Prov., Mudanfeng, 19 July 2010, coll. Zhihua Fan (GUGC) .

Distribution. China (Liaoning, Heilongjiang, Inner Mongolia, Jilin, Shangdong, Henan, Gansu); Russia (Amur Region, Maritime Territory).

Note. The species O.ishidae can be distinguished from O.amurensis by the pygofer side with a long process on the inner surface, and subgenital plate with a conspicuous and sturdy tooth on the lateral margin near the base of the distal third. Thus, O. amurensis may be identified by the following characters feature: pygofer side with a short process on inner surface; subgenital plate without tooth on lateral margin.