Bethylus quadraticapitis 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 : 377

Bethylus quadraticapitis Wang, He & Chen sp. nov.

Fig. 9

Description. Holotype ( Fig. 9a ). Male. Body length 3.51 mm. Forewing length 2.42 mm.

Color. Body black, metasoma castaneous. Mandible yellow. Antenna yellow. Legs castaneous, trochanters, tarsi and protibia yellow. Forewing hyaline tinged with yellow; veins light castaneous; pterostigma castaneous.

Pubescence. Body with sparse setae, denser in propleuron, mesopectus ventrally and legs. Antenna with dense appressed setae. Forewing with short dense setae.

Head ( Fig. 9b–e ). Head slightly longer than wide, LH 1.04 × WH. Mandible with four teeth; upper most one with apex straight. Median clypeal lobe with apex straight; median clypeal carina slightly extending posterad into frons. Antennomeres II–VI in ratio of 1.13: 0.91: 1.07: 1.06:1.0 in length and respectively 2.45, 1.92, 2.13, 2.07, 2.26 × width; antennal scrobal carina absent. Frons and vertex coriaceous with shallow sparse punctures. WF 1.68 × LE; LE 0.92 × DEV. Anterior ocellus far away from eyes; frontal angle of ocellar triangle acute; POL 1.12 × AOL; OOL 2.16 × WOT; DPV 2.47 × DAO. Vertex crest straight; sides of head posterior to eyes almost parallel. Malar space narrow, malar line between mandible and eye absent. Gena coriaceous, ventral area coriaceous and elevated with punctures less than frons.

Mesosoma ( Fig. 9 f-g). Pronotum coriaceous; dorsal pronotal area shorter than wide with shallow punctures. Mesoscutum coriaceous with shallow punctures; mesoscutum 0.96 × mesoscutellum; parapsidal signum complete. Mesoscutellum coriaceous with shallow punctures; mesoscutellar pits almost oval. Metapostnotum rugulose, median ridge weakly coriaceous; dorsal area of propodeum rugulose, obliquely rugose near lateral marginal carina; lateral marginal carina of metapectal-propodeal disc weak basally; propodeal declivity coriaceous; anterior metapleural area coriaceous, metapleural line with two pits; lateral surface of metapectal-propodeal complex coriaceous. Propleuron coriaceous. Mesopectus coriaceous with shallow punctures; mesopleural pit and fovea weak.

Forewing ( Fig. 9h ). Rs+M 2 v short, longer than the width of Rs 2 v; 2r-rs&Rs 2 v with apex rounded curved.

Metasoma. Metasomal terga shiny, weakly coriaceous basally; median longitudinal carina of first metasomal tergum not exceeding first metasomal spiracle. Metasomal sterna weakly coriaceous; basal half of first metasomal sternum rugulose, apical half coriaceous, median longitudinal carina present at basal half; hypopygium bilobate with median notch deep and narrow ( Fig. 9i ). Genitalia ( Fig. 9j–k ): ventral arm of paramere with long setae, apex of dorsal arm obtuse; margin of cuspis distinctly rounded in ventral view with long setae; digitus sickle-shaped and papillate dorsally; aedeagus bottle-shaped

Female. Unknown.

Type material. Holotype ♂ ( ZJUH), China, Ningxia, Liupan Mountain , 106°20′14″E, 35°30′15″N, 3– 14.vii.2009, Huayan Chen, No. 202016014.

Distribution. China (Ningxia).

Etymology. The specific name “ quadraticapitis ” compounded with two Latin words: “ quadrat ” (square) and “ capitis ” (head) refers to the sides of the head posterior to the eye parallel and the head is almost square.

Diagnosis. This species can be distinguished from other species of this genus by having DPV 2.47 × DAO, notch of hypopygium deep and narrow ( Fig. 9i ), and cuspis rounded with long setae ( Fig. 9k ).

Figures

FIGURE 9. Bethylus quadraticapitis 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; i. The seventh metasomal sternum and Hypopygium, dorsal view; j. Genitalia, dorsal view; k. Genitalia, ventral view. Scale bars: 0.15 mm.