Gastroserica (Gastroserica) marginalis (Brenske, 1894)

Material examined. 1 ♂ “N-Vietnam Haiphong Cat Ba Island, vic. Cat Ba NP, 23.IV.2012 20°24’55’N, 106°60’E 190m leg. A. Weigel ” (NME) , 1 ♂ “N-Vietnam, Cao Bang Pr. Vic. Tinh Tuc, Pia Oac Top, Nui Pia Oac Nature Res. 22°36’50’’N, 105°53’20’’E 13.V.2014, 1400–1800 m leg. A. Weigel ” (NME) , 1 ♂ “N-Vietnam, Cao Bang Pr., Nguyen Binh Dis., Phia Oac-Phia Den N.P., light trap, 20.v.2020, 22°37’41’’N, 105°54’41’’E, 857 m leg. T.V. Hoang & P.V. Pham ” (IEBR) .