Amphibulus rufithorax Sheng, Li & Yang, 2023

Li, Tao, Yang, Zai-Hua, Sun, Shu-Ping & Sheng, Mao-Ling, 2023, Three new species of Amphibulus Kriechbaumer (Hymenoptera, Ichneumonidae, Phygadeuontinae) from China with a key to species known from the Oriental and Eastern Palaearctic Regions, Journal of Hymenoptera Research 96, pp. 847-862 : 847

Amphibulus rufithorax Sheng, Li & Yang sp. nov.

Figs 7 , 8

Diagnosis.

Frons (Fig. 8A ) with coarse dense punctures. Fore wing (Fig. 7A ) vein 1cu-a distinctly distal to M&RS; areolet receiving vein 2m-cu approximately at its middle. Lateral carinae of area basalis (Fig. 8D ) mostly vestigial. Area superomedia almost as wide as long, receiving costula at anterior 0.3. First sternite reaching level of spiracle. Head and tergites 2-6 almost entirely black; First tergite predominantly black. Mesosoma reddish brown.

Description.

Female. Body length 4.9-6.7 mm. Fore wing length 4.1-5.1 mm. Ovipositor sheath length 1.1-1.2 mm.

Head. Face (Fig. 7B ) 2.3 × as wide as long, evenly convex medially, dense punctures and irregular indistinct longitudinal wrinkles medially; lateral side smooth, sparsely punctate. Anterior tentorial pit relatively large, obliquely elliptic. Median point of clypeal sulcus above level of line reaching lower margins of eyes. Clypeus smooth, shiny, 2.9 × as wide as long, evenly convex apically; with sparse fine punctures; apical margin weakly arched forward. Mandible with dense fine punctures; upper tooth 3.0 × as long as lower tooth. Malar space 0.6 × as long as basal width of mandible. Gena in dorsal view 0.62-0.65 × as long as width of eye, evenly slightly convergent backwardly, with irregular punctures, distance between punctures 0.5 to 3.0 × their diameter. Vertex (Fig. 7C ) with sparse punctures and long brown setae. Stemmaticum with relatively dense punctures. Postocellar line 0.7 × as long as ocular-ocellar line. Frons (Fig. 8A ) with dense punctures, distance between punctures at most 0.5 × their diameter, lateral sparser than median portion. Antenna with 23-25 flagellomeres. Flagellomeres 11 to 23 (26) slightly flattened in ventral view. Ratios of lengths from first to fifth flagellomeres: 5.5:6.1:5.7:5.5:5.2. Occipital carina complete, reaching hypostomal carina at base of mandible.

Mesosoma. Pronotum (Fig. 8C ) almost shiny, with indistinct fine punctures; lower portion with indistinct fine oblique wrinkles. Epomia long, lower end almost reaching to lower-anterior margin of pronotum, dorsal end almost reaching dorsal margin. Mesoscutum (Fig. 8B ) shiny, lateral and anterior portions almost smooth, with shallow punctures; posteromedian portion with short irregular longitudinal wrinkles and fine punctures. Anterior end of notaulus distinct. Scutoscutellar groove deep, with distinct longitudinal wrinkles. Scutellum shiny, almost smooth, with few punctures; lateral carina present anteriorly. Postscutellum smooth, shiny, with deep antero-lateral pits. Anterior and lower portions of mesopleuron (Fig. 8C ) with dense punctures and setae, dorsal posterior shiny, with sparse fine punctures. Speculum small, indistinct. Dorsal end of epicnemial carina almost reaching to 0.5 distance to subtegular ridge. Metapleuron (Fig. 8C ) weakly convex, with dense setae and relatively sparse fine punctures. Median portion of juxtacoxal carina vestigial. Anterior portion of submetapleural carina strongly lobe-shaped convex. Ratio of length of hind tarsomeres from first to fifth: 5.8:2.2:1.6:1.0:1.8. Wings slightly gray, hyaline; vein 1cu-a distinctly distal to M&RS. Areolet pentagonal, lateral veins strongly convergent forwardly, receiving vein 2m-cu approximately at its middle. Postnervulus intercepted at lower 0.3. Hind wing vein 1-cu strongly inclivous, 3.0 × as long as cu-a. Propodeum (Fig. 8D ) smooth, shiny, indistinctly punctate peripherally, completely areolated. Apophysis indistinct. Area basalis reversed trapezoidal, lateral carina mostly vestigial. Area superomedia hexagonal, maximum width slightly wider than its length, reaching costula at anterior 0.35. Propodeal spiracle elongate, approximate 1.4 × as long as wide.

Metasoma. First tergite (Fig. 8E, F ) approximately 3.0 × as long as posterior width, smooth, shiny, with very sparse punctures; posterior half evenly widened posteriorly. Postpetiole approximately as long as its width. Latero-median carina indistinct; dorso-lateral and ventro-lateral carinae weak, complete. First sternite reaching level of spiracle. Spiracle circular, small, located approximately at posterior 0.4 of first tergite. Tergites 2-3 (Fig. 8G ) almost smooth, shiny. Second tergite 0.6 × as long as posterior width, with sparse indistinct fine punctures. Third tergite approximately 0.5 × as long as maximum width, slightly convergent posteriorly. Remainder tergites with fine punctures and distinct setae. Ovipositor sheath 0.8 × as long as hind tibia. Ovipositor (Fig. 8H ) compressed, with indistinct subapical nodus and weak notch; ventral valve with two indistinct teeth.

Coloration (Fig. 7A ). Head black; ventral profiles of scape and pedicel, mandible, maxillary and labial palpi yellowish brown; flagellomeres 7-11 white dorsally. Mesosoma almost entirely red brown. Fore and middle legs dark brown, except coxae and trochanters, fore femur apically and tibia whitish yellow. Hind coxa predominantly, trochanter, femur (apex black) darkish red, subbase of tibia brownish yellow. Posterior half of first tergite irregularly brown. Tergites 2-6 black, apical margins narrowly yellow. Tergites 7-8 white medially, black brown laterally. Wing veins brownish black; Pterostigma brown medially.

Male. Unknown.

Etymology.

The specific name is derived from the mesosoma being entirely red brown.

Material examined.

Holotype. China • ♀; Guizhou Province, Fanjingshan National Natural Reserve, Yapanlin ; 1250 m; 15 May 2019; IT by Mao-Fei Tian; CBDPC.

Paratypes. China • 2 ♀♀; same data as holotype except: Lengjiaba ; 840 m; 14 to 21 October 2019; IT by Zheng-Hai Yang; CBDPC • 1 ♀; same data as holotype; CBDPC • 8 ♀♀; Guizhou Province, Leigongshan National Natural Reserve ; 1760 m; 17 June to 6 August 2019; IT by Wan-Xin Pan; CBDPC .

Figures

Figure 7. Amphibulus rufithorax Sheng, Li & Sun, sp. nov., ♀, holotype (CBDPC) A habitus, lateral view B head, anterior view C head, dorsal view. Scale bars: 1.0 mm (A); 0.2 mm (B, C).

Figure 8. Amphibulus rufithorax Sheng, Li & Yang, sp. nov., ♀, holotype (CBDPC) A head, dorso-anterior view B mesoscutum and scutellum, dorsal view C mesosoma, lateral view D propodeum E tergite 1, dorsal view F tergite 1, lateral view G tergites 2 - 3, dorsal view H posterior portion of ovipositor, lateral view. Scale bars: 0.3 mm (A); 0.2 mm (B-H).