Harpiphorus, a monotypic genus of subfamily Allantinae (Symphyta: Tenthredinidae), was established based on Tenthredo (Emphytus) lepida Klug. The genus is close to Hemibeleses Takeuchi but can be easily distinguished by the following characteristics: the cell 1M in fore wing with a distinct petiole dorsally and cell M in hind wing closed. Harpiphorus is widely distributed in Europe, but has not yet been found in outside the continent. The larva of this genus is phytophagous attacking the oak species (Quercus trojana Webb and Q. robur L.). As a result of the present study, the genus Harpiphorus is reported based on H. lepidus for the first time from South Korea and the Eastern Palaearctic region. A diagnosis, figures of morphological features are provided.

Monsoma is a small and rarely collected genus within Allantinae, consisting of four species widely distributed in Palaearcticand Nearctic regions: M. faustum Zhelochovtsev, 1961; M. inferentium (Norton, 1868); M. pallipes (Matsumura, 1912);M. pulveratum (Retzius, 1783). This genus is morphologically similar to Empria Lepeletier & Serville, however, can bedistinguished by the abdominal terga without pale detached paired patches, cross-vein m-cu present and cell M closedon the hind wing.In the present study, the genus Monsoma is reported from South Korea for the first time based on M. pallipes. Adetailed redescription, photographs of the diagnostic characters are provided.

Filixungulia, a small genus within the subfamily Allantinae (Symphyta: Tenthredinidae), consists of three species distributed only in Northern China: F. alboclypea Wei, 1997; F. crassitarsata Wei, 1997; F. cylindrica Wei, 2003. It is close to Asiemphytus Malaise and Macremphytus MacGillivray but is separated by the following characteristics: claws simple and very slender; basal lobe and inner tooth absent. Up to date, Filixungulia has not yet been recorded out of China. As a result of the present study, the genus Filixungulia is newly recognized from South Korea with two species, F. alboclypea and F. cylindrica. This discovery extends the range of the genus Filixungulia, which was previously known as a Chinese endemic genus. Also, a key, diagnosis and photographs of each species are provided.

The subfamily Allantinae is one of the large subfamilies within the family Tenthredinidae with about 900 described species in the world. All of the species are worldwide distributed and 322 of them are from Eastern Palaearctic region. Also, in the neighboring countries, it has been recorded that 275 species in China, 90 species in Japan and 131 species in Russia. But only 15 species have been reported in South Korea. Generally subfamily Allantinae can be easily recognized from other subfamilies by the following characters in fore wing: Veins M and Rs+M meeting Sc+R at or very near the same point; vein 2A+3A complete, always separated from 1A by an anal crossvein; veins M and 1m-cu parallel; vein 2r present. Moreover, all larvae of Allantinae are phytophagous and external feeders on the foliage of the host. In this study, we report eight species belonging to the five genera (Allantus, Ametastegia, Apethymus, Asiemphytus and Taxonus) from South Korea for the first time. As a total of 11 genera and 24 species in Allantinae were identified to occur in South Korea. A key, diagnoses and photographs of the diagnostic characters are provided.