Mesitiinae, Kieffer, 1914

Wang, Chunhong, He, Junhua & Chen, Xuexin, 2024, Revision of subfamily Mesitiinae (Hymenoptera, Bethylidae) from China, European Journal of Taxonomy 960 (1), pp. 1-61 : 4-5

Key to the genera of the subfamily Mesitiinae from China (modified after Azevedo et al. 2018)

1. Female ............................................................................................................................................... 2

– Male .................................................................................................................................................. 3

2. Median mesonotal sulcus well developed on apical half of mesoscutum ( Fig. 12E ); anterior ocellus usually entirely anterior to imaginary top line of eyes in antero-dorsal view ( Fig. 10B ) ............................................................................................... Sulcomesitius Móczár, 1970

– Median mesonotal sulcus absent, mesoscutum broadly impressed in middle of apical half ( Figs 6E , 7E ); anterior ocellus usually crossing imaginary top line of eyes in antero-dorsal view ( Fig. 5B ) ............................................................................................... Heterocoelia Dahlbom, 1854

3. PPP absent ................................................................................................ Metrionotus Móczár, 1970

– PPP present ....................................................................................................................................... 4

4. Posterior margin of hypopygium incurved with branches broad and short, less than 0.3× length of hypopygium ( Figs 3H , 8G , 9H ) ........................................................................................................ 5

– Posterior margin of hypopygium deeply incurved with branches narrow and long, usually more than 0.4 × length of hypopygium ( Figs 11H , 13H , 14H ) .......................................................................... 6

5. Antennal setae long, longer than width of flagellomere ( Figs 8B , 9C ); aedeagus usually with apical sickle process ......................................................................................... Incertosulcus Móczár, 1970

– Antennal setae short, about one-third width of flagellomere ( Fig. 3C ); aedeagus without apical sickle process ................................................................................................. Heterocoelia Dahlbom, 1854

6. Dorsal pronotal area usually with anterolateral corner distinctly projected ( Fig. 16D ); basal part of hypopygium with lateral margin distinctly incurved and posterior branches of hypopygium usually filamentary ( Figs 17I , 18I ) .................................................................... Zimankos Argaman, 2003

– Dorsal pronotal area usually with anterolateral corner weakly projected ( Fig. 11D ); basal part of hypopygium with lateral margin usually parallel and posterior branches of hypopygium lobose ( Fig. 15H ) .............................................................................................. Sulcomesitius Móczár, 1970

Figures

Fig. 12. Sulcomesitius impressus Xu, He & Terayama, 2003, holotype, ♀ (ZJUH 823323). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum, dorsal view. E. Mesonotum, dorsal view. F. MPC, dorsal view. G. T2, dorsal view. H. Fore wing. Scale bars: A, C–H = 0.20 mm; B = 0.15 mm.

Fig. 10. Sulcomesitius angustifrons sp. nov., holotype, ♀ (IZCAS IOZ(E) 2059138). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum, dorsal view. E. MPC, dorsal view. F. T2, dorsal view. G. Fore wing. Scale bars: A, C–G = 0.20 mm; B = 0.25 mm.

Fig. 6. Heterocoelia unicolor sp. nov., holotype, ♀ (IZCAS IOZ(E) 2059143). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum, dorsal view. E. Mesonotum, dorsal view. F. MPC, dorsal view. G. T2, dorsal view. H. Fore wing. Scale bars: A, C–H = 0.20 mm; B = 0.25 mm.

Fig. 7. Heterocoelia varicolor sp. nov., holotype, ♀ (IZCAS IOZ(E) 2059142). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum, dorsal view. E. Mesonotum, dorsal view. F. MPC, dorsal view. G. T2, dorsal view. H. Fore wing. Scale bars: A, C–H = 0.20 mm; B = 0.25 mm.

Fig. 5. Heterocoelia remota sp. nov., holotype, ♀ (IZCAS IOZ(E) 2059129). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Pronotum, dorsal view. D. MPC, dorsal view. E. T2, dorsal view. F. Fore wing. Scale bars: A, C–F = 0.20 mm; B = 0.25 mm.

Fig. 3. Heterocoelia neomoczari (Barbosa & Azevedo, 2018), holotype, ♂ (ZJUH 958428). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum and mesonotum, dorsal view. E. MPC, dorsal view. F. T2, dorsal view. G. Fore wing. H. Hypopygium. I. Genitalia, dorsal view. J. Genitalia, ventral view. Scale bars: A, C–J = 0.20 mm; B = 0.10 mm.

Fig. 8. Incertosulcus afoveatus sp. nov., holotype, ♂ (ZJUH 200609178). A. Head, antero-dorsal view. B. Antenna. C. Pronotum and mesonotum, dorsal view. D. MPC, dorsal view. E. T2, dorsal view. F. Fore wing. G. Hypopygium. H. Genitalia, dorsal view. I. Genitalia, ventral view. Scale bars: 0.20 mm.

Fig. 9. Incertosulcus exilisulcus sp. nov., holotype, ♂ (ZJUH 200700110). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum and mesonotum, dorsal view. E. 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. 11. Sulcomesitius breviculus (Xu, He & Terayama, 2003), holotype, ♂ (ZJUH 949066). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum and mesonotum, dorsal view. E. 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. 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. 14. Sulcomesitius sparsulus sp. nov., holotype, ♂ (ZJUH 200800040). 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. 16. Zimankos acutulus sp. nov., holotype, ♂ (ZJUH 200611246). 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. 17. Zimankos cambodianus (Móczár, 1976), ♂ (ZJUH 940245). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum, dorsal view. E. Mesonotum, dorsal view. F. MPC, dorsal view. G. T2, dorsal view. H. Fore wing. I. Hypopygium. J. Genitalia, dorsal view. K. Genitalia, ventral view. Scale bars: 0.20 mm.

Fig. 18. Zimankos hamulosus sp. nov., holotype, ♂ (ZJUH 200801198). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum, dorsal view. E. Mesonotum, dorsal view. F. MPC, dorsal view. G. T2, dorsal view. H. Fore wing. I. Hypopygium. J. Genitalia, dorsal view. K. Genitalia, ventral view. Scale bars: 0.20 mm.

Fig. 15. Sulcomesitius zhaoi (Xu & He, 2006) comb. nov., holotype, ♂ (ZJUH 967700). A. Habitus, lateral view. B. Head, antero-dorsal view. C. Antenna. D. Pronotum and mesoscutum, dorsal view. E. Mesoscutellum 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.