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Eight new species, namely Parancistrocerus latitergus sp. nov. (China), P. lamnulus sp. nov. (China), P. laticlypeus sp. nov. (Thailand), P. prominens sp. nov. (Thailand), P. guangxiensis sp. nov. (China), P. discarinatus sp. nov. (Thailand), P. abyssicavus sp. nov. (Thailand), and P. similiandrocles sp. nov. (China) are described and illustrated. Parancistrocerus samarensis (von Schulthess, 1934) and P. incorruptus incorruptus Giordani Soika, 1972, are newly recorded from China and Thailand, respectively. An updated key to the Oriental species of the genus Parancistrocerus is also given.

The Oriental species of Allorhynchium van der Vecht, 1963 (Hymenoptera: Vespidae: Eumeninae) are keyed for the first time and their distribution is summarised, with special reference to China and Vietnam. Archancistrocerus Giordani Soika, 1986, is synonymized with Allorhynchium van der Vecht (syn. nov.). Allorhynchium diffinis (Giordani Soika, 1986) is a new combination and A. quadrimaculatum Gusenleitner, 1997, is recorded from Vietnam for the first time.