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The Palaearctic species of Ismaridae Thomson, 1858 are reviewed. Thirteen species of Ismaridae are recognized from the Palaearctic. Five species are described as new: Ismarus brevis Kim & Lee sp. nov. from the Russian Far East and South Korea; I. distinctus Kim, Notton & Ødegaard sp. nov. from Norway and the United Kingdom; I. excavatus Kim & Lee sp. nov. from China, Japan and South Korea; I. similis Kim, Notton & Lee sp. nov. from the United Kingdom and I. tripotini Kim & Lee sp. nov. from South Korea. Ismarus apicalis Kolyada & Chemyreva, 2016 is newly recorded from China, France, Japan and South Korea; I. dorsiger (Haliday, 1831) from France, Montenegro, Norway, South Korea and Switzerland; I. flavicornis (Thomson, 1858) from Bulgaria and Norway; I. grandis Alekseev, 1978, I. halidayi Förster, 1850 and I. multiporus Kolyada & Chemyreva from Japan and South Korea; I. rugulosus Förster, 1850 from Austria and I. spinalis Kolyada & Chemyreva, 2016 from China, Japan and South Korea. An identification key to all species found in the Palaearctic region is presented.
Species of the genus Aphelopus Dalman (Hymenoptera, Dryinidae) are important natural enemies of leafhoppers. The genus is relatively diverse in China, with 35 recorded species. In order to further make use of these important parasitoids in biological control programs, species of Aphelopus collected across China are studied using an integrative approach (combined DNA barcoding and morphology). Of the 17 studied species, two are newly recorded from China: A. nivealis Mita & Olmi, 2014 and A. prolatus Mita & Olmi, 2014, and four are described as new to science: A. incognitus Chen, Olmi & Guglielmino sp. nov., A. maculiala Olmi, Chen & Ødegaard sp. nov., A. taianensis Olmi, Ødegaard & Chen sp. nov., and A. zaifui Olmi, Chen & Liu sp. nov. The total number of Aphelopus species known from China is raised from 35 to 39. Keys to the Oriental and Eastern Palaearctic species of Aphelopus are modified to include the new species. Application of DNA barcoding in the species delimitation of Dryinidae is discussed.