To assess intra- and interspecific variation of D. magna, the closely related species D. baiyunshana Zhong & Hua, 2013 was included included in the analysis. Owing to limited sample size of D. baiyunshana males, interspecific analysis of wing variations was conducted only for females. Ten female specimens of D. baiyunshana were collected from Baiyunshan (BYS, 1300 m), Henan Province in 2001. Specimens of D. magna (76 males and 172 females) were collected from four regions in Shaanxi Province from June to August in 2013, including 24 males and 48 females from the Huoditang Forest Farm (HDT, 1500-1800 m), 22 males and 40 females from the Jialingjiang Source Forest Park (JLJ, 1500-1700 m), 8 males and 44 females from Nangongshan National Forest Park (NGS, 1700-1800 m), and 22 males and 40 females from Mt. Taibai (TB, 2300-2500 m). The localities of populations analyzed are marked on the map (Fig. 1).