Bethylus gansensis Wang, He & Chen, 2021

Bethylus gansensis Wang, He & Chen sp. nov.

Fig. 3 View FIGURE 3

Description. Holotype ( Fig. 3a View FIGURE 3 ). Female. Body length 2.55 mm.

Color. Head castaneous; mandible castaneous to dark castaneous, teeth yellow; antenna yellow, darker distad. Mesosoma castaneous; legs yellow, coxae and femora light castaneous; tegula castaneous. Metasoma castaneous to dark castaneous. Forewing hyaline; veins and pterostigma pale yellow.

Pubescence. Sides of head posterior to eyes and vertex crest with long setae; ventral area of gena with sparse setae. Ventral surface of mesosoma with short setae. Forewing with dense short white setae; radial cell and costal cell of forewing without setae.

Head ( Fig. 3 View FIGURE 3 b-e). Head longer than wide, LH 1.14 × WH. Mandible with four apical teeth, upper most with apex truncate. Apex of median clypeal lobe rounded; median clypeal carina slightly extending posterad into frons. Antennomeres II–VI in ratio of 1.14:1.05:1.05:1.08:1.0 in length and 1.83, 1.74, 1.53, 1.45, 1.43, 1.87 × width respectively; antennal scrobal carina absent. Frons coriaceous with punctures separate 1.0–4.0 × their diameter; WF 1.01 × LE. LE 1.51 × DEV. Frontal angle of ocellar triangle obtuse; POL 1.46 × AOL; OOL 1.21 × WOT; DPV 0.25 × DAO. Vertex coriaceous with punctures; vertex crest slightly outcurved. Sides of head posterior to eyes rounded. Occipital carina absent. Malar space narrow, malar line between mandible and eye absent. Gena coriaceous.

Mesosoma ( Fig. 3 View FIGURE 3 f-g). Dorsal pronotal area coriaceous with shallow punctures; lateral margin not carinate, posterior margin curved; lateral pronotal area coriaceous. Mesoscutum coriaceous with shallow sparse punctures; parapsidal signum complete. Mesoscutellum coriaceous with few shallow punctures. Metapostnotum imbricate and depressed, median ridge weakly coriaceous, lateral and median carina absent; dorsal area of propodeum rugulose and elevated; lateral marginal carina incomplete, absent near transverse anterior carina of metapectal-propodeal disc; propodeal declivity coriaceous; anterior metapleural area coriaceous, metapleural line with three pits; lateral surface of metapectal-propodeal complex coriaceous. Propleuron coriaceous. Mesopectus coriaceous; mesopleural fovea and mesopleural pit developed.

Forewing ( Fig. 3h View FIGURE 3 ). Rs+M 2 v absent; Rs 2 v 1.87 × M 2 v; 2r-rs&Rs 2 v rounded arched apically.

Metasoma. Metasomal terga shiny with shallow tiny punctures; longitudinal sulcus of first metasomal tergum present, almost 0.5 × length of first metasomal tergum. Metasomal sterna shiny with shallow tiny punctures.

Male. Unknown.

Variation. Body length: 2.55–2.77 mm. LH 1.14–1.16 × WH; WF 1.01–1.03 × LE; LE 1.49–1.51 × DEV; POL 1.46–1.62 × AOL; OOL 1.21–1.26 × WOT; DPV 0.25–0.41 × DAO.

Type material. Holotype ♀ ( ZJUH), China, Gansu Province, Dangchang Country, Daheba , 104°44′14″E, 33°43′59″N, 2530m, 31.vii.2004, Xuexin Chen, No. 20047039 GoogleMaps . Paratype: ♀ ( ZJUH), China, Gansu Province, Dangchang Country, Daheba , 104°44′14″E, 33°43′59″N, 2530m, 31.vii.2004, Xuexin Chen, No. 20046995 GoogleMaps .

Distribution. China ( Gansu).

Etymology. This species is named based on the type specimen locality.

Diagnosis. This species can be distinguished from other species of this genus by having LH at least 1.14 × WH, DPV shorter than DAO, and frontal angle of ocellar triangle obtuse ( Fig. 3b View FIGURE 3 ).