中文摘要：

通过对西藏自治区林芝地区色季拉山昆虫的采集调查，发现2个中国新记录种，薄鲁夜蛾（Xestia tenuis（Butler，1889））和缘狭翅夜蛾（Hermonassa marginata Hreblay＆Ronkay，1998）；1个西藏自治区新记录种，赭黄歹夜蛾（Diarsiastictica（Poujade，1887））。对所研究的种类外部形态和外生殖器特征做了描述，并给出了成虫和外生殖器照片及分布。

英文摘要：

Xestia tenuis （Butler, 1889） and Hermonassa marginata Hreblay ＆ Ronkay, 1998 were reported for the first time from China, and Diarsia stictica （Poujade, 1887） new record from Tibet. The adults and genitalia of the species were briefly redescribed and illustrated with their distributions.