First record of the genus Chorinaeus Holmgren, 1858 (Hymenoptera: Ichneumonidae) from India and Thailand with the description of two new species Author Ranjith, A. P. 0000-0001-7061-9659 Integrative Insect Ecology Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand ridhuranjith@gmail.com Author Butcher, Buntika A. 0000-0002-0541-0709 Integrative Insect Ecology Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand buntika.a@chula.ac.th text Zootaxa 2024 2024-06-05 5463 2 283 290 http://dx.doi.org/10.11646/zootaxa.5463.2.8 journal article 10.11646/zootaxa.5463.2.8 1175-5326 11611067 4DEA8F13-0BC8-4A6C-9C7F-803F04F8772D Chorinaeus amrithae Ranjith & Butcher sp. nov. http://zoobank.org/ urn:lsid:zoobank.org:act: 2661C595-3C03-48EB-AB99-DB67A812C7D2 ( Figs 1–2 ) Material examined . Holotype , female, Thailand : Nan Province , Doi Phu Kha National Park ; 19°12.236’ N , 101°04.667’ E , altitude 1,341 m .a.s.l. 10.iii.2023 , Malaise trap , coll. Worapong Atsawasiramanee ( CUMZ ) . Paratype , 1 male , INDIA : Karnataka , Chamarajanagar , Biligiri Ranga Biligiri Rangaswamy Temple Tiger Reserve, Vellachy Metty , 14–30.x.2005 , Malaise trap , coll. D.R. Priyadarsanan ( AIMB ) . Description . Female. Body length 7.1 mm , length of fore wing 4.8 mm . Head . Head transverse in dorsal view, not narrowed posteriorly behind eyes, 2.1 × as wide as long medially ( Fig. 1C ), 1.2 × as wide as long medially in anterior view ( Fig. 1B ); frons smooth, setose laterally ( Fig. 1C ); occiput smooth, glabrous medially rest setose ( Fig. 1C ); temple smooth dorsally, setose, not convex, 0.7 × as long as transverse diameter of eye in lateral view ( Fig. 1E ). Occipital carina present ( Figs 1C, E ). Eyes glabrous, slightly emarginated at the level of antennal sockets ( Fig. 1B ). Distance from lateral ocellus to eye 1.0 × diameter of ocellus. Distance between lateral ocellus 1.6 × distance from lateral ocellus to eye. Face not convex in lateral view, 1.3 × wider than long in anterior view, parallel sided, slightly widened posteriorly, smooth, punctate, setose ( Fig. 1B ). Clypeal sulcus not impressed ( Fig. 1B ). Clypeus punctate, setose, slightly emarginated medio-posteriorly ( Fig. 1B ). Length of malar space equal to basal width of mandible. Mandible bidentate with longer and wider upper tooth, lower tooth acute ( Fig. 1D ). Antennae with 35 flagellomeres; all flagellomeres as long as wide except first and apical flagellomeres; first flagellomere 1.6 × as long as maximum width, 1.5 × as long as second flagellomere, apical flagellomere 2.2 × as long as wide. FIGURE 1. Chorinaeus amrithae Ranjith & Butcher sp. nov. , holotype, female A) habitus, lateral view; B) head, anterior view; C) head, dorsal view; D) head, antero-ventral view; E) head and mesosoma, lateral view; F) mesosoma, dorsal view. FIGURE 2. Chorinaeus amrithae Ranjith & Butcher sp. nov. , holotype, female A) scutellum and propodeum, dorsal view; B) propodeum and first metasomal tergite, dorso-lateral view; C) metasoma, lateral view; D) metasoma, dorsal view, E) fore wing. Mesosoma . Mesosoma 1.5 × as long as high; mesoscutum smooth with a short midlongitudinal groove subposteriorly, densely setose, without notauli, sides of mesoscutum with shallow groove ( Fig. 1F ). Scuto-scutellar groove narrowly crenulate ( Fig. 1F ). Scutellum distinctly wider than long, lateral margin parallel sided, smooth, densely setose, sparsely punctate with distinct lateral carina extend till posterior margin ( Figs 1F , 2A ). Mesopleuron smooth, setose, speculum glabrous ( Fig. 1E ). Epicnemial carina distinct, reaching anterior margin of mesopleuron ( Fig. 1E ). Propodeum faintly rugose antero-laterally, setose with parallel longitudinal dorsal carinae, anterior transverse carina absent, posterior transverse carina present laterally, medial sections of anterior and posterior transverse carina absent ( Fig. 2A ); spiracles elongate, elliptical, connected with pleural carina ( Fig. 2B ). Metapleuron smooth, setose, glabrous medially, with a few short longitudinal rugae ventrally, juxtacoxal carina interrupted medially ( Fig. 1E ). Fore wing 3.1 × as long as wide. Fore wing vein 1cu-a postfurcal ( Fig. 2E ). Hind femur 2.8 × as long as its maximum width in lateral view. Hind tibia 3.7 × as long as its maximum width. Ratio of length of hind tarsomeres 1–5, 4.5: 1.5: 1.3: 1.0: 1.4. Metasoma . Metasoma coarsely and densely punctate-rugose ( Figs 2C, D ). First metasomal tergite smooth anterior half, rugose posterior half, 0.9 × as long as apical width, with distinct dorso-lateral, ventro-lateral and pair of latero-median carinae ( Figs 2B–D ). Second metasomal tergite 0.6 × as long as its apical width, with distinct dorso-lateral carina till spiracle and latero-median carinae distinct at anterior half ( Figs 2B–D ). Third metasomal tergite 0.6 × as long as its apical width, with midlongitudinal carinae distinct basally ( Fig. 2D ). Ovipositor sheath setose apically ( Fig. 2C ). Color . Body black; scape ventrally, face except medially, clypeus postero-laterally, maxillary and labial palps, frons laterally, tegula, all femora basally and apically, all tibia basally, and tibial spur yellow; mandible subapically, antennal flagellomere, fore femur except apically, wing veins, ovipositor and ovipositor sheath brown. Male . Same as female except 34 flagellomeres, scuto-scutellar groove widely crenulate medially and laterally. Distribution . India and Thailand . Biology . Unknown. Etymology . APR dedicates this species to his friend Ms Amritha Jaiprekash Kurup, for her outstanding support and encouragements, and especially her strong desire to start taxonomic research. Comparative diagnosis . The new species, C. amrithae is comes close to C. aizanensis described from Japan based on the color of the head. Apart from the differences cited in the key the new species differs from C. aizanensis by having the following differences; mid coxa black (yellow in C. aizanensis ), mid femur black with yellow apex (yellow in C. aizanensis ), and propodeal spiracle long, elliptic (small and oval in C. aizanensis ).