Monoctonus sichuanicus Davidian & Belokobylskij 2025, sp. nov.

Monoctonus sichuanicus Davidian, sp. nov. http://zoobank.org/ 0C27AD1E-E09F-4D3F-858F-020ADDDFFF01 Fig. 2 Type material. Holotype: female, China, Sichuan, Jiuzhaigоu County, N of Dajisi Village, 33 23ʹ32ʺ N, 103 48ʹ11ʺ E, h = 4205 m, 23.VI.2012 (I. Belousov, G. Davidian) (ZISP). Description. Female. Body length 2.3 mm; length of antenna 1.6 mm; length of fore wing 2.4 mm. Head smooth, shining, with sparse setae, wider than mesosoma at level of tegulae. Eyes large, widely oval, with sparse short setae in its lower half, below converging to clypeus. Face subsquare, its width almost equal to height. Malar space 0.8 × height of eye. Eye in dorsal view 2.0 × longer than temple. Clypeus width 1.8 × its medial height. Tentorial index = 0.3. POL 2.0 × Od. Maxillary palp with 4 segments, labial palp with 3 segments. Antenna filiform, with 16 antennomeres, covered by long semi-erect setae, these setae about as long as width of basal flagellomeres. Length of F1 5.5 × its width in middle; length of F2 5.0 × its width in middle. F1 without rhinaria, F2 with one rhinaria (lateral view). Mesosoma. Mesoscutum with distinct notauli only in anterior one third. Propodeum without closed areola delineated by carinae, in posterior half only with two divergent anteriorly carinae. Wings. Fore wing with closed central cell. Pterostigma about 7.3 × longer than its maximum width and 3.0 × longer than metacarp (1-R1). First abscissa of radial vein (r) 0.6 × as long as metacarp (1-R1), second abscissa (3-SR) 1.2 × longer than metacarp (1-R1). First radiomedial vein (2-SR) strongly desclerotised near recurrent vein (m-cu). Metasoma. Petiole rugose, with distinctly protruding spiracular tubercles, length of petiole 2.5 × its width at level of spiracles. Ovipositor sheath plow-shape, narrowly subtriangular basally, obtuse apically. Length of sheath 2.6 × its maximum width and 7.0 × its apical width. Colour. Head, metasoma and sheath brown, antenna and mesosoma pale brown, clypeus, mouthparts, legs and petiole yellowish. Male. Unknown. Hosts. Unknown. Bionomics. Specimen was collected by shaking the bush Dasiphora fruticosa (L.) O. Schwarz (Rosaceae). Etymology. Named after Sichuan Province of China, where specimen of this new species was collected. Comparative diagnosis. The new species has diverging anteriorly carinae on posterior half of propodeum and thus resembles Monoctonus hispanicus Tizado, 1992, parasitoid of aphid Nasonovia (Neokakimia) sp. on Saxifraga clusii Gouan (Tizado 1992). However, it differs from the latter by the number of antennomeres (16) (in M. hispanicus antenna with 11 antennomeres). Monoctonus sichuanicus sp. nov. differs also from other species of the M. nervosus species group by the absence of the closed central areola on propodeum. The differences of this new species with M. genriki sp. nov. are shown after description of latter species.