Zavatilla xuzaifui Zhou & Lelej & Williams & Liu 2018, sp. nov.

Zavatilla xuzaifui Zhou, Lelej et Williams, sp. nov.

(Figs 24, 31–36, 41–45, 52–54, 62, 66, 70)

Diagnosis. MALE. Body black, except metasomal segments 1–3 ferruginous. Tegula blackish-brown. Flagellomere 1 0.76 × flagellomere 2 length. Clypeus with distinct concave area; anterior margin with emargination. Metasomal tergum 2 apically with fringe of oblique pale orange setae and metasomal tergum 3 with wide band of dense golden decumbent setae posteriorly. FEMALE. Scape brownish. Legs ferruginous with brownish tibiae. Flagellomere 1 0.76 × flagellomere 2 length. Dorsal transverse clypeal carina with the two sublateral tubercles larger than the basal median tubercle. Mesonotum with inconspicuous prescutellar row of denticles. Metasomal sternum 1 with strong longitudinal median carina that is emarginated in its basal third. Metasomal tergum 2 with two subcircular spots of golden setae anterad, separated by 0.83 × their diameter. Apical fringe of metasomal tergum 2 composed of golden setae. Pygidial plate wide, carinated laterally, with inconspicuous longitudinal striae in basal two thirds and smooth apically.

Material examined. Holotype, ♂, CHINA: Guangdong, Guangzhou, Shimen Forest Park, 4.VI.2009, Xu Zaifu, No. 2016000141 (SCAU). Paratypes. CHINA: Yunnan, Cheli, Shiguyao, 700 m, 27.IV.1957, 1♂, Wang Shu- yung (ZMMU); Jinpin, 1700 m, 15.V.1956, Huang Ke-zhen et al., 1♀ (ZMMU); Guangdong, Nankun Mountain, 22.V.2010, 1♀, Xu Zai-fu, No. 2016000037 (SCAU); same place, but 2.VII–3. VIII.2005, 1 ♀, Xu Zai-fu, No. 2015000357 (SCAU); Guangdong (without additional data), 199[2], 1♂, Xie Weicai (SYSM); Heishioding, 1.VII.1987, 1♂, Zhang Sheng-xiang, En-105777 (SYSM); Hainan, Jianfengling, 21.IX.1984, 1♂, Lang Jianguo (SYSM); same place, 18.IX.1982, 1♀ (head missing), Ma Jun (SYSM). VIETNAM: Hoa Binh, Yen Thuy District, Lac Thinh, Cuc Phuong National Parc, 20º23'N, 105º34'E, 300 m, 30.IV.2002, 1♂, S. Belokobylskij (ZISP); Ha Son Binh, Nai Chen, forest, 31.X.1990, 1♀, S. Belokobylskij (ZISP); Tuyen Quang, Na Hang [Nature] Res[erve], 16–24. V.1997, 1 ♂, S. Peck (CSCA); Vinh Phu, Tam Dao, 1000 m, forest, 16.XI.1990, 1♀, S. Belokobylskij (ZISP).

Description. Holotype. MALE. Body length 14.6–16.8 mm. Forewing length 14.6 mm.

Head. Frons, vertex and gena densely and coarsely punctate. Mandible bidentate apically, with large basal tooth on outer margin. Clypeus with distinct concave area; anterior margin with emargination. Scape with strong carina beneath. Flagellomere 1 0.76 × flagellomere 2 length. POL:OOL:OL:DO=21:39:11:18.

Mesosoma. Pronotum, mesoscutum, and mesoscutellum densely and coarsely punctate. Mesoscutum with distinct notauli, parapsidal furrows, and median line. Notauli almost touching anterior margin of mesoscutum. Parapsidal furrows more inconspicuous and shorter than notauli, half length of mesoscutum. Tegula smooth and shiny, curved posteriorly. Mesoscutellum evenly gibbous. Mesopleuron densely and coarsely punctate. Metapleuron with upper part very finely punctate, lower part densely and coarsely punctate. Meso- and metatibiae without preapical dorsal or lateral spines. Pro-, meso- and metatibiae with strong tibial spurs. Propodeum conspicuously rugose dorsally, densely and coarsely punctate posteriorly and laterally. Forewing with first submarginal cell large, 0.89 × marginal cell length. Distance between origin of RS1 on SC and pterostigma 0.60 × pterostigma length.

Metasoma. Metasoma moderately punctate. Sternum 1 with strong longitudinal median carina anteriorly; median carina 0.5 × metasomal sternum 1 length in profile; distinctly humped posteriorly. Sternum 2 with longitudinal median carina anteriorly; median carina 0.33 × metasomal sternum 2 length in profile. Felt line on metasomal tergum 2 3.2 × length of that on metasomal sternum 2. Metasomal terga 1–7 with very narrow shiny, smooth and impunctate longitudinal area medially. Sternum 8 simple, without ridge or tubercle.

Coloration and pubescence. Head and mesosoma black. Tegula blackish-brown. Wings subhyaline and brownish. Legs black. Metasomal segments 1–3 ferruginous, with median part of metasomal sternum 3 black. Metasomal segments 4–8 black. Mandible, scape, frons, gena, and vertex with yellowish-brown oblique setae. Pronotum and mesopleuron with yellowish-brown decumbent setae (posterior margin of pronotum densely fringed). Mesoscutum with yellowish-brown oblique setae. Mesoscutellum and metanotum with yellowish-brown erect setae. Legs with yellowish-brown oblique setae; setae on tibiae and tarsi denser than that on femora. Propodeum with yellowish-brown oblique setae. Metasomal segments 1–2 with yellowish oblique setae, densely fringed posteriorly on each segment. Metasomal tergum 3 with wide fascia of dense golden decumbent setae posteriorly. Sternum 3 with yellowish oblique setae. Metasomal segment 4 with mixed brown and black oblique setae. Metasomal segments 5–8 with oblique black setae.

FEMALE. Body length 10.0–11.4 mm. Ratio of head width and mesosoma width 55:52. Ratio of mesosoma length to its width 25:17.

Head. Frons, vertex, gena densely and coarsely punctate. Mandible without subapical tooth. Clypeus smooth and shiny, with two sublateral tubercles which larger than clypeal basal median one; concave anteriorly, elevated posteriorly. Scape without distinct carina. Flagellomere 1 length 1.3–1.4 × width and 1.6–1.7 × flagellomere 2 length.

Mesosoma. Dorsum of mesosoma densely and coarsely punctate. Ratio of width of humeral angle, widest point of dorsum, anterior spiracle, propodeal spiracle and widest point of propodeum 31:35:33:29:36. Protibia without spines, meso- and metatibia with two rows of five spines. Metatibio-tarsal ratio 26.0:10.0:7.50:5.0:3.0:4.0. Scutellar scale wide, with inconspicuous prescutellar row of denticles.

Metasoma. Terga 1–2 moderately sparsely punctate. Sternum 1 with strong longitudinal median carina which emarginated in basal third, 0.75 × metasomal sternum 1 length in profile; with two distinct humps. Sternum 2 with longitudinal median carina anteriorly which 0.40 × metasomal sternum 2 length in profile. Sternum 2 shiny, moderately punctate. Segment 3–6 with small dense, more or less confluent punctures. Metasomal tergum 2 with felt line almost one third of metasomal tergum length. Pygidial plate wide, carinated laterally, with inconspicuous longitudinal striae in basal two thirds and smooth apically.

Coloration and pubescence. Head black. Antenna black, with scape, pedicel, flagellomere 1, some flagellomeres ventrally brownish-red. Mandible brownish-red, black apically. Mesosoma ferruginous, legs ferruginous with brownish tibiae. Metasoma black. Scape, clypeus and mandible with yellowish-brown setae. Frons, vertex, and gena with short dark oblique setae, mixed with sparse erect whitish setae. Dorsum of mesosoma with short yellowish-brown oblique setae. Mesopleuron below with silver pubescence mixed with few long erect whitish setae. Propodeum laterally with whitish short pubescence mixed with sparse erect setae, dorsally with long erect yellowish setae. Femur and tibia with sparse erect setae, coxa ventrally and tarsus with dense decumbent yellowish setae. Metasomal segment 1 and metasomal sternum 2 with long yellowish setae, sterna 2–6 posteriorly each with fringe of dense golden setae. Metasomal tergum 2 with two subcircular spots of golden setae anterad, separated by 0.83 × their diameter, and fringe of golden setae posterad. Metasomal tergum 3 with non-interrupted band of golden decumbent setae. Terga 4–5 with mixed decumbent black and yellowish setae.

Distribution. China (Guangdong, Yunnan), Vietnam.

Remarks. The male of this new species is similar to that of Z. flavotegulata (Chen, 1957), but differs from the latter mainly in having metasomal segments 1–3 ferruginous (metasoma wholly black in Z. flavotegulata); the tegula blackish-brown (yellowish-brown in Z. flavotegulata); in having metasomal tergum 2 with a narrow apical fringe of yellow setae (metasomal tergum 2 posterad with distinct band of appressed white setae in Z. flavotegulata); and having flagellomere 1 0.76 × flagellomere 2 length (0.85–0.92 × in Z. flavotegulata).

Etymology. This species is named after the well-known Chinese hymenopterist Prof. Xu Zai-fu (1965–2017), who died suddenly after a serious illness. The holotype of the new species was collected by him.