Quadrastichus flavomaculatus, Li & Li, 2023

Li, Wen-Jian & Li, Cheng-De, 2023, Three new species of Quadrastichus Girault (Hymenoptera, Eulophidae) from China with a key to Chinese species, ZooKeys 1187, pp. 169-188 : 169

Quadrastichus flavomaculatus sp. nov.

Figs 11-16 , 17-18

Type material.

Holotype, female [on card], China, Shaanxi Province, Ankang City, 5.VIII.2015, Ye Chen, Chao Zhang, by sweeping (deposited in YCTU). Paratypes: 4 females. [1 female on slide and 1 female on card], same data as holotype; [1 female on slide], China, Liaoning Province, Anshan City, 20.IX.2015, Hui Geng, Yan Gao, Xin-Yu Zhang, by sweeping; [1 female on slide], CHINA, Jilin Province, Mt. Changbai Shan, 6.VII.2012, Si-Zhu Liu, Jiang Liu, by sweeping. All paratypes are deposited in NEFU.

Diagnosis.

Female. Gaster with a yellow spot at base dorsally (Figs 17 , 18 ). Frons with a median line. Antenna slender with pedicel distinctly shorter than each funicle segment. Mid lobe of mesoscutum with median line distinct. Propodeum with median carina and paraspiracular carinae distinct. Male. Unknown.

Quadrastichus flavomaculatus is similar to Q. anysis (Walker), but can be separated from this species by the following combination of characters: pedicel distinctly shorter than F1 (vs as long as); each funicle segment more than 2.5 × as long as broad (vs 2.0-2.2 ×); mid lobe of mesoscutum with a distinct median line (vs weak or absent); gaster 2.7-3.4 × as long as broad (vs 1.2-1.8 ×).

Description.

Female. Body (Figs 17 , 18 ) length 1.4-1.8 mm (1.7 mm). Head dark brown, eyes reddish-white, ocelli white. Antenna with scape mainly yellow, dorsal part yellowish-brown, pedicel and flagellum yellowish-brown. Mesosoma dark brown; legs yellow except brown base of metacoxae. Wings hyaline, venation yellow. Metasoma brown with a yellow spot at base of gaster extending from first to third tergite (Fig. 18 ).

Head (Fig. 11 ) in dorsal view as broad as mesosoma, 3.2-3.5 × (3.2 ×) as broad as long. Vertex with short setae, the longest seta slightly shorter than OD. Face depressed; frons with a distinct median line; POL 1.8-2.0 × (2.0 ×) OOL, OOL 1.9-2.0 × (1.9 ×) OD. Malar sulcus slightly curved; malar space 0.55 × as long as an eye; mouth opening 1.3 × as wide as malar space. Anterior margin of clypeus bidentate, mandibles tridentate. Lower edge of antennal toruli situated above level of ventral edge of eyes. Antenna (Fig. 12 ) with scape as long as an eye, reaching but not extending above vertex, 4.0-4.4 × (4.2 ×) as long as broad; 2 anelli; pedicel distinctly shorter than each funicle segment, 2.0-2.2 × (2.2 ×) as long as broad; funicle slender, F1-F3 equal in length, F3 slightly broader than F1 and F2, F1-F3: 3.0-3.2 × (3.2 ×), 2.8-3.2 × (3.2 ×) and 2.6-2.8 × (2.6 ×) as long as broad respectively; clava slightly shorter than or as long as F2 and F3 combined, 4.5-5.5 × (5.0 ×) as long as broad, terminal spine shorter than C3, flagellum with numerous short setae.

Mesosoma (Fig. 13 ) 1.3-1.5 × (1.4 ×) as long as broad. Pronotum short, arched. Mid lobe of mesoscutum 1.2 × as broad as long, median line distinct and complete, with 1 adnotaular seta on each side situated in posterior half, reticulation fine. Scutellum 1.4 × as broad as long; anterior pair of setae situated a little behind middle; sublateral grooves distinct, submedian grooves narrow posteriorly, distance between submedian grooves 1.2-1.8 × as broad as distance between submedian grooves and sublateral grooves, reticulation fine. Dorsellum about 2.6 × as broad as long. Propodeum medially slightly longer than dorsellum, reticulation distinct and dense; median carina and paraspiracular carinae distinct; spiracles round, almost touching hind margin of metanotum; callus with 2 setae. Fore wing (Fig. 14 ) 2.1-2.2 × (2.1 ×) as long as broad, costal cell narrow, shorter than MV; MV 3.0-3.2 × (3.0 ×) STV; SMV with 1 dorsal seta; speculum present and small, not extending below MV; marginal setae short. Hind wing (Fig. 14 ) 5.0 × as long as broad. Legs (Fig. 15 ) with meso- and metabasitarsus as long as the corresponding second tarsomere, metafemora 4.3-4.6 × (4.6 ×) as long as broad.

Gastral petiole (Fig. 16 ) transverse. Gaster (Fig. 16 ) lanceolate, 2.5-3.5 × (2.5 ×) as long as broad, distinctly longer than mesosoma, 1.2-1.4 × (1.4 ×) the combined length of head and mesosoma; each tergite with long erect setae on dorsal side; each cercus with 3 setae, the longest seta about 2 × as long as next longest seta; ovipositor 0.8 × as long as length of gaster, ovipositor sheaths extending slightly beyond the tip of gaster; tip of hypopygium situated at anterior 1/3 of gaster.

Male. Unknown.

Host.

Unknown.

Distribution.

China (Jilin, Liaoning, Shaanxi).

Etymology.

The epithet Quadrastichus flavomaculatus refers to the yellow spot at the base of the gaster.

Figures

Figures 11 - 16. Quadrastichus flavomaculatus sp. nov., paratype, female 11 head, frontal view 12 antenna, lateral view 13 mesosoma, dorsal view 14 fore and hind wings, dorsal view 15 legs, lateral view, from left to right: fore, mid, and hind legs 16 metasoma, ventral view. Scale bars: 100 μm.

Figures 17, 18. Quadrastichus flavomaculatus sp. nov., holotype, female 17 habitus, lateral view 18 habitus, dorsallateral view. Scale bars: 500 μm.