Sulcomesitius latibilobatus, Wang & He & Chen, 2024

Wang, Chunhong, He, Junhua & Chen, Xuexin, 2024, Revision of subfamily Mesitiinae (Hymenoptera, Bethylidae) from China, European Journal of Taxonomy 960 (1), pp. 1-61 : 38-41

Sulcomesitius latibilobatus sp. nov.

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Fig. 13

Diagnosis

This new species can be recognized by its having the median pronotal sulcus present and not distinctly foveolate, the median mesonotal sulcus of the mesoscutum absent, the apex of the PPP acute in lateral view and the hypopygium of the male with the anterior margin broad and the posterior branches long and lobose.

This species can be separated from other species of the genus Sulcomesitius by having the antenna with short proclinate setae; dorsal pronotal area with anterolateral corner weakly projected; median mesonotal sulcus of mesoscutum absent; hypopygium with posterior branches wider than median notch.

Etymology

The specific epithet is a combination of ‘ latus ’ (Latin for ‘wide’) and ‘ bilobatus ’ (Latin for ‘bilobed’) because both posterior branches of the hypopygium are wider than its posterior median notch.

Material examined

Holotype

CHINA – Yunnan • ♂; Yingjiang, Tongbiguan ; 23 Jun. 2005; Jingxian Liu leg.; ZJUH 200609145 .

Description

Male

MEASUREMENTS. Body length 4.4 mm. Fore wing length 2.8 mm.

COLOURATION. Body black. Mandible brown, apical half yellowish brown, teeth brown; maxillary and labial palpi yellowish brown. Antenna brown, yellowish brown ventrally. Fore wing light brown, veins brown or yellowish brown, pterostigma yellowish brown. Legs brown, trochanters, tibiae apically and tarsi yellowish brown. T1 partly dark brown, lateral and posterior margin of T2 dark brown, T3–4 brown with black basally, T5–6 brown; S1 black, S2–4 brown posteriorly, S5–6 brown.

PUBESCENCE. Body with short setae. Maxillary palp and labial palp with dense, short setae. Antenna with short, proclinate setae, 0.25 × width of flagellomere II ( Fig. 13C ). Eye with sparse short setae, nearly 4.0× diameter of an ommatidium. Wings with short, dense yellowish-brown setae. Setae of metasoma longer than setae of head and mesosoma, T1 with sparse setae posterolaterally, T2 with basal triangular area glabrous.

HEAD. Length equal to width, LH 1.0× WH. Clypeus trilobite; medio-clypeal lobe with apical margin rounded; medio-clypeal carina not extending into frons, arched in lateral view. Antenna slender, length of flagellomere III 1.85 × length of flagellomere II. Frons coriaceous and densely foveolate ( Fig. 13B ); LE 0.42 × LH, WF 1.31 × LE. Contour of eye distinctly protruding in antero-dorsal view ( Fig. 13B ); LE 1.46× DEV. Anterior ocellus partly anterior to imaginary top line of eyes; POL 1.36 × AOL, OOL 0.94× WOT, DPV 1.38 × DAO. Vertex coriaceous and densely foveolate, sides of head behind eyes rounded and slightly converging posteriorly, vertex crest slightly protruding. Malar space 1.0× distance between posterior ocelli and vertex crest. Gena coriaceous, densely foveolate, with shallow foveolae ventrally. Occipital carina complete, occiput coriaceous with shallow punctures. Medioccipito-genal suture present.

MESOSOMA. Dorsal pronotal area coriaceous and densely foveolate, median length 0.36 × width along posterior pronotal margin, anterolateral corner weakly projected; median pronotal sulcus present ( Fig. 13D ); lateral pronotal area obliquely strigate; cervical pronotal area coarse. Mesoscutum elevated, coriaceous with shallow punctures; median mesonotal sulcus absent ( Fig. 13E ); notauli complete and converging posteriorly, parapsidal signum shallow and absent near anterior margin. Mesoscutellum weakly coriaceous with shallow punctures, apical two-thirds foveolate; mesoscutum-mesoscutellar sulcus present, laterally dilated ( Fig. 13E ). Median length of dorsal surface of MPC 0.95 × its half-width; metapostnotum strongly areolate, metapostnotal median carina complete, metapostnotal-propodeal carina complete and converging posteriorly; dorsal propodeal area transversely striate; paraspiracular and lateral marginal carinae of MPC complete; length of PPP 0.29× median length of dorsal surface of MPC ( Fig. 13E ); transverse posterior carina of MPC complete; propodeal declivity weakly areolate, median and lateral carinae complete; anterior metapleural area transversely striate; lateral surface of MPC with submarginal carina and posterior carina, anterior half of lateral surface of MPC transversely striate, posterior half of lateral surface of MPC areolate. Propleuron coriaceous, foveolate near procoxa, propleural epicoxal sulcus present. Mesopleuron coriaceous and densely foveolate; subalar impression weak; posterior oblique sulcus of mesopleuron present and foveolate; postepicnemial sulcus present; ventral surface of mesopleuron coriaceous with punctures, area between mesocoxa with large foveola; anterior mesofurcal pit present.

WINGS. Fore wing with 2r-rs&Rs 2 v slightly curved apically, 0.85 × length of Sc+R 2 v; posterior margin of pterostigma protruding, prestigma absent ( Fig. 13G ); Cu 2 v present as yellowish-brown trace. Hind wing with three distal hamuli, distance between 1 st and 2 nd hamuli longer than distance between 2 nd and 3 rd hamuli.

METASOMA. Metasomal terga shiny with punctures; T1 with tiny sparse punctures, medio-longitudinal sulcus present on basal one-third; T2 with punctures denser than on T1, posterior margin with scattered punctures. Metasomal sterna shiny, with variably sized punctures; S1 irregularly striate, metapostnotal median carina weak. Hypopygium longer than wide; lateral margin of basal part of hypopygium slightly incurved, anterior margin incurved ( Fig. 13H ); posterior branches wider than median notch, 0.41 × length of hypopygium, with long setae apically.

MALE GENITALIA. Harpe bilobate, dorsal harpe S-shaped and longer than ventral harpe ( Fig. 13I ). Cuspis with apical margin incurved ( Fig. 13J ); digitus bent and papillate apically, with setae basally; aedeagus bottle-shaped ( Fig. 13I ).

Female

Unknown.

Distribution

China (Yunnan) ( Fig. 20 ).

Figures

Fig. 13. Sulcomesitius latibilobatus sp. nov., holotype, ♂ (ZJUH 200609145). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum, dorsal view. E. Mesonotum and MPC, dorsal view. F. T2, dorsal view. G. Fore wing. H. Hypopygium. I. Genitalia, dorsal view. J. Genitalia, ventral view. Scale bars: 0.20 mm.

Fig. 20. Distribution map of species of Mestiinae from China.