Taxonomic revision of the genus Loboscelidia Westwood, 1874 (Hymenoptera: Chrysididae: Loboscelidiinae) from Vietnam Author Hisasue, Yu D2E20D5E-B406-4169-9B1D-A4D0078D06EE Entomological Laboratory, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka, Fukuoka, 819 - 0395, Japan. & Ogasawara Division of Japan Wildlife Research Center, Okumura, Chichijima, Ogasawara, Tokyo 100 - 2101, Japan. hybrizonist@gmail.com Author Pham, Thai-Hong B226B19B-509B-4878-B2FD-8505B688A1D2 Mientrung Institute for Scientific Research, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology (VAST), 321 Huynh Thuc Khang, Hue, Vietnam. & Graduate School of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam. phamthai@vnmn.vast.vn Author Mita, Toshiharu 6CC49F2C-C91C-463C-9C2D-8269588E1A6A Entomological Laboratory, Faculty of Agriculture, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka, 819 - 0395 Japan. t3mita@agr.kyushu-u.ac.jp text European Journal of Taxonomy 2023 2023-08-04 887 1 1 68 http://zoobank.org/788ae14a-0698-4c42-819c-bc2412f76fca journal article 60724 10.5852/ejt.2023.887.2203 e07425be-9a2c-4459-aa8b-b51c90eafc0f 2118-9773 8222523 788AE14A-0698-4C42-819C-BC2412F76FCA Loboscelidia mediata sp. nov. urn:lsid:zoobank.org:act: 6A304EBB-F336-4F03-99F8-5CB598F9DF78 Figs 2D , 17 , 25L Etymology Named after the Latin ‘ mediata ’, meaning ‘oblique’, referring to the unusual and deviant morphological characteristics of the genus Loboscelidia . Type material Holotype VIETNAM • ♂ ; Kon Tum Province , Chu Mom Ray NP , Bar Goc Station ; 14.434° N , 107.720° E ; 31 Apr.–4 May 2014 ; H.T. Pham ; MT ; VNMN . Description Male ( Fig. 17A ) MEASUREMENTS . Body length 2.6 mm ; forewing length 2.6 mm . HEAD . Head ( Fig. 17B–D ) 1.7 times as long as high, 1.2 times as long as wide; inner ocular length 0.68 times as long as head width; frontal projection rectangular in frontal view ( Fig. 17B ); apical margion of frontal projection depressed ( Fig. 17C ); frons polished, with longitudinal striae ( Fig. 17C ); frons without ridge along inner orbit of eye ( Fig. 17C ); spraclypeal area with transverse carinae ( Fig. 17B ); temple 3.2 times as long as MOD ( Fig. 17C ); POL 1.7 times as long as MOD; OOL 2.4 times as long as MOD; LOL 0.57 times as long as MOD; behind ocelli with transverse depression ( Fig. 17C ); cervical expansion strongly convex in lateral view ( Fig. 17D ); basal part of cervical expansion strongly constricted in dorsal view ( Fig. 17C ); scape 4.4 times as long as wide; scape without longitudinal grooves; scape without transparent flange; F1 2.2 times as long as wide; F2 2.3 times as long as wide; F11 2.3 times as long as wide; relative length of F1–F11: 1.7: 1.4: 1.2: 1.2: 1.0: 1.0: 1.0: 1.0: 1.0: 1.0: 2.3. Fig. 17. Loboscelidia mediata sp. nov. , holotype, ♂ (VNMN). A . Lateral habitus. B . Head , dorsal view. C . Head , frontal view. D . Head , lateral view. E . Pronotum, dorsal view. F . Mesosoma, dorsal view. G . Forewing. Scale bars: A, D–G = 0.5 mm; B–C = 0.2 mm. MESOSOMA . Pronotum 0.95 times as long as posterior width of pronotum ( Fig. 17E ); posterior width of pronotum 1.4 times as wide as anterior width and 0. 80 times as wide as head width; dorsolateral surface of pronotum rounded ( Fig. 17A ); notauli of scutum straight, reaching posterior margin ( Fig. 17F ); scutellum polished ( Fig. 17F ); apico-lateral area of scutellum with longitudinal grooves ( Fig. 17F ); metanotum with two ridges; scrobal sulcus absent ( Fig. 17A ); metanotum 0.42 times as long as scutellum ( Fig. 17F ); propodeal angle weakly developed; propodeum without transverse carina above foramen. WINGS . Forewing ( Fig. 17G ) with M curved; cu-a absent; A absent; R1 0.29 times as long as R; Rs 2.3 times as long as R. LEGS . Tibiae smooth, without flanges; flange on forefemur 0.18 times longer, 0.60 times wider than tubular part of forefemur; flange on midfemur 0.16 times longer, 0.33 times wider than tubular part of midfemur; hindcoxa 2.3 times as long as hind trochanter; hindcoxa dorso-laterally carinate; basal part of hindfemur simple; hindfemur basally not stout, as wide as distal part; ventral margin of hindfemur swollen; outer surface of hindfemur smooth; flange on hindfemur 0.20 times longer, 0.60 times wider than tubular part of hindfemur; tarsal claw of hindtibia with one tooth and not extending half of tarsal claw ( Fig. 25L ). PILOSITY . Scape with sparse suberect cuneate and forked setae ( Fig. 17B ); pedicel with sparse suberect cuneate setae; gena and frontal projection with separate ribbon-like setae; dorsal rurface of pronotum with sparse suberect and erect forked setae ( Fig. 17E ); dorso-frontal margin of pronotum with short ribbon-like setae; lateral surface of pronotum with sparse suberect and erect forked setae; propleuron with sparse suberect and erect forked setae; scutum with sparse suberect and erect forked setae ( Fig. 17F ); mesopleuron with sparse suberect and erect forked setae; tegula with sparse suberect and erect forked setae; scutellum with dense suberect forked setae; forecoxa with sparse decumbent simple and cuneate setae; foretrochanter with sparse suberect simple setae; midcoxa with sparse decumbent cuneate setae; midtrochanter with sparse suberect simple setae; hindcoxa with sparse decumbent cuneate setae; hindtrochanter with sparse decumbent cuneate setae. COLORATION . Body reddish brown; antenna reddish brown; legs reddish brown; flanges yellowish brown; ribbon-like setae whitish yellow. Female Unknown. Distribution Vietnam (Central Vietnam ) ( Fig. 28 ). Remarks This species can be easily distinguished from other species by the shorter ribbon-like setae and forked setae, similar to another genus Rhadinoscelidia . We assigned this new species to Loboscelidia because it has the developed wing venation; however, other characteristics (e.g., long scape with dense erect or suberect setae; cervical expansion with shorter ribbon-like setae; pronotum with forked erect setae; and tibiae without flanges) are rather similar to those of Rhadinoscelida .