Abstract: In 1970s, zhao Xijin and Cheng Zhengwu collected some psittacosaur materials from Early Cretaceous Jiufotang Formation of Meileyingzi, Chaoyang, Liaoning, China (Sereno et al., 1988). Recently, some new psittacosaur materials were discovered from a neighboring area, Sihetun, Beipiao, Liaoning, but from an older lithostratigraphic unit: Yixian Formation. The new material was collected by the local farmer from the black shale of the lower part of Yixian Formation where a diverse fauna, including the famous "feathered" theropod Sinosauropteryx prima (Ji and Ji, 1996), pterosaur Eosipterus yangi (Ji and Ji, 1997), bird Protarchaeopteryx robusta (Ji and Ji, 1997), Confuciusornis sanctus (Hou et al., 1995) and Liaoningornis longiditris (Hou, 1996), and Anura (personal observation), was discovered. The fossil remain is housed in Mr. Liang Shikuan's collections. L is the prefix to the studied fossils of Mr. Liang.

摘要： 根据采自辽宁省北票市四合屯义县组下部的一鸟臀类恐龙新材料的形态学特征，鉴定其为一鹦鹉嘴龙未定种，这是迄今为止产出层位最低的鹅鹉嘴龙材料。鹦鹉嘴龙材料在义县组的发现，对于确定义县组的时代具有一定的意义。