Bethylus convexus Wang, He & Chen, 2021

Wang, Chung-Hong, He, Jun-Hua & Chen, Xue-Xin, 2021, Taxonomy of Bethylus (Hymenoptera, Bethylidae) from China with description of nine new species, Zootaxa 4974 (2), pp. 361-382 : 363

Bethylus convexus Wang, He & Chen sp. nov.

Fig. 1

Description. Holotype ( Fig. 1a ). Female. Body length 3.01 mm. Forewing length 1.50 mm.

Color. Body dark castaneous, metasoma castaneous. Mandible castaneous.Antenna yellow to yellowish-brown, scape castaneous basally. Legs castaneous, tibiae apically and tarsi yellow. Forewing hyaline tinged with yellow; veins and pterostigma light castaneous.

Pubescence. Body with sparse setae, denser in ventral surface of propleuron and mesopectus. Antenna with dense appressed setae. Forewing with dense setae.

Head ( Fig. 1 b-e). Head longer than wide, LH 1.24 × WH. Mandible with four apical teeth; upper most one with margin truncated. Median clypeal lobe distinctly protuberant with apex rounded; median clypeal carina developed, slightly extending posterad into frons. Antennomeres II-VI in ratio of 1.02:0.88:0.95:1.04:1.0 in length and respectively 1.87, 1.89, 1.53, 1.57, 1.67 × width; antennal scrobal carina absent. Frons coriaceous with punctures separate 1.0–2.0 × their diameter. WF 1.27 × LE; LE 0.95 × DEV. Frontal angle of ocellar triangle acute; POL 1.30 × AOL; OOL 1.83 × WOT; DPV as long as DAO. Vertex crest slightly outcurved; sides of head posterior to eyes parallel. Occipital carina absent. Malar space narrow, malar line between mandible and eye absent. Gena coriaceous, ventral area of gena coriaceous with shallow sparse punctures separate at least 3.0 × their diameter.

Mesosoma ( Fig. 1 f-g). Pronotum coriaceous, dorsal pronotal area slightly shorter than wide with shallow sparse punctures; posterior margin straight medially. Mesoscutum coriaceous with few punctures; parapsidal signum weak, almost complete; mesoscutum 0.90 × mesoscutellum. Mesoscutellum coriaceous with few punctures as well as pair of pits. Metapostnotum rugulose basally, apical half coriaceous, median polished ridge present; dorsal area of propodeum coriaceous, depressing near lateral marginal carina; lateral marginal carina of metapectal-propodeal disc complete. Propodeal declivity coriaceous. Anterior metapleural area coriaceous, metapleural line with two pits; lateral area of metapectal-propodeal complex coriaceous. Propleuron coriaceous. Mesopectus coriaceous; subalar impression present; mesopleural pit and fovea present but weak.

Forewing ( Fig. 1h ). Rs+M 2 v extremely short, even invisible; 2r-rs&Rs 2 v almost straight with apex rounded curved.

Metasoma. Metasomal terga shiny, weakly coriaceous basally; longitudinal sulcus of first metasomal tergum distinctly exceeding first metasomal spiracle. Metasomal sterna shiny with transverse coriaceous band; first metasomal sternum coriaceous, median longitudinal carina absent.

Male. Unknown.

Type material. Holotype ♀ ( ZJUH), Hebei Province, Zhangjiakou, Xiaowutai Mountain , 20–23.viii.2002, Jingxian Liu, No. 200609398.

Distribution. China (Hebei).

Etymology. The specific name “ convexus ” refers to the distinctly protuberant eyes of this species.

Diagnosis. This species can be distinguished from other species of this genus by having head distinctly longer than wide, median clypeal lobe distinctly protuberant with apex rounded, eyes distinctly protuberant ( Fig. 1b ), and metapostnotum with median polished ridge ( Fig. 1f ).

Figures

FIGURE 1. Bethylus convexus sp. nov. holotype, ♀. a. Habitus lateral; b. Head, frontal view; c. Mandible; d. Antenna; e. Head, lateral view; f. Mesosoma, dorsal view; g. Mesosoma, lateral view; h. Forewing. Scale bars: 0.15 mm.