Bethylus incurvus 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 : 370-373

Bethylus incurvus Wang, He & Chen sp. nov.

Fig. 6

Description. Holotype ( Fig. 6a ). Female. Body length 3.52 mm. Forewing length 2.24 mm.

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

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

Head ( Fig. 6 b-e). Head longer than wide, LH 1.16 × WH. Mandible with four apical teeth; upper most one with apex rounded. Median clypeal lobe developed with apex rounded; median clypeal carina slightly extending posterad into frons. Antennomeres II–VI in ratio of 0.94:0.85:1.02:1.18:1.0 in length and respectively 1.85, 1.67, 1.63, 2.18, 1.96 × width; antennal scrobal carina absent. Frons and vertex coriaceous with punctures separate 1.0–2.0× their own diameter. WF 1.40 × LE; LE 1.0 × DEV. Anterior ocellus far away from eyes; frontal angle of ocellar triangle acute; POL 1.05 × AOL; OOL 2.33 × WOT; DPV 1.50 × DAO. Vertex crest almost straight; sides of head posterior to eyes converging posteriorly. Malar space narrow, malar line between mandible and eye absent. Gena coriaceous, ventral area coriaceous with shallow punctures.

Mesosoma ( Fig. 6 f-g). Pronotum coriaceous; dorsal pronotal area shorter than wide, coriaceous with shallow punctures. Mesoscutum coriaceous with shallow punctures; mesoscutum 0.80× mesoscutellum; parapsidal signum complete. Mesoscutellum coriaceous with shallow punctures; mesoscutellar pits elongated. Metapostnotum rugulose, median ridge weakly coriaceous; dorsal area of propodeum coriaceous; lateral marginal carina of metapectalpropodeal disc complete but weak basally; propodeal declivity coriaceous; anterior metapleural area coriaceous, metapleural line with three pits; lateral surface of metapectal-propodeal complex coriaceous. Propleuron coriaceous. Prosternum coriaceous with a distinct longitudinal sulcus. Mesopectus coriaceous with shallow punctures; mesopleural pit and fovea weak; ventral surface coriaceous with subpleural signum; mesodiscrimen absent.

Forewing ( Fig. 6h ). Rs+M 2 v extremely short; 2r-rs&Rs 2 v slightly rounded with apex abruptly curved.

Metasoma. Metasomal terga weakly coriaceous, shiny apically; median longitudinal sulcus of first metasomal tergum distinctly exceeding first metasomal spiracles. Metasomal sterna weakly coriaceous with tiny punctures; first metasomal sternum rugulose, median longitudinal carina present.

Male. Unknown.

Variation. Body length 3.26–3.73 mm. Length of forewing: 1.94–2.28 mm. LH 1.11–1.19 × WH; WF 1.13– 1.48 × LE; LE 0.95–1.02 × DEV; POL 1.05–1.27 × AOL; OOL 2.23–2.81 × WOT; DPV 1.12–1.53 × DAO.

Type material. Holotype ♀ ( ZJUH), China, Ningxia, Liupan Mountain , 106°20′12″E, 35°39′31″N, 3– 14.vii.2009, Huayan Chen, No. 202016002 . Paratypes: ♀ ( ZJUH), Ningxia, Jingyuan, Erlong River , 3.vii.2008, Jiemin Yao, No. 200808482 ; ♀ ( ZJUH), Ningxia, Liupan Mountain , 106°20′12″E, 35°39′31″N, 3–14.vii.2009, Huayan Chen, No. 202016003 ; ♀ ( ZJUH), Ningxia, Liupan Mountain , 106°20′12″E, 35°39′31″N, 3–14.vii.2009, Huayan Chen, No. 202016005 .

Distribution. China (Ningxia).

Etymology. The specific name “ incurvus ” refers to median clypeal carina incurved in lateral view.

Diagnosis. This species can be distinguished from other species of this genus by having LH at least 1.15 × WH, apex of median clypeal lobe distinctly protuberant with apex rounded ( Fig. 6b ), and median clypeal carina incurved in lateral view ( Fig. 6e ).

Figures

FIGURE 6. Bethylus incurvus 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.