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 rufotestaceus Tobias, 1986 Fig. 5A-I Aridelus rufotestaceus Tobias, 1986: 229 (English translation: 399); Chen and van Achterberg 1997 : 18; Shaw et al. 2001 : 132. [Type locality: Russia] Aridelus rufiventris Luo & Chen, 1994: 483; Chen and van Achterberg 1997 :18. Syn. nov. [Type locality: China] Material. Russia 1♀ , holotype , Lazarevskoe , Sochi , forest along rivulet, 14.IX.1981 , V. Tobias leg. (ZISP) . Japan Honshu : 1♂ , Shizuoka Pref. , Shizuoka City , Shimizu Ward , Muramatsu , collected as a host adult of Glaucias subpunctatus on 14.XII.2018 , recognized a cocoon on 23.I.2019 , and emerged on 8.II.2019 , K. Itoyama & A. Tsunashima leg. (OMNH) ; 1♂ , Toyama Pref. , Toyama City , Arimine , Inonedani , 1120 m alt., 15-22.IX.2009 , MsT., M. Watanabe et al. leg. (KPMNH) ; 1♀ , Mie Pref. , Taiki Town , Nishiki , 9-21.X.2007 , MsT., M. Nakaseko leg. (MUNJ) ; 1♂ , Kyoto Pref. , Yawata City , Morigaito , left bank of Kidu River , 17.VI.2018 , S. Fujie leg. (OMNH) ; 1♀ , Nara Pref. , Uda City , Haibarahagihara , Torimiyama-koen , about 585 m alt., 20.VIII.2018 , R. Ito leg. (OMNH). Hachijojima Is . : 2♂♂ , Eigo , 2.VI.1964 , Y, Hirashima & M. Shiga leg. (NARO). Kyushu : 1♂ , Kumamoto Pref. , Izumi Vil. , Gokanoso , 1.VIII.1981 , H. Kurokawa leg. (OMNH). Yakushima Is . : 1♀ , Kankake , 25.VIII-28.IX.2007 , MsT., T. Yamauchi leg. (KPMNH); Mt. Aiko , 8-28.VI.2007 , MsT., T. Yamauchi leg. (KPMNH) ; 1♀ , same data except 29.VII-25.VIII.2007 . (KPMNH) ; 1♀ , same data except 28.IX-2.XI.2007 . (KPMNH) . Korea 1♂ , Kyongsangpuk-do , Mt. Sudo , 700 m alt., 9-12.VII.1971 , K. Yamagishi leg. (MUNJ) . Figure 5. Aridelus rufotestaceus Tobias, 1986, ♀ from Yakushima Is. (A, B, D, F, H) and ♂ from Toyama Prefecture (C, E, G, I) A habitus B, C head, dorsal view D, E head and mesosoma, lateral view F, G second submarginal cell and vein m-cu of fore wing H, I vein 1r-m and 2-SC+R of hind wing. Distribution. Japan ( Honshu : Shizuoka, Toyama, Mie and Kyoto Prefecture; Hachijojima Is.; Kyushu : Kumamoto Prefecture; Yakushima Is.); China, Georgia, Korea, Italy, Russian Far East ( Yu et al. 2016 ; Lee et al. 2017 ). New to Japan. Hosts. Glaucias subpunctatus (Walker, 1867) (a new record) and Nezara viridula (Linnaeus, 1758) ( Shaw et al. 2001 ) (both Pentatomidae ). Remarks. Chen and van Achterberg (1997) indicated the differences between A. rufiventris Luo & Chen and A. rufotestaceus Tobias from only one specimen of each taxon in the sculpture of the vertex, the condition of vein m-cu of the fore wing, the relative length of vein 1r-m of the hind wing, and the colour of the mesosoma, as shown in Suppl. material 1: Table S1. However, these characters could not separate the Japanese specimens into the two species (Suppl. material 1: Table S1). These are most likely intraspecific variations. Hence, A. rufiventris is considered a junior synonym of A. rufotestaceus .