The genus Aridelus Marshall (Hymenoptera, Braconidae, Euphorinae) from Japan, with description of a new species Author Fujie, Shunpei https://orcid.org/0000-0002-1624-964X Osaka Museum of Natural History, Nagaikoen 1 - 23, Higashisumiyoshi, Osaka 546 - 0034, Japan shunpei.fujie@gmail.com Author Maeto, Kaoru Laboratory of Insect Biodiversity and Ecosystem Science, Graduate School of Agricultural Science, Kobe University, Rokkodaicho 1 - 1, Nada, Kobe, Hyogo 657 - 8501, Japan text ZooKeys 2022 2022-04-06 1092 105 122 http://dx.doi.org/10.3897/zookeys.1092.73299 journal article http://dx.doi.org/10.3897/zookeys.1092.73299 1313-2970-1092-105 85ACA852BA574845B15594B08C028559 CE6BAB58C80E54DB9F2DC4F1F5CC33C4 Aridelus flavicans Chao, 1974 Fig. 4A-F Aridelus flavicans Chao, 1974: 455; Chou 1987 : 23; Luo and Chen 1994 : 484; Chen and van Achterberg 1997 : 16. [Type locality: China] Aridelus guizhouensis Luo, 1985: 203. Syn. by Luo and Chen 1994 . [Type locality: China] Material. Japan Honshu : 1♀ , Aomori Pref. , Aomori City , Yokouchi-Yaegiku , 11.IX.1993 , T. Ichita leg. (NARO) ; 1♂ , Tokyo Pref. , Hachioji City , Minamiosawa , Tokyo Metropolitan University , 10.VIII.2010 , N. Kikuchi leg. (OMNH) ; 1♀ , Kyoto Pref. , Yawata City , Yawatahayashinomoto , collected as a host larva of Homoeocerus unipunctatus feeding on Pueraria lobata on 12.VII.2021 , cocoon formed on 23.VII.2021 , and emerged on 29.VII.2021 , S. Fujie leg. (OMNH) ; 2♀♀ , Nara Pref. , Yamatokoriyama City , Yamadacho , Nara-gakuen , 8.VII.2017 , R. Ito leg. (OMNH) ; 1♀ , Nara Pref. , Yamatokoriyama City , Yamadacho , 6.IX.2016 , R. Ito leg. (OMNH) ; 3♀♀ , Nara Pref. , Yamatokoriyama City , Yamadacho , Yata-kyuryo , about 135 m alt., 8.IX.2018 , R. Ito leg. (OMNH) ; 1♀ , same data except 13.IX.2018 (OMNH) ; 1♀ , Nara Pref. , Uda City , Haibarahagihara , Torimiyama-koen , about 585 m alt., 20.VIII.2018 , R. Ito leg. (OMNH) ; 1♀ , Osaka Pref. , Takatsuki City , Settsukyo , 24.IX.2017 , S. Fujie leg. (OMNH) ; 6♀♀ and 1♂ , Osaka Pref. , Habikino City , Shakudo , 3.VIII.2020 , S. Fujie leg. (OMNH) ; 2♂♂ , same data except 22.VIII.2020 (OMNH) ; 2♀♀ , same data except 2.VIII.2021 (OMNH) ; 1♀ , Hyogo Pref. , Kawanishi City , collected as a host adult of Riptortus clavatus feeding on Phaseolus vulgaris on 24.VIII.2011 , cocoon formed on 13.IX.2011 , and emerged on 27.IX.2011 , I. Hikino leg. (NARO) ; 1♂ , same locality, host, collector and date of cocoon formation, collected on 29.VIII.2011 and emerged on 27.IX.2011 (NARO) ; 1♂ , same locality, host, collector and date of cocoon formation, collected on 31.VIII.2011 and emerged on 28.IX.2011 (NARO) ; 1♀ , Hyogo Pref. , Kobe City , Nada Ward , Nadamaruyama Park , 23.VI.2019 , M. & S. Fujie leg. (OMNH) ; 1♀ , Hyogo Pref. , Asago City , Tataragi , 185 m alt., 30.VII. 2016 , T. Tokuhira leg. (KPMNH) ; 1♀ , Tottori Pref. , Inaba Prov. , Ketaka , Tsuyutani , alt. 20 m , 8.VIII.1964 , H. Aoki leg. (OMNH) ; 1♀ , Hiroshima Pref. , Tojo Town , Taishaku , 9.VIII.1978 , K. Maeto leg. (NARO) . Kyushu : 1♀ , Fukuoka Pref. , Mt. Tachibana , 22.IX.1979 , K. Maeto leg. (NARO) ; 1♀ , Oita Pref. , Mt. Sobo , 800-900 m alt., 22.VII.1978 , K. Maeto leg. (NARO) ; 1♀ , Oita Pref. , Yufuin Town , Shimoyunohira , 1.IX.1991 , M. Hiratate leg. (NARO) . Figure 4. Aridelus flavicans Chao, 1974, ♀ from Tokyo Prefecture (except for D from Osaka Prefecture ), Japan A habitus B head, frontal view C head, dorsal view D apical part of antennae E mesoscutum and scutellum, dorsal view F metasoma, dorsal view. Distribution. Japan ( Honshu : Aomori, Tokyo , Nara, Osaka , Hyogo , Tottori and Hiroshima Prefectures; Kyushu : Fukuoka and Oita Prefecture) ( Konishi and Maeto 2000 ; present study); China, Russian Far East, Taiwan ( Yu et al. 2016 ). Hosts. Homoeocerus unipunctatus (Thunberg, 1783) ( Alydidae ) feeding on Pueraria lobata ( Fabaceae ) and Riptortus pedestris (Linnaeus, 1758) ( Alydidae ) on Phaseolus vulgaris ( Fabaceae ) (both new records). The family Alydidae is the first record of the host of the genus Aridelus . Remarks. The female specimens examined agree well with the redescription by Chou (1987) and that in the key by Chen and van Achterberg (1997) ; they differ slightly by having the body length 4.1-5.3 mm (4.2-5.1 mm in the previous redescriptions) and the penultimate antennal segment 1.1-1.6 x longer than wide (1.2-1.6 x in the redescriptions).